libata-link: introduce ata_link

Introduce ata_link.  It abstracts PHY and sits between ata_port and
ata_device.  This new level of abstraction is necessary to support
SATA Port Multiplier, which basically adds a bunch of links (PHYs) to
a ATA host port.  Fields related to command execution, spd_limit and
EH are per-link and thus moved to ata_link.

This patch only defines the host link.  Multiple link handling will be
added later.  Also, a lot of ap->link derefences are added but many of
them will be removed as each part is converted to deal directly with
ata_link instead of ata_port.

This patch introduces no behavior change.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Cc: James Bottomley <James.Bottomley@SteelEye.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

30 files changed, 247 insertions, 232 deletions

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index c16820325d7b..c72fa468a697 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -1064,7 +1064,7 @@ static int ahci_do_softreset(struct ata_port *ap, unsigned int *class,
                 ata_port_printk(ap, KERN_WARNING,
                                 "failed to reset engine (errno=%d)", rc);
 
-        ata_tf_init(ap->device, &tf);
+        ata_tf_init(ap->link.device, &tf);
 
         /* issue the first D2H Register FIS */
         msecs = 0;
@@ -1132,7 +1132,7 @@ static int ahci_hardreset(struct ata_port *ap, unsigned int *class,
         ahci_stop_engine(ap);
 
         /* clear D2H reception area to properly wait for D2H FIS */
-        ata_tf_init(ap->device, &tf);
+        ata_tf_init(ap->link.device, &tf);
         tf.command = 0x80;
         ata_tf_to_fis(&tf, 0, 0, d2h_fis);
 
@@ -1159,7 +1159,7 @@ static int ahci_vt8251_hardreset(struct ata_port *ap, unsigned int *class,
 
         ahci_stop_engine(ap);
 
-        rc = sata_port_hardreset(ap, sata_ehc_deb_timing(&ap->eh_context),
+        rc = sata_port_hardreset(ap, sata_ehc_deb_timing(&ap->link.eh_context),
                                  deadline);
 
         /* vt8251 needs SError cleared for the port to operate */
@@ -1278,7 +1278,7 @@ static void ahci_qc_prep(struct ata_queued_cmd *qc)
 static void ahci_error_intr(struct ata_port *ap, u32 irq_stat)
 {
         struct ahci_port_priv *pp = ap->private_data;
-        struct ata_eh_info *ehi = &ap->eh_info;
+        struct ata_eh_info *ehi = &ap->link.eh_info;
         unsigned int err_mask = 0, action = 0;
         struct ata_queued_cmd *qc;
         u32 serror;
@@ -1332,7 +1332,7 @@ static void ahci_error_intr(struct ata_port *ap, u32 irq_stat)
         ehi->serror |= serror;
         ehi->action |= action;
 
-        qc = ata_qc_from_tag(ap, ap->active_tag);
+        qc = ata_qc_from_tag(ap, ap->link.active_tag);
         if (qc)
                 qc->err_mask |= err_mask;
         else
@@ -1347,7 +1347,7 @@ static void ahci_error_intr(struct ata_port *ap, u32 irq_stat)
 static void ahci_port_intr(struct ata_port *ap)
 {
         void __iomem *port_mmio = ap->ioaddr.cmd_addr;
-        struct ata_eh_info *ehi = &ap->eh_info;
+        struct ata_eh_info *ehi = &ap->link.eh_info;
         struct ahci_port_priv *pp = ap->private_data;
         u32 status, qc_active;
         int rc, known_irq = 0;
@@ -1360,7 +1360,7 @@ static void ahci_port_intr(struct ata_port *ap)
                 return;
         }
 
-        if (ap->sactive)
+        if (ap->link.sactive)
                 qc_active = readl(port_mmio + PORT_SCR_ACT);
         else
                 qc_active = readl(port_mmio + PORT_CMD_ISSUE);
@@ -1380,7 +1380,7 @@ static void ahci_port_intr(struct ata_port *ap)
         /* if !NCQ, ignore.  No modern ATA device has broken HSM
          * implementation for non-NCQ commands.
          */
-        if (!ap->sactive)
+        if (!ap->link.sactive)
                 return;
 
         if (status & PORT_IRQ_D2H_REG_FIS) {
@@ -1433,7 +1433,7 @@ static void ahci_port_intr(struct ata_port *ap)
         if (!known_irq)
                 ata_port_printk(ap, KERN_INFO, "spurious interrupt "
                                 "(irq_stat 0x%x active_tag 0x%x sactive 0x%x)\n",
-                                status, ap->active_tag, ap->sactive);
+                                status, ap->link.active_tag, ap->link.sactive);
 }
 
 static void ahci_irq_clear(struct ata_port *ap)
diff --git a/drivers/ata/ata_generic.c b/drivers/ata/ata_generic.c
index 945466954724..b5e390ff5bd8 100644
--- a/drivers/ata/ata_generic.c
+++ b/drivers/ata/ata_generic.c
@@ -53,7 +53,7 @@ static int generic_set_mode(struct ata_port *ap, struct ata_device **unused)
                 dma_enabled = ioread8(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
 
         for (i = 0; i < ATA_MAX_DEVICES; i++) {
-                struct ata_device *dev = &ap->device[i];
+                struct ata_device *dev = &ap->link.device[i];
                 if (ata_dev_enabled(dev)) {
                         /* We don't really care */
                         dev->pio_mode = XFER_PIO_0;
diff --git a/drivers/ata/libata-acpi.c b/drivers/ata/libata-acpi.c
index c059f78ad944..0023ac4ff496 100644
--- a/drivers/ata/libata-acpi.c
+++ b/drivers/ata/libata-acpi.c
@@ -44,7 +44,8 @@ static void ata_acpi_associate_sata_port(struct ata_port *ap)
 {
         acpi_integer adr = SATA_ADR(ap->port_no, NO_PORT_MULT);
 
-        ap->device->acpi_handle = acpi_get_child(ap->host->acpi_handle, adr);
+        ap->link.device->acpi_handle =
+                acpi_get_child(ap->host->acpi_handle, adr);
 }
 
 static void ata_acpi_associate_ide_port(struct ata_port *ap)
@@ -60,7 +61,7 @@ static void ata_acpi_associate_ide_port(struct ata_port *ap)
                 max_devices++;
 
         for (i = 0; i < max_devices; i++) {
-                struct ata_device *dev = &ap->device[i];
+                struct ata_device *dev = &ap->link.device[i];
 
                 dev->acpi_handle = acpi_get_child(ap->acpi_handle, i);
         }
@@ -182,10 +183,10 @@ static int ata_acpi_stm(const struct ata_port *ap, struct ata_acpi_gtm *stm)
         /* Buffers for id may need byteswapping ? */
         in_params[1].type = ACPI_TYPE_BUFFER;
         in_params[1].buffer.length = 512;
-        in_params[1].buffer.pointer = (u8 *)ap->device[0].id;
+        in_params[1].buffer.pointer = (u8 *)ap->link.device[0].id;
         in_params[2].type = ACPI_TYPE_BUFFER;
         in_params[2].buffer.length = 512;
-        in_params[2].buffer.pointer = (u8 *)ap->device[1].id;
+        in_params[2].buffer.pointer = (u8 *)ap->link.device[1].id;
 
         input.count = 3;
         input.pointer = in_params;
@@ -226,7 +227,7 @@ static int ata_acpi_stm(const struct ata_port *ap, struct ata_acpi_gtm *stm)
 static int ata_dev_get_GTF(struct ata_device *dev, struct ata_acpi_gtf **gtf,
                            void **ptr_to_free)
 {
-        struct ata_port *ap = dev->ap;
+        struct ata_port *ap = dev->link->ap;
         acpi_status status;
         struct acpi_buffer output;
         union acpi_object *out_obj;
@@ -320,7 +321,7 @@ static int ata_dev_get_GTF(struct ata_device *dev, struct ata_acpi_gtf **gtf,
 static int taskfile_load_raw(struct ata_device *dev,
                               const struct ata_acpi_gtf *gtf)
 {
-        struct ata_port *ap = dev->ap;
+        struct ata_port *ap = dev->link->ap;
         struct ata_taskfile tf, rtf;
         unsigned int err_mask;
 
@@ -424,7 +425,7 @@ static int ata_acpi_exec_tfs(struct ata_device *dev)
  */
 static int ata_acpi_push_id(struct ata_device *dev)
 {
-        struct ata_port *ap = dev->ap;
+        struct ata_port *ap = dev->link->ap;
         int err;
         acpi_status status;
         struct acpi_object_list input;
@@ -519,7 +520,7 @@ void ata_acpi_on_resume(struct ata_port *ap)
 
         /* schedule _GTF */
         for (i = 0; i < ATA_MAX_DEVICES; i++)
-                ap->device[i].flags |= ATA_DFLAG_ACPI_PENDING;
+                ap->link.device[i].flags |= ATA_DFLAG_ACPI_PENDING;
 }
 
 /**
@@ -538,8 +539,8 @@ void ata_acpi_on_resume(struct ata_port *ap)
  */
 int ata_acpi_on_devcfg(struct ata_device *dev)
 {
-        struct ata_port *ap = dev->ap;
-        struct ata_eh_context *ehc = &ap->eh_context;
+        struct ata_port *ap = dev->link->ap;
+        struct ata_eh_context *ehc = &ap->link.eh_context;
         int acpi_sata = ap->flags & ATA_FLAG_ACPI_SATA;
         int rc;
 
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 772be09b4689..dd2de485124a 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -235,7 +235,7 @@ static int ata_rwcmd_protocol(struct ata_taskfile *tf, struct ata_device *dev)
         if (dev->flags & ATA_DFLAG_PIO) {
                 tf->protocol = ATA_PROT_PIO;
                 index = dev->multi_count ? 0 : 8;
-        } else if (lba48 && (dev->ap->flags & ATA_FLAG_PIO_LBA48)) {
+        } else if (lba48 && (dev->link->ap->flags & ATA_FLAG_PIO_LBA48)) {
                 /* Unable to use DMA due to host limitation */
                 tf->protocol = ATA_PROT_PIO;
                 index = dev->multi_count ? 0 : 8;
@@ -604,7 +604,7 @@ static const char *sata_spd_string(unsigned int spd)
 void ata_dev_disable(struct ata_device *dev)
 {
         if (ata_dev_enabled(dev)) {
-                if (ata_msg_drv(dev->ap))
+                if (ata_msg_drv(dev->link->ap))
                         ata_dev_printk(dev, KERN_WARNING, "disabled\n");
                 ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO0 |
                                              ATA_DNXFER_QUIET);
@@ -735,7 +735,7 @@ ata_dev_try_classify(struct ata_port *ap, unsigned int device, u8 *r_err)
         /* see if device passed diags: if master then continue and warn later */
         if (err == 0 && device == 0)
                 /* diagnostic fail : do nothing _YET_ */
-                ap->device[device].horkage |= ATA_HORKAGE_DIAGNOSTIC;
+                ap->link.device[device].horkage |= ATA_HORKAGE_DIAGNOSTIC;
         else if (err == 1)
                 /* do nothing */ ;
         else if ((device == 0) && (err == 0x81))
@@ -1150,7 +1150,7 @@ void ata_dev_select(struct ata_port *ap, unsigned int device,
         ap->ops->dev_select(ap, device);
 
         if (wait) {
-                if (can_sleep && ap->device[device].class == ATA_DEV_ATAPI)
+                if (can_sleep && ap->link.device[device].class == ATA_DEV_ATAPI)
                         msleep(150);
                 ata_wait_idle(ap);
         }
@@ -1346,7 +1346,8 @@ unsigned ata_exec_internal_sg(struct ata_device *dev,
                               int dma_dir, struct scatterlist *sg,
                               unsigned int n_elem)
 {
-        struct ata_port *ap = dev->ap;
+        struct ata_link *link = dev->link;
+        struct ata_port *ap = link->ap;
         u8 command = tf->command;
         struct ata_queued_cmd *qc;
         unsigned int tag, preempted_tag;
@@ -1386,11 +1387,11 @@ unsigned ata_exec_internal_sg(struct ata_device *dev,
         qc->dev = dev;
         ata_qc_reinit(qc);
 
-        preempted_tag = ap->active_tag;
-        preempted_sactive = ap->sactive;
+        preempted_tag = link->active_tag;
+        preempted_sactive = link->sactive;
         preempted_qc_active = ap->qc_active;
-        ap->active_tag = ATA_TAG_POISON;
-        ap->sactive = 0;
+        link->active_tag = ATA_TAG_POISON;
+        link->sactive = 0;
         ap->qc_active = 0;
 
         /* prepare & issue qc */
@@ -1467,8 +1468,8 @@ unsigned ata_exec_internal_sg(struct ata_device *dev,
         err_mask = qc->err_mask;
 
         ata_qc_free(qc);
-        ap->active_tag = preempted_tag;
-        ap->sactive = preempted_sactive;
+        link->active_tag = preempted_tag;
+        link->sactive = preempted_sactive;
         ap->qc_active = preempted_qc_active;
 
         /* XXX - Some LLDDs (sata_mv) disable port on command failure.
@@ -1566,7 +1567,7 @@ unsigned int ata_pio_need_iordy(const struct ata_device *adev)
 {
         /* Controller doesn't support  IORDY. Probably a pointless check
            as the caller should know this */
-        if (adev->ap->flags & ATA_FLAG_NO_IORDY)
+        if (adev->link->ap->flags & ATA_FLAG_NO_IORDY)
                 return 0;
         /* PIO3 and higher it is mandatory */
         if (adev->pio_mode > XFER_PIO_2)
@@ -1622,7 +1623,7 @@ static u32 ata_pio_mask_no_iordy(const struct ata_device *adev)
 int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
                     unsigned int flags, u16 *id)
 {
-        struct ata_port *ap = dev->ap;
+        struct ata_port *ap = dev->link->ap;
         unsigned int class = *p_class;
         struct ata_taskfile tf;
         unsigned int err_mask = 0;
@@ -1774,13 +1775,14 @@ int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
 
 static inline u8 ata_dev_knobble(struct ata_device *dev)
 {
-        return ((dev->ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
+        struct ata_port *ap = dev->link->ap;
+        return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
 }
 
 static void ata_dev_config_ncq(struct ata_device *dev,
                                char *desc, size_t desc_sz)
 {
-        struct ata_port *ap = dev->ap;
+        struct ata_port *ap = dev->link->ap;
         int hdepth = 0, ddepth = ata_id_queue_depth(dev->id);
 
         if (!ata_id_has_ncq(dev->id)) {
@@ -1817,8 +1819,8 @@ static void ata_dev_config_ncq(struct ata_device *dev,
  */
 int ata_dev_configure(struct ata_device *dev)
 {
-        struct ata_port *ap = dev->ap;
-        struct ata_eh_context *ehc = &ap->eh_context;
+        struct ata_port *ap = dev->link->ap;
+        struct ata_eh_context *ehc = &dev->link->eh_context;
         int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
         const u16 *id = dev->id;
         unsigned int xfer_mask;
@@ -2116,7 +2118,7 @@ int ata_bus_probe(struct ata_port *ap)
         ap->ops->phy_reset(ap);
 
         for (i = 0; i < ATA_MAX_DEVICES; i++) {
-                dev = &ap->device[i];
+                dev = &ap->link.device[i];
 
                 if (!(ap->flags & ATA_FLAG_DISABLED) &&
                     dev->class != ATA_DEV_UNKNOWN)
@@ -2133,14 +2135,14 @@ int ata_bus_probe(struct ata_port *ap)
            state is undefined. Record the mode */
 
         for (i = 0; i < ATA_MAX_DEVICES; i++)
-                ap->device[i].pio_mode = XFER_PIO_0;
+                ap->link.device[i].pio_mode = XFER_PIO_0;
 
         /* read IDENTIFY page and configure devices. We have to do the identify
            specific sequence bass-ackwards so that PDIAG- is released by
            the slave device */
 
         for (i = ATA_MAX_DEVICES - 1; i >=  0; i--) {
-                dev = &ap->device[i];
+                dev = &ap->link.device[i];
 
                 if (tries[i])
                         dev->class = classes[i];
@@ -2162,13 +2164,13 @@ int ata_bus_probe(struct ata_port *ap)
            this in the normal order so that the user doesn't get confused */
 
         for(i = 0; i < ATA_MAX_DEVICES; i++) {
-                dev = &ap->device[i];
+                dev = &ap->link.device[i];
                 if (!ata_dev_enabled(dev))
                         continue;
 
-                ap->eh_context.i.flags |= ATA_EHI_PRINTINFO;
+                ap->link.eh_context.i.flags |= ATA_EHI_PRINTINFO;
                 rc = ata_dev_configure(dev);
-                ap->eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
+                ap->link.eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
                 if (rc)
                         goto fail;
         }
@@ -2179,7 +2181,7 @@ int ata_bus_probe(struct ata_port *ap)
                 goto fail;
 
         for (i = 0; i < ATA_MAX_DEVICES; i++)
-                if (ata_dev_enabled(&ap->device[i]))
+                if (ata_dev_enabled(&ap->link.device[i]))
                         return 0;
 
         /* no device present, disable port */
@@ -2344,8 +2346,8 @@ void sata_phy_reset(struct ata_port *ap)
 
 struct ata_device *ata_dev_pair(struct ata_device *adev)
 {
-        struct ata_port *ap = adev->ap;
-        struct ata_device *pair = &ap->device[1 - adev->devno];
+        struct ata_link *link = adev->link;
+        struct ata_device *pair = &link->device[1 - adev->devno];
         if (!ata_dev_enabled(pair))
                 return NULL;
         return pair;
@@ -2366,8 +2368,8 @@ struct ata_device *ata_dev_pair(struct ata_device *adev)
 
 void ata_port_disable(struct ata_port *ap)
 {
-        ap->device[0].class = ATA_DEV_NONE;
-        ap->device[1].class = ATA_DEV_NONE;
+        ap->link.device[0].class = ATA_DEV_NONE;
+        ap->link.device[1].class = ATA_DEV_NONE;
         ap->flags |= ATA_FLAG_DISABLED;
 }
 
@@ -2400,9 +2402,9 @@ int sata_down_spd_limit(struct ata_port *ap)
         if (rc == 0)
                 spd = (sstatus >> 4) & 0xf;
         else
-                spd = ap->sata_spd;
+                spd = ap->link.sata_spd;
 
-        mask = ap->sata_spd_limit;
+        mask = ap->link.sata_spd_limit;
         if (mask <= 1)
                 return -EINVAL;
 
@@ -2422,7 +2424,7 @@ int sata_down_spd_limit(struct ata_port *ap)
         if (!mask)
                 return -EINVAL;
 
-        ap->sata_spd_limit = mask;
+        ap->link.sata_spd_limit = mask;
 
         ata_port_printk(ap, KERN_WARNING, "limiting SATA link speed to %s\n",
                         sata_spd_string(fls(mask)));
@@ -2434,10 +2436,10 @@ static int __sata_set_spd_needed(struct ata_port *ap, u32 *scontrol)
 {
         u32 spd, limit;
 
-        if (ap->sata_spd_limit == UINT_MAX)
+        if (ap->link.sata_spd_limit == UINT_MAX)
                 limit = 0;
         else
-                limit = fls(ap->sata_spd_limit);
+                limit = fls(ap->link.sata_spd_limit);
 
         spd = (*scontrol >> 4) & 0xf;
         *scontrol = (*scontrol & ~0xf0) | ((limit & 0xf) << 4);
@@ -2450,7 +2452,7 @@ static int __sata_set_spd_needed(struct ata_port *ap, u32 *scontrol)
  *      @ap: Port in question
  *
  *      Test whether the spd limit in SControl matches
- *      @ap->sata_spd_limit.  This function is used to determine
+ *      @ap->link.sata_spd_limit.  This function is used to determine
  *      whether hardreset is necessary to apply SATA spd
  *      configuration.
  *
@@ -2749,7 +2751,7 @@ int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
 
 static int ata_dev_set_mode(struct ata_device *dev)
 {
-        struct ata_eh_context *ehc = &dev->ap->eh_context;
+        struct ata_eh_context *ehc = &dev->link->eh_context;
         unsigned int err_mask;
         int rc;
 
@@ -2809,7 +2811,7 @@ int ata_do_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
         for (i = 0; i < ATA_MAX_DEVICES; i++) {
                 unsigned int pio_mask, dma_mask;
 
-                dev = &ap->device[i];
+                dev = &ap->link.device[i];
 
                 if (!ata_dev_enabled(dev))
                         continue;
@@ -2830,7 +2832,7 @@ int ata_do_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
 
         /* step 2: always set host PIO timings */
         for (i = 0; i < ATA_MAX_DEVICES; i++) {
-                dev = &ap->device[i];
+                dev = &ap->link.device[i];
                 if (!ata_dev_enabled(dev))
                         continue;
 
@@ -2848,7 +2850,7 @@ int ata_do_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
 
         /* step 3: set host DMA timings */
         for (i = 0; i < ATA_MAX_DEVICES; i++) {
-                dev = &ap->device[i];
+                dev = &ap->link.device[i];
 
                 if (!ata_dev_enabled(dev) || !dev->dma_mode)
                         continue;
@@ -2861,7 +2863,7 @@ int ata_do_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
 
         /* step 4: update devices' xfer mode */
         for (i = 0; i < ATA_MAX_DEVICES; i++) {
-                dev = &ap->device[i];
+                dev = &ap->link.device[i];
 
                 /* don't update suspended devices' xfer mode */
                 if (!ata_dev_enabled(dev))
@@ -3142,6 +3144,7 @@ static int ata_bus_softreset(struct ata_port *ap, unsigned int devmask,
 
 void ata_bus_reset(struct ata_port *ap)
 {
+        struct ata_device *device = ap->link.device;
         struct ata_ioports *ioaddr = &ap->ioaddr;
         unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
         u8 err;
@@ -3177,19 +3180,19 @@ void ata_bus_reset(struct ata_port *ap)
         /*
          * determine by signature whether we have ATA or ATAPI devices
          */
-        ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
+        device[0].class = ata_dev_try_classify(ap, 0, &err);
         if ((slave_possible) && (err != 0x81))
-                ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
+                device[1].class = ata_dev_try_classify(ap, 1, &err);
 
         /* is double-select really necessary? */
-        if (ap->device[1].class != ATA_DEV_NONE)
+        if (device[1].class != ATA_DEV_NONE)
                 ap->ops->dev_select(ap, 1);
-        if (ap->device[0].class != ATA_DEV_NONE)
+        if (device[0].class != ATA_DEV_NONE)
                 ap->ops->dev_select(ap, 0);
 
         /* if no devices were detected, disable this port */
-        if ((ap->device[0].class == ATA_DEV_NONE) &&
-            (ap->device[1].class == ATA_DEV_NONE))
+        if ((device[0].class == ATA_DEV_NONE) &&
+            (device[1].class == ATA_DEV_NONE))
                 goto err_out;
 
         if (ap->flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST)) {
@@ -3331,7 +3334,7 @@ int sata_phy_resume(struct ata_port *ap, const unsigned long *params,
  */
 int ata_std_prereset(struct ata_port *ap, unsigned long deadline)
 {
-        struct ata_eh_context *ehc = &ap->eh_context;
+        struct ata_eh_context *ehc = &ap->link.eh_context;
         const unsigned long *timing = sata_ehc_deb_timing(ehc);
         int rc;
 
@@ -3503,7 +3506,7 @@ int sata_port_hardreset(struct ata_port *ap, const unsigned long *timing,
 int sata_std_hardreset(struct ata_port *ap, unsigned int *class,
                        unsigned long deadline)
 {
-        const unsigned long *timing = sata_ehc_deb_timing(&ap->eh_context);
+        const unsigned long *timing = sata_ehc_deb_timing(&ap->link.eh_context);
         int rc;
 
         DPRINTK("ENTER\n");
@@ -3652,7 +3655,7 @@ static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
 int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
 {
         unsigned int class = dev->class;
-        u16 *id = (void *)dev->ap->sector_buf;
+        u16 *id = (void *)dev->link->ap->sector_buf;
         int rc;
 
         /* read ID data */
@@ -3837,7 +3840,7 @@ static int ata_dma_blacklisted(const struct ata_device *dev)
          * DMA blacklist those ATAPI devices with CDB-intr (and use PIO)
          * if the LLDD handles only interrupts in the HSM_ST_LAST state.
          */
-        if ((dev->ap->flags & ATA_FLAG_PIO_POLLING) &&
+        if ((dev->link->ap->flags & ATA_FLAG_PIO_POLLING) &&
             (dev->flags & ATA_DFLAG_CDB_INTR))
                 return 1;
         return (dev->horkage & ATA_HORKAGE_NODMA) ? 1 : 0;
@@ -3857,7 +3860,8 @@ static int ata_dma_blacklisted(const struct ata_device *dev)
  */
 static void ata_dev_xfermask(struct ata_device *dev)
 {
-        struct ata_port *ap = dev->ap;
+        struct ata_link *link = dev->link;
+        struct ata_port *ap = link->ap;
         struct ata_host *host = ap->host;
         unsigned long xfer_mask;
 
@@ -4482,7 +4486,7 @@ void swap_buf_le16(u16 *buf, unsigned int buf_words)
 void ata_data_xfer(struct ata_device *adev, unsigned char *buf,
                    unsigned int buflen, int write_data)
 {
-        struct ata_port *ap = adev->ap;
+        struct ata_port *ap = adev->link->ap;
         unsigned int words = buflen >> 1;
 
         /* Transfer multiple of 2 bytes */
@@ -5188,7 +5192,7 @@ static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
 
 struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
 {
-        struct ata_port *ap = dev->ap;
+        struct ata_port *ap = dev->link->ap;
         struct ata_queued_cmd *qc;
 
         qc = ata_qc_new(ap);
@@ -5231,6 +5235,7 @@ void ata_qc_free(struct ata_queued_cmd *qc)
 void __ata_qc_complete(struct ata_queued_cmd *qc)
 {
         struct ata_port *ap = qc->ap;
+        struct ata_link *link = qc->dev->link;
 
         WARN_ON(qc == NULL);    /* ata_qc_from_tag _might_ return NULL */
         WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
@@ -5240,9 +5245,9 @@ void __ata_qc_complete(struct ata_queued_cmd *qc)
 
         /* command should be marked inactive atomically with qc completion */
         if (qc->tf.protocol == ATA_PROT_NCQ)
-                ap->sactive &= ~(1 << qc->tag);
+                link->sactive &= ~(1 << qc->tag);
         else
-                ap->active_tag = ATA_TAG_POISON;
+                link->active_tag = ATA_TAG_POISON;
 
         /* atapi: mark qc as inactive to prevent the interrupt handler
          * from completing the command twice later, before the error handler
@@ -5411,19 +5416,20 @@ static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
 void ata_qc_issue(struct ata_queued_cmd *qc)
 {
         struct ata_port *ap = qc->ap;
+        struct ata_link *link = qc->dev->link;
 
         /* Make sure only one non-NCQ command is outstanding.  The
          * check is skipped for old EH because it reuses active qc to
          * request ATAPI sense.
          */
-        WARN_ON(ap->ops->error_handler && ata_tag_valid(ap->active_tag));
+        WARN_ON(ap->ops->error_handler && ata_tag_valid(link->active_tag));
 
         if (qc->tf.protocol == ATA_PROT_NCQ) {
-                WARN_ON(ap->sactive & (1 << qc->tag));
-                ap->sactive |= 1 << qc->tag;
+                WARN_ON(link->sactive & (1 << qc->tag));
+                link->sactive |= 1 << qc->tag;
         } else {
-                WARN_ON(ap->sactive);
-                ap->active_tag = qc->tag;
+                WARN_ON(link->sactive);
+                link->active_tag = qc->tag;
         }
 
         qc->flags |= ATA_QCFLAG_ACTIVE;
@@ -5606,7 +5612,7 @@ unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
 inline unsigned int ata_host_intr (struct ata_port *ap,
                                    struct ata_queued_cmd *qc)
 {
-        struct ata_eh_info *ehi = &ap->eh_info;
+        struct ata_eh_info *ehi = &ap->link.eh_info;
         u8 status, host_stat = 0;
 
         VPRINTK("ata%u: protocol %d task_state %d\n",
@@ -5721,7 +5727,7 @@ irqreturn_t ata_interrupt (int irq, void *dev_instance)
                     !(ap->flags & ATA_FLAG_DISABLED)) {
                         struct ata_queued_cmd *qc;
 
-                        qc = ata_qc_from_tag(ap, ap->active_tag);
+                        qc = ata_qc_from_tag(ap, ap->link.active_tag);
                         if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
                             (qc->flags & ATA_QCFLAG_ACTIVE))
                                 handled |= ata_host_intr(ap, qc);
@@ -5921,8 +5927,8 @@ static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
                 }
 
                 ap->pflags |= ATA_PFLAG_PM_PENDING;
-                ap->eh_info.action |= action;
-                ap->eh_info.flags |= ehi_flags;
+                ap->link.eh_info.action |= action;
+                ap->link.eh_info.flags |= ehi_flags;
 
                 ata_port_schedule_eh(ap);
 
@@ -6026,12 +6032,13 @@ int ata_port_start(struct ata_port *ap)
  */
 void ata_dev_init(struct ata_device *dev)
 {
-        struct ata_port *ap = dev->ap;
+        struct ata_link *link = dev->link;
+        struct ata_port *ap = link->ap;
         unsigned long flags;
 
         /* SATA spd limit is bound to the first device */
-        ap->sata_spd_limit = ap->hw_sata_spd_limit;
-        ap->sata_spd = 0;
+        link->sata_spd_limit = link->hw_sata_spd_limit;
+        link->sata_spd = 0;
 
         /* High bits of dev->flags are used to record warm plug
          * requests which occur asynchronously.  Synchronize using
@@ -6080,8 +6087,8 @@ struct ata_port *ata_port_alloc(struct ata_host *host)
         ap->host = host;
         ap->dev = host->dev;
 
-        ap->hw_sata_spd_limit = UINT_MAX;
-        ap->active_tag = ATA_TAG_POISON;
+        ap->link.hw_sata_spd_limit = UINT_MAX;
+        ap->link.active_tag = ATA_TAG_POISON;
         ap->last_ctl = 0xFF;
 
 #if defined(ATA_VERBOSE_DEBUG)
@@ -6104,9 +6111,11 @@ struct ata_port *ata_port_alloc(struct ata_host *host)
 
         ap->cbl = ATA_CBL_NONE;
 
+        ap->link.ap = ap;
+
         for (i = 0; i < ATA_MAX_DEVICES; i++) {
-                struct ata_device *dev = &ap->device[i];
-                dev->ap = ap;
+                struct ata_device *dev = &ap->link.device[i];
+                dev->link = &ap->link;
                 dev->devno = i;
                 ata_dev_init(dev);
         }
@@ -6402,9 +6411,9 @@ int ata_host_register(struct ata_host *host, struct scsi_host_template *sht)
                 if (sata_scr_read(ap, SCR_CONTROL, &scontrol) == 0) {
                         int spd = (scontrol >> 4) & 0xf;
                         if (spd)
-                                ap->hw_sata_spd_limit &= (1 << spd) - 1;
+                                ap->link.hw_sata_spd_limit &= (1 << spd) - 1;
                 }
-                ap->sata_spd_limit = ap->hw_sata_spd_limit;
+                ap->link.sata_spd_limit = ap->link.hw_sata_spd_limit;
 
                 /* report the secondary IRQ for second channel legacy */
                 irq_line = host->irq;
@@ -6436,7 +6445,7 @@ int ata_host_register(struct ata_host *host, struct scsi_host_template *sht)
 
                 /* probe */
                 if (ap->ops->error_handler) {
-                        struct ata_eh_info *ehi = &ap->eh_info;
+                        struct ata_eh_info *ehi = &ap->link.eh_info;
                         unsigned long flags;
 
                         ata_port_probe(ap);
@@ -6560,7 +6569,7 @@ void ata_port_detach(struct ata_port *ap)
         spin_lock_irqsave(ap->lock, flags);
 
         for (i = 0; i < ATA_MAX_DEVICES; i++)
-                ata_dev_disable(&ap->device[i]);
+                ata_dev_disable(&ap->link.device[i]);
 
         spin_unlock_irqrestore(ap->lock, flags);
 
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index ac6ceed4bb60..e2681f56ed44 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -195,7 +195,7 @@ static int ata_ering_map(struct ata_ering *ering,
 
 static unsigned int ata_eh_dev_action(struct ata_device *dev)
 {
-        struct ata_eh_context *ehc = &dev->ap->eh_context;
+        struct ata_eh_context *ehc = &dev->link->eh_context;
 
         return ehc->i.action | ehc->i.dev_action[dev->devno];
 }
@@ -261,7 +261,7 @@ enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd)
 
         ret = EH_HANDLED;
         spin_lock_irqsave(ap->lock, flags);
-        qc = ata_qc_from_tag(ap, ap->active_tag);
+        qc = ata_qc_from_tag(ap, ap->link.active_tag);
         if (qc) {
                 WARN_ON(qc->scsicmd != cmd);
                 qc->flags |= ATA_QCFLAG_EH_SCHEDULED;
@@ -371,9 +371,9 @@ void ata_scsi_error(struct Scsi_Host *host)
                 /* fetch & clear EH info */
                 spin_lock_irqsave(ap->lock, flags);
 
-                memset(&ap->eh_context, 0, sizeof(ap->eh_context));
-                ap->eh_context.i = ap->eh_info;
-                memset(&ap->eh_info, 0, sizeof(ap->eh_info));
+                memset(&ap->link.eh_context, 0, sizeof(ap->link.eh_context));
+                ap->link.eh_context.i = ap->link.eh_info;
+                memset(&ap->link.eh_info, 0, sizeof(ap->link.eh_info));
 
                 ap->pflags |= ATA_PFLAG_EH_IN_PROGRESS;
                 ap->pflags &= ~ATA_PFLAG_EH_PENDING;
@@ -409,7 +409,7 @@ void ata_scsi_error(struct Scsi_Host *host)
                 }
 
                 /* this run is complete, make sure EH info is clear */
-                memset(&ap->eh_info, 0, sizeof(ap->eh_info));
+                memset(&ap->link.eh_info, 0, sizeof(ap->link.eh_info));
 
                 /* Clear host_eh_scheduled while holding ap->lock such
                  * that if exception occurs after this point but
@@ -420,7 +420,7 @@ void ata_scsi_error(struct Scsi_Host *host)
 
                 spin_unlock_irqrestore(ap->lock, flags);
         } else {
-                WARN_ON(ata_qc_from_tag(ap, ap->active_tag) == NULL);
+                WARN_ON(ata_qc_from_tag(ap, ap->link.active_tag) == NULL);
                 ap->ops->eng_timeout(ap);
         }
 
@@ -575,7 +575,7 @@ void ata_eng_timeout(struct ata_port *ap)
 {
         DPRINTK("ENTER\n");
 
-        ata_qc_timeout(ata_qc_from_tag(ap, ap->active_tag));
+        ata_qc_timeout(ata_qc_from_tag(ap, ap->link.active_tag));
 
         DPRINTK("EXIT\n");
 }
@@ -922,7 +922,7 @@ void ata_eh_qc_retry(struct ata_queued_cmd *qc)
  */
 static void ata_eh_detach_dev(struct ata_device *dev)
 {
-        struct ata_port *ap = dev->ap;
+        struct ata_port *ap = dev->link->ap;
         unsigned long flags;
 
         ata_dev_disable(dev);
@@ -937,8 +937,8 @@ static void ata_eh_detach_dev(struct ata_device *dev)
         }
 
         /* clear per-dev EH actions */
-        ata_eh_clear_action(dev, &ap->eh_info, ATA_EH_PERDEV_MASK);
-        ata_eh_clear_action(dev, &ap->eh_context.i, ATA_EH_PERDEV_MASK);
+        ata_eh_clear_action(dev, &dev->link->eh_info, ATA_EH_PERDEV_MASK);
+        ata_eh_clear_action(dev, &dev->link->eh_context.i, ATA_EH_PERDEV_MASK);
 
         spin_unlock_irqrestore(ap->lock, flags);
 }
@@ -950,8 +950,8 @@ static void ata_eh_detach_dev(struct ata_device *dev)
  *      @action: action about to be performed
  *
  *      Called just before performing EH actions to clear related bits
- *      in @ap->eh_info such that eh actions are not unnecessarily
- *      repeated.
+ *      in @ap->link.eh_info such that eh actions are not
+ *      unnecessarily repeated.
  *
  *      LOCKING:
  *      None.
@@ -960,8 +960,8 @@ static void ata_eh_about_to_do(struct ata_port *ap, struct ata_device *dev,
                                unsigned int action)
 {
         unsigned long flags;
-        struct ata_eh_info *ehi = &ap->eh_info;
-        struct ata_eh_context *ehc = &ap->eh_context;
+        struct ata_eh_info *ehi = &ap->link.eh_info;
+        struct ata_eh_context *ehc = &ap->link.eh_context;
 
         spin_lock_irqsave(ap->lock, flags);
 
@@ -993,7 +993,7 @@ static void ata_eh_about_to_do(struct ata_port *ap, struct ata_device *dev,
  *      @action: action just completed
  *
  *      Called right after performing EH actions to clear related bits
- *      in @ap->eh_context.
+ *      in @ap->link.eh_context.
  *
  *      LOCKING:
  *      None.
@@ -1001,13 +1001,15 @@ static void ata_eh_about_to_do(struct ata_port *ap, struct ata_device *dev,
 static void ata_eh_done(struct ata_port *ap, struct ata_device *dev,
                         unsigned int action)
 {
+        struct ata_eh_context *ehc = &ap->link.eh_context;
+
         /* if reset is complete, clear all reset actions & reset modifier */
         if (action & ATA_EH_RESET_MASK) {
                 action |= ATA_EH_RESET_MASK;
-                ap->eh_context.i.flags &= ~ATA_EHI_RESET_MODIFIER_MASK;
+                ehc->i.flags &= ~ATA_EHI_RESET_MODIFIER_MASK;
         }
 
-        ata_eh_clear_action(dev, &ap->eh_context.i, action);
+        ata_eh_clear_action(dev, &ehc->i, action);
 }
 
 /**
@@ -1101,7 +1103,7 @@ static unsigned int ata_read_log_page(struct ata_device *dev,
 static int ata_eh_read_log_10h(struct ata_device *dev,
                                int *tag, struct ata_taskfile *tf)
 {
-        u8 *buf = dev->ap->sector_buf;
+        u8 *buf = dev->link->ap->sector_buf;
         unsigned int err_mask;
         u8 csum;
         int i;
@@ -1155,7 +1157,7 @@ static unsigned int atapi_eh_request_sense(struct ata_queued_cmd *qc)
 {
         struct ata_device *dev = qc->dev;
         unsigned char *sense_buf = qc->scsicmd->sense_buffer;
-        struct ata_port *ap = dev->ap;
+        struct ata_port *ap = dev->link->ap;
         struct ata_taskfile tf;
         u8 cdb[ATAPI_CDB_LEN];
 
@@ -1206,7 +1208,7 @@ static unsigned int atapi_eh_request_sense(struct ata_queued_cmd *qc)
  */
 static void ata_eh_analyze_serror(struct ata_port *ap)
 {
-        struct ata_eh_context *ehc = &ap->eh_context;
+        struct ata_eh_context *ehc = &ap->link.eh_context;
         u32 serror = ehc->i.serror;
         unsigned int err_mask = 0, action = 0;
 
@@ -1248,8 +1250,8 @@ static void ata_eh_analyze_serror(struct ata_port *ap)
  */
 static void ata_eh_analyze_ncq_error(struct ata_port *ap)
 {
-        struct ata_eh_context *ehc = &ap->eh_context;
-        struct ata_device *dev = ap->device;
+        struct ata_eh_context *ehc = &ap->link.eh_context;
+        struct ata_device *dev = ap->link.device;
         struct ata_queued_cmd *qc;
         struct ata_taskfile tf;
         int tag, rc;
@@ -1259,7 +1261,7 @@ static void ata_eh_analyze_ncq_error(struct ata_port *ap)
                 return;
 
         /* is it NCQ device error? */
-        if (!ap->sactive || !(ehc->i.err_mask & AC_ERR_DEV))
+        if (!ap->link.sactive || !(ehc->i.err_mask & AC_ERR_DEV))
                 return;
 
         /* has LLDD analyzed already? */
@@ -1281,7 +1283,7 @@ static void ata_eh_analyze_ncq_error(struct ata_port *ap)
                 return;
         }
 
-        if (!(ap->sactive & (1 << tag))) {
+        if (!(ap->link.sactive & (1 << tag))) {
                 ata_port_printk(ap, KERN_ERR, "log page 10h reported "
                                 "inactive tag %d\n", tag);
                 return;
@@ -1497,7 +1499,7 @@ static unsigned int ata_eh_speed_down(struct ata_device *dev, int is_io,
         /* speed down? */
         if (verdict & ATA_EH_SPDN_SPEED_DOWN) {
                 /* speed down SATA link speed if possible */
-                if (sata_down_spd_limit(dev->ap) == 0) {
+                if (sata_down_spd_limit(dev->link->ap) == 0) {
                         action |= ATA_EH_HARDRESET;
                         goto done;
                 }
@@ -1528,7 +1530,7 @@ static unsigned int ata_eh_speed_down(struct ata_device *dev, int is_io,
          * SATA.  Consider it only for PATA.
          */
         if ((verdict & ATA_EH_SPDN_FALLBACK_TO_PIO) && (dev->spdn_cnt >= 2) &&
-            (dev->ap->cbl != ATA_CBL_SATA) &&
+            (dev->link->ap->cbl != ATA_CBL_SATA) &&
             (dev->xfer_shift != ATA_SHIFT_PIO)) {
                 if (ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO) == 0) {
                         dev->spdn_cnt = 0;
@@ -1557,7 +1559,7 @@ static unsigned int ata_eh_speed_down(struct ata_device *dev, int is_io,
  */
 static void ata_eh_autopsy(struct ata_port *ap)
 {
-        struct ata_eh_context *ehc = &ap->eh_context;
+        struct ata_eh_context *ehc = &ap->link.eh_context;
         unsigned int all_err_mask = 0;
         int tag, is_io = 0;
         u32 serror;
@@ -1656,7 +1658,7 @@ static void ata_eh_autopsy(struct ata_port *ap)
  */
 static void ata_eh_report(struct ata_port *ap)
 {
-        struct ata_eh_context *ehc = &ap->eh_context;
+        struct ata_eh_context *ehc = &ap->link.eh_context;
         const char *frozen, *desc;
         int tag, nr_failed = 0;
 
@@ -1685,15 +1687,15 @@ static void ata_eh_report(struct ata_port *ap)
         if (ehc->i.dev) {
                 ata_dev_printk(ehc->i.dev, KERN_ERR, "exception Emask 0x%x "
                                "SAct 0x%x SErr 0x%x action 0x%x%s\n",
-                               ehc->i.err_mask, ap->sactive, ehc->i.serror,
-                               ehc->i.action, frozen);
+                               ehc->i.err_mask, ap->link.sactive,
+                               ehc->i.serror, ehc->i.action, frozen);
                 if (desc)
                         ata_dev_printk(ehc->i.dev, KERN_ERR, "%s\n", desc);
         } else {
                 ata_port_printk(ap, KERN_ERR, "exception Emask 0x%x "
                                 "SAct 0x%x SErr 0x%x action 0x%x%s\n",
-                                ehc->i.err_mask, ap->sactive, ehc->i.serror,
-                                ehc->i.action, frozen);
+                                ehc->i.err_mask, ap->link.sactive,
+                                ehc->i.serror, ehc->i.action, frozen);
                 if (desc)
                         ata_port_printk(ap, KERN_ERR, "%s\n", desc);
         }
@@ -1775,7 +1777,7 @@ static int ata_eh_reset(struct ata_port *ap, int classify,
                         ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
                         ata_reset_fn_t hardreset, ata_postreset_fn_t postreset)
 {
-        struct ata_eh_context *ehc = &ap->eh_context;
+        struct ata_eh_context *ehc = &ap->link.eh_context;
         unsigned int *classes = ehc->classes;
         int verbose = !(ehc->i.flags & ATA_EHI_QUIET);
         int try = 0;
@@ -1804,7 +1806,7 @@ static int ata_eh_reset(struct ata_port *ap, int classify,
                         if (rc == -ENOENT) {
                                 ata_port_printk(ap, KERN_DEBUG,
                                                 "port disabled. ignoring.\n");
-                                ap->eh_context.i.action &= ~ATA_EH_RESET_MASK;
+                                ehc->i.action &= ~ATA_EH_RESET_MASK;
 
                                 for (i = 0; i < ATA_MAX_DEVICES; i++)
                                         classes[i] = ATA_DEV_NONE;
@@ -1907,11 +1909,11 @@ static int ata_eh_reset(struct ata_port *ap, int classify,
                  * controller state is undefined.  Record the mode.
                  */
                 for (i = 0; i < ATA_MAX_DEVICES; i++)
-                        ap->device[i].pio_mode = XFER_PIO_0;
+                        ap->link.device[i].pio_mode = XFER_PIO_0;
 
                 /* record current link speed */
                 if (sata_scr_read(ap, SCR_STATUS, &sstatus) == 0)
-                        ap->sata_spd = (sstatus >> 4) & 0xf;
+                        ap->link.sata_spd = (sstatus >> 4) & 0xf;
 
                 if (postreset)
                         postreset(ap, classes);
@@ -1929,7 +1931,7 @@ static int ata_eh_reset(struct ata_port *ap, int classify,
 static int ata_eh_revalidate_and_attach(struct ata_port *ap,
                                         struct ata_device **r_failed_dev)
 {
-        struct ata_eh_context *ehc = &ap->eh_context;
+        struct ata_eh_context *ehc = &ap->link.eh_context;
         struct ata_device *dev;
         unsigned int new_mask = 0;
         unsigned long flags;
@@ -1944,7 +1946,7 @@ static int ata_eh_revalidate_and_attach(struct ata_port *ap,
         for (i = ATA_MAX_DEVICES - 1; i >= 0; i--) {
                 unsigned int action, readid_flags = 0;
 
-                dev = &ap->device[i];
+                dev = &ap->link.device[i];
                 action = ata_eh_dev_action(dev);
 
                 if (ehc->i.flags & ATA_EHI_DID_RESET)
@@ -2004,7 +2006,7 @@ static int ata_eh_revalidate_and_attach(struct ata_port *ap,
          * device detection messages backwards.
          */
         for (i = 0; i < ATA_MAX_DEVICES; i++) {
-                dev = &ap->device[i];
+                dev = &ap->link.device[i];
 
                 if (!(new_mask & (1 << i)))
                         continue;
@@ -2036,7 +2038,7 @@ static int ata_port_nr_enabled(struct ata_port *ap)
         int i, cnt = 0;
 
         for (i = 0; i < ATA_MAX_DEVICES; i++)
-                if (ata_dev_enabled(&ap->device[i]))
+                if (ata_dev_enabled(&ap->link.device[i]))
                         cnt++;
         return cnt;
 }
@@ -2046,14 +2048,14 @@ static int ata_port_nr_vacant(struct ata_port *ap)
         int i, cnt = 0;
 
         for (i = 0; i < ATA_MAX_DEVICES; i++)
-                if (ap->device[i].class == ATA_DEV_UNKNOWN)
+                if (ap->link.device[i].class == ATA_DEV_UNKNOWN)
                         cnt++;
         return cnt;
 }
 
 static int ata_eh_skip_recovery(struct ata_port *ap)
 {
-        struct ata_eh_context *ehc = &ap->eh_context;
+        struct ata_eh_context *ehc = &ap->link.eh_context;
         int i;
 
         /* thaw frozen port, resume link and recover failed devices */
@@ -2063,7 +2065,7 @@ static int ata_eh_skip_recovery(struct ata_port *ap)
 
         /* skip if class codes for all vacant slots are ATA_DEV_NONE */
         for (i = 0; i < ATA_MAX_DEVICES; i++) {
-                struct ata_device *dev = &ap->device[i];
+                struct ata_device *dev = &ap->link.device[i];
 
                 if (dev->class == ATA_DEV_UNKNOWN &&
                     ehc->classes[dev->devno] != ATA_DEV_NONE)
@@ -2075,8 +2077,8 @@ static int ata_eh_skip_recovery(struct ata_port *ap)
 
 static void ata_eh_handle_dev_fail(struct ata_device *dev, int err)
 {
-        struct ata_port *ap = dev->ap;
-        struct ata_eh_context *ehc = &ap->eh_context;
+        struct ata_port *ap = dev->link->ap;
+        struct ata_eh_context *ehc = &dev->link->eh_context;
 
         ehc->tries[dev->devno]--;
 
@@ -2149,7 +2151,7 @@ static int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset,
                           ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
                           ata_postreset_fn_t postreset)
 {
-        struct ata_eh_context *ehc = &ap->eh_context;
+        struct ata_eh_context *ehc = &ap->link.eh_context;
         struct ata_device *dev;
         int i, rc;
 
@@ -2157,7 +2159,7 @@ static int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset,
 
         /* prep for recovery */
         for (i = 0; i < ATA_MAX_DEVICES; i++) {
-                dev = &ap->device[i];
+                dev = &ap->link.device[i];
 
                 ehc->tries[dev->devno] = ATA_EH_DEV_TRIES;
 
@@ -2240,7 +2242,7 @@ static int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset,
  out:
         if (rc) {
                 for (i = 0; i < ATA_MAX_DEVICES; i++)
-                        ata_dev_disable(&ap->device[i]);
+                        ata_dev_disable(&ap->link.device[i]);
         }
 
         DPRINTK("EXIT, rc=%d\n", rc);
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index e83647651b31..ec0e2638200e 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -1368,14 +1368,14 @@ static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
                 case ATA_CMD_SET_FEATURES:
                         if ((qc->tf.feature == SETFEATURES_WC_ON) ||
                             (qc->tf.feature == SETFEATURES_WC_OFF)) {
-                                ap->eh_info.action |= ATA_EH_REVALIDATE;
+                                ap->link.eh_info.action |= ATA_EH_REVALIDATE;
                                 ata_port_schedule_eh(ap);
                         }
                         break;
 
                 case ATA_CMD_INIT_DEV_PARAMS: /* CHS translation changed */
                 case ATA_CMD_SET_MULTI: /* multi_count changed */
-                        ap->eh_info.action |= ATA_EH_REVALIDATE;
+                        ap->link.eh_info.action |= ATA_EH_REVALIDATE;
                         ata_port_schedule_eh(ap);
                         break;
                 }
@@ -1439,14 +1439,14 @@ static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
  */
 static int ata_scmd_need_defer(struct ata_device *dev, int is_io)
 {
-        struct ata_port *ap = dev->ap;
+        struct ata_link *link = dev->link;
         int is_ncq = is_io && ata_ncq_enabled(dev);
 
         if (is_ncq) {
-                if (!ata_tag_valid(ap->active_tag))
+                if (!ata_tag_valid(link->active_tag))
                         return 0;
         } else {
-                if (!ata_tag_valid(ap->active_tag) && !ap->sactive)
+                if (!ata_tag_valid(link->active_tag) && !link->sactive)
                         return 0;
         }
         return 1;
@@ -2426,7 +2426,7 @@ static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
 static struct ata_device * ata_find_dev(struct ata_port *ap, int id)
 {
         if (likely(id < ATA_MAX_DEVICES))
-                return &ap->device[id];
+                return &ap->link.device[id];
         return NULL;
 }
 
@@ -2458,7 +2458,7 @@ static int ata_scsi_dev_enabled(struct ata_device *dev)
         if (unlikely(!ata_dev_enabled(dev)))
                 return 0;
 
-        if (!atapi_enabled || (dev->ap->flags & ATA_FLAG_NO_ATAPI)) {
+        if (!atapi_enabled || (dev->link->ap->flags & ATA_FLAG_NO_ATAPI)) {
                 if (unlikely(dev->class == ATA_DEV_ATAPI)) {
                         ata_dev_printk(dev, KERN_WARNING,
                                        "WARNING: ATAPI is %s, device ignored.\n",
@@ -2961,7 +2961,7 @@ void ata_scsi_scan_host(struct ata_port *ap, int sync)
         for (i = 0; i < ATA_MAX_DEVICES; i++) {
                 struct scsi_device *sdev;
 
-                dev = &ap->device[i];
+                dev = &ap->link.device[i];
 
                 if (!ata_dev_enabled(dev) || dev->sdev)
                         continue;
@@ -2978,7 +2978,7 @@ void ata_scsi_scan_host(struct ata_port *ap, int sync)
          * whether all devices are attached.
          */
         for (i = 0; i < ATA_MAX_DEVICES; i++) {
-                dev = &ap->device[i];
+                dev = &ap->link.device[i];
                 if (ata_dev_enabled(dev) && !dev->sdev)
                         break;
         }
@@ -3049,7 +3049,7 @@ int ata_scsi_offline_dev(struct ata_device *dev)
  */
 static void ata_scsi_remove_dev(struct ata_device *dev)
 {
-        struct ata_port *ap = dev->ap;
+        struct ata_port *ap = dev->link->ap;
         struct scsi_device *sdev;
         unsigned long flags;
 
@@ -3123,7 +3123,7 @@ void ata_scsi_hotplug(struct work_struct *work)
 
         /* unplug detached devices */
         for (i = 0; i < ATA_MAX_DEVICES; i++) {
-                struct ata_device *dev = &ap->device[i];
+                struct ata_device *dev = &ap->link.device[i];
                 unsigned long flags;
 
                 if (!(dev->flags & ATA_DFLAG_DETACHED))
@@ -3162,6 +3162,7 @@ static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
                               unsigned int id, unsigned int lun)
 {
         struct ata_port *ap = ata_shost_to_port(shost);
+        struct ata_eh_info *ehi = &ap->link.eh_info;
         unsigned long flags;
         int rc = 0;
 
@@ -3175,15 +3176,15 @@ static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
         spin_lock_irqsave(ap->lock, flags);
 
         if (id == SCAN_WILD_CARD) {
-                ap->eh_info.probe_mask |= (1 << ATA_MAX_DEVICES) - 1;
-                ap->eh_info.action |= ATA_EH_SOFTRESET;
+                ehi->probe_mask |= (1 << ATA_MAX_DEVICES) - 1;
+                ehi->action |= ATA_EH_SOFTRESET;
         } else {
                 struct ata_device *dev = ata_find_dev(ap, id);
 
                 if (dev) {
-                        ap->eh_info.probe_mask |= 1 << dev->devno;
-                        ap->eh_info.action |= ATA_EH_SOFTRESET;
-                        ap->eh_info.flags |= ATA_EHI_RESUME_LINK;
+                        ehi->probe_mask |= 1 << dev->devno;
+                        ehi->action |= ATA_EH_SOFTRESET;
+                        ehi->flags |= ATA_EHI_RESUME_LINK;
                 } else
                         rc = -EINVAL;
         }
@@ -3220,7 +3221,7 @@ void ata_scsi_dev_rescan(struct work_struct *work)
         spin_lock_irqsave(ap->lock, flags);
 
         for (i = 0; i < ATA_MAX_DEVICES; i++) {
-                struct ata_device *dev = &ap->device[i];
+                struct ata_device *dev = &ap->link.device[i];
                 struct scsi_device *sdev = dev->sdev;
 
                 if (!ata_dev_enabled(dev) || !sdev)
@@ -3359,7 +3360,7 @@ EXPORT_SYMBOL_GPL(ata_sas_port_destroy);
 int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap)
 {
         ata_scsi_sdev_config(sdev);
-        ata_scsi_dev_config(sdev, ap->device);
+        ata_scsi_dev_config(sdev, ap->link.device);
         return 0;
 }
 EXPORT_SYMBOL_GPL(ata_sas_slave_configure);
@@ -3382,8 +3383,8 @@ int ata_sas_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *),
 
         ata_scsi_dump_cdb(ap, cmd);
 
-        if (likely(ata_scsi_dev_enabled(ap->device)))
-                rc = __ata_scsi_queuecmd(cmd, done, ap->device);
+        if (likely(ata_scsi_dev_enabled(ap->link.device)))
+                rc = __ata_scsi_queuecmd(cmd, done, ap->link.device);
         else {
                 cmd->result = (DID_BAD_TARGET << 16);
                 done(cmd);
diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c
index 8023167bbbeb..2100cd61ed69 100644
--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -445,7 +445,7 @@ void ata_bmdma_drive_eh(struct ata_port *ap, ata_prereset_fn_t prereset,
         unsigned long flags;
         int thaw = 0;
 
-        qc = __ata_qc_from_tag(ap, ap->active_tag);
+        qc = __ata_qc_from_tag(ap, ap->link.active_tag);
         if (qc && !(qc->flags & ATA_QCFLAG_FAILED))
                 qc = NULL;
 
@@ -909,7 +909,7 @@ unsigned long ata_pci_default_filter(struct ata_device *adev, unsigned long xfer
         /* Filter out DMA modes if the device has been configured by
            the BIOS as PIO only */
 
-        if (adev->ap->ioaddr.bmdma_addr == 0)
+        if (adev->link->ap->ioaddr.bmdma_addr == 0)
                 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
         return xfer_mask;
 }
diff --git a/drivers/ata/pata_it821x.c b/drivers/ata/pata_it821x.c
index 5d8b91e70ecd..ece1a28f0a4a 100644
--- a/drivers/ata/pata_it821x.c
+++ b/drivers/ata/pata_it821x.c
@@ -391,7 +391,7 @@ static void it821x_passthru_dev_select(struct ata_port *ap,
 {
         struct it821x_dev *itdev = ap->private_data;
         if (itdev && device != itdev->last_device) {
-                struct ata_device *adev = &ap->device[device];
+                struct ata_device *adev = &ap->link.device[device];
                 it821x_program(ap, adev, itdev->pio[adev->devno]);
                 itdev->last_device = device;
         }
@@ -464,7 +464,7 @@ static int it821x_smart_set_mode(struct ata_port *ap, struct ata_device **unused
         int i;
 
         for (i = 0; i < ATA_MAX_DEVICES; i++) {
-                struct ata_device *dev = &ap->device[i];
+                struct ata_device *dev = &ap->link.device[i];
                 if (ata_dev_enabled(dev)) {
                         /* We don't really care */
                         dev->pio_mode = XFER_PIO_0;
diff --git a/drivers/ata/pata_ixp4xx_cf.c b/drivers/ata/pata_ixp4xx_cf.c
index 5dea3584c6c2..3e2b8ce5fa37 100644
--- a/drivers/ata/pata_ixp4xx_cf.c
+++ b/drivers/ata/pata_ixp4xx_cf.c
@@ -31,7 +31,7 @@ static int ixp4xx_set_mode(struct ata_port *ap, struct ata_device **error)
         int i;
 
         for (i = 0; i < ATA_MAX_DEVICES; i++) {
-                struct ata_device *dev = &ap->device[i];
+                struct ata_device *dev = &ap->link.device[i];
                 if (ata_dev_enabled(dev)) {
                         ata_dev_printk(dev, KERN_INFO, "configured for PIO0\n");
                         dev->pio_mode = XFER_PIO_0;
@@ -49,7 +49,7 @@ static void ixp4xx_mmio_data_xfer(struct ata_device *adev, unsigned char *buf,
         unsigned int i;
         unsigned int words = buflen >> 1;
         u16 *buf16 = (u16 *) buf;
-        struct ata_port *ap = adev->ap;
+        struct ata_port *ap = adev->link->ap;
         void __iomem *mmio = ap->ioaddr.data_addr;
         struct ixp4xx_pata_data *data = ap->host->dev->platform_data;
 
diff --git a/drivers/ata/pata_legacy.c b/drivers/ata/pata_legacy.c
index edffc25d2d3f..4bcc0ae8d108 100644
--- a/drivers/ata/pata_legacy.c
+++ b/drivers/ata/pata_legacy.c
@@ -112,7 +112,7 @@ static int legacy_set_mode(struct ata_port *ap, struct ata_device **unused)
         int i;
 
         for (i = 0; i < ATA_MAX_DEVICES; i++) {
-                struct ata_device *dev = &ap->device[i];
+                struct ata_device *dev = &ap->link.device[i];
                 if (ata_dev_enabled(dev)) {
                         ata_dev_printk(dev, KERN_INFO, "configured for PIO\n");
                         dev->pio_mode = XFER_PIO_0;
@@ -256,7 +256,7 @@ static void pdc20230_set_piomode(struct ata_port *ap, struct ata_device *adev)
 
 static void pdc_data_xfer_vlb(struct ata_device *adev, unsigned char *buf, unsigned int buflen, int write_data)
 {
-        struct ata_port *ap = adev->ap;
+        struct ata_port *ap = adev->link->ap;
         int slop = buflen & 3;
         unsigned long flags;
 
diff --git a/drivers/ata/pata_optidma.c b/drivers/ata/pata_optidma.c
index f89bdfde16d0..f8234d7fd825 100644
--- a/drivers/ata/pata_optidma.c
+++ b/drivers/ata/pata_optidma.c
@@ -340,8 +340,8 @@ static int optidma_set_mode(struct ata_port *ap, struct ata_device **r_failed)
                 pci_read_config_byte(pdev, 0x43, &r);
 
                 r &= (0x0F << nybble);
-                r |= (optidma_make_bits43(&ap->device[0]) +
-                     (optidma_make_bits43(&ap->device[0]) << 2)) << nybble;
+                r |= (optidma_make_bits43(&ap->link.device[0]) +
+                     (optidma_make_bits43(&ap->link.device[0]) << 2)) << nybble;
                 pci_write_config_byte(pdev, 0x43, r);
         }
         return rc;
diff --git a/drivers/ata/pata_pcmcia.c b/drivers/ata/pata_pcmcia.c
index 0f2b027624d6..890f649ddcce 100644
--- a/drivers/ata/pata_pcmcia.c
+++ b/drivers/ata/pata_pcmcia.c
@@ -67,8 +67,8 @@ struct ata_pcmcia_info {
 
 static int pcmcia_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
 {
-        struct ata_device *master = &ap->device[0];
-        struct ata_device *slave = &ap->device[1];
+        struct ata_device *master = &ap->link.device[0];
+        struct ata_device *slave = &ap->link.device[1];
 
         if (!ata_dev_enabled(master) || !ata_dev_enabled(slave))
                 return ata_do_set_mode(ap, r_failed_dev);
diff --git a/drivers/ata/pata_pdc2027x.c b/drivers/ata/pata_pdc2027x.c
index bb64a986e8f5..fa780509a1dc 100644
--- a/drivers/ata/pata_pdc2027x.c
+++ b/drivers/ata/pata_pdc2027x.c
@@ -486,7 +486,7 @@ static int pdc2027x_set_mode(struct ata_port *ap, struct ata_device **r_failed)
                 return i;
 
         for (i = 0; i < ATA_MAX_DEVICES; i++) {
-                struct ata_device *dev = &ap->device[i];
+                struct ata_device *dev = &ap->link.device[i];
 
                 if (ata_dev_enabled(dev)) {
 
diff --git a/drivers/ata/pata_platform.c b/drivers/ata/pata_platform.c
index 5086d03f2d7c..e89656bffa84 100644
--- a/drivers/ata/pata_platform.c
+++ b/drivers/ata/pata_platform.c
@@ -35,7 +35,7 @@ static int pata_platform_set_mode(struct ata_port *ap, struct ata_device **unuse
         int i;
 
         for (i = 0; i < ATA_MAX_DEVICES; i++) {
-                struct ata_device *dev = &ap->device[i];
+                struct ata_device *dev = &ap->link.device[i];
 
                 if (ata_dev_enabled(dev)) {
                         /* We don't really care */
diff --git a/drivers/ata/pata_qdi.c b/drivers/ata/pata_qdi.c
index 1998c19e8743..ec2206e820ac 100644
--- a/drivers/ata/pata_qdi.c
+++ b/drivers/ata/pata_qdi.c
@@ -126,7 +126,7 @@ static unsigned int qdi_qc_issue_prot(struct ata_queued_cmd *qc)
 
 static void qdi_data_xfer(struct ata_device *adev, unsigned char *buf, unsigned int buflen, int write_data)
 {
-        struct ata_port *ap = adev->ap;
+        struct ata_port *ap = adev->link->ap;
         int slop = buflen & 3;
 
         if (ata_id_has_dword_io(adev->id)) {
diff --git a/drivers/ata/pata_rz1000.c b/drivers/ata/pata_rz1000.c
index 7632fcb070ca..57363c0ce068 100644
--- a/drivers/ata/pata_rz1000.c
+++ b/drivers/ata/pata_rz1000.c
@@ -39,7 +39,7 @@ static int rz1000_set_mode(struct ata_port *ap, struct ata_device **unused)
         int i;
 
         for (i = 0; i < ATA_MAX_DEVICES; i++) {
-                struct ata_device *dev = &ap->device[i];
+                struct ata_device *dev = &ap->link.device[i];
                 if (ata_dev_enabled(dev)) {
                         /* We don't really care */
                         dev->pio_mode = XFER_PIO_0;
diff --git a/drivers/ata/pata_scc.c b/drivers/ata/pata_scc.c
index 2d048ef25a5a..aab068fbb7bc 100644
--- a/drivers/ata/pata_scc.c
+++ b/drivers/ata/pata_scc.c
@@ -785,7 +785,7 @@ static u8 scc_bmdma_status (struct ata_port *ap)
 static void scc_data_xfer (struct ata_device *adev, unsigned char *buf,
                            unsigned int buflen, int write_data)
 {
-        struct ata_port *ap = adev->ap;
+        struct ata_port *ap = adev->link->ap;
         unsigned int words = buflen >> 1;
         unsigned int i;
         u16 *buf16 = (u16 *) buf;
diff --git a/drivers/ata/pata_sis.c b/drivers/ata/pata_sis.c
index cce2834b2b60..9d6f81d52e18 100644
--- a/drivers/ata/pata_sis.c
+++ b/drivers/ata/pata_sis.c
@@ -84,7 +84,7 @@ static int sis_short_ata40(struct pci_dev *dev)
 
 static int sis_old_port_base(struct ata_device *adev)
 {
-        return  0x40 + (4 * adev->ap->port_no) +  (2 * adev->devno);
+        return  0x40 + (4 * adev->link->ap->port_no) +  (2 * adev->devno);
 }
 
 /**
diff --git a/drivers/ata/pata_winbond.c b/drivers/ata/pata_winbond.c
index 83abfeca4057..c37570330073 100644
--- a/drivers/ata/pata_winbond.c
+++ b/drivers/ata/pata_winbond.c
@@ -94,7 +94,7 @@ static void winbond_set_piomode(struct ata_port *ap, struct ata_device *adev)
 
 static void winbond_data_xfer(struct ata_device *adev, unsigned char *buf, unsigned int buflen, int write_data)
 {
-        struct ata_port *ap = adev->ap;
+        struct ata_port *ap = adev->link->ap;
         int slop = buflen & 3;
 
         if (ata_id_has_dword_io(adev->id)) {
diff --git a/drivers/ata/pdc_adma.c b/drivers/ata/pdc_adma.c
index c95c1bf7df37..064a3b505609 100644
--- a/drivers/ata/pdc_adma.c
+++ b/drivers/ata/pdc_adma.c
@@ -485,7 +485,7 @@ static inline unsigned int adma_intr_pkt(struct ata_host *host)
                 pp = ap->private_data;
                 if (!pp || pp->state != adma_state_pkt)
                         continue;
-                qc = ata_qc_from_tag(ap, ap->active_tag);
+                qc = ata_qc_from_tag(ap, ap->link.active_tag);
                 if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING))) {
                         if (status & aPERR)
                                 qc->err_mask |= AC_ERR_HOST_BUS;
@@ -500,7 +500,7 @@ static inline unsigned int adma_intr_pkt(struct ata_host *host)
                         if (!qc->err_mask)
                                 ata_qc_complete(qc);
                         else {
-                                struct ata_eh_info *ehi = &ap->eh_info;
+                                struct ata_eh_info *ehi = &ap->link.eh_info;
                                 ata_ehi_clear_desc(ehi);
                                 ata_ehi_push_desc(ehi,
                                         "ADMA-status 0x%02X", status);
@@ -529,7 +529,7 @@ static inline unsigned int adma_intr_mmio(struct ata_host *host)
                         struct adma_port_priv *pp = ap->private_data;
                         if (!pp || pp->state != adma_state_mmio)
                                 continue;
-                        qc = ata_qc_from_tag(ap, ap->active_tag);
+                        qc = ata_qc_from_tag(ap, ap->link.active_tag);
                         if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING))) {
 
                                 /* check main status, clearing INTRQ */
@@ -545,7 +545,8 @@ static inline unsigned int adma_intr_mmio(struct ata_host *host)
                                 if (!qc->err_mask)
                                         ata_qc_complete(qc);
                                 else {
-                                        struct ata_eh_info *ehi = &ap->eh_info;
+                                        struct ata_eh_info *ehi =
+                                                &ap->link.eh_info;
                                         ata_ehi_clear_desc(ehi);
                                         ata_ehi_push_desc(ehi,
                                                 "status 0x%02X", status);
diff --git a/drivers/ata/sata_inic162x.c b/drivers/ata/sata_inic162x.c
index fdbed8ecdfc2..3c0ef7a2f2fe 100644
--- a/drivers/ata/sata_inic162x.c
+++ b/drivers/ata/sata_inic162x.c
@@ -285,7 +285,7 @@ static void inic_irq_clear(struct ata_port *ap)
 static void inic_host_intr(struct ata_port *ap)
 {
         void __iomem *port_base = inic_port_base(ap);
-        struct ata_eh_info *ehi = &ap->eh_info;
+        struct ata_eh_info *ehi = &ap->link.eh_info;
         u8 irq_stat;
 
         /* fetch and clear irq */
@@ -293,7 +293,8 @@ static void inic_host_intr(struct ata_port *ap)
         writeb(irq_stat, port_base + PORT_IRQ_STAT);
 
         if (likely(!(irq_stat & PIRQ_ERR))) {
-                struct ata_queued_cmd *qc = ata_qc_from_tag(ap, ap->active_tag);
+                struct ata_queued_cmd *qc =
+                        ata_qc_from_tag(ap, ap->link.active_tag);
 
                 if (unlikely(!qc || (qc->tf.flags & ATA_TFLAG_POLLING))) {
                         ata_chk_status(ap);     /* clear ATA interrupt */
@@ -421,7 +422,7 @@ static int inic_hardreset(struct ata_port *ap, unsigned int *class,
 {
         void __iomem *port_base = inic_port_base(ap);
         void __iomem *idma_ctl = port_base + PORT_IDMA_CTL;
-        const unsigned long *timing = sata_ehc_deb_timing(&ap->eh_context);
+        const unsigned long *timing = sata_ehc_deb_timing(&ap->link.eh_context);
         u16 val;
         int rc;
 
diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c
index d9832e234e44..246e7c5fdce8 100644
--- a/drivers/ata/sata_mv.c
+++ b/drivers/ata/sata_mv.c
@@ -1415,7 +1415,7 @@ static void mv_err_intr(struct ata_port *ap, struct ata_queued_cmd *qc)
         struct mv_host_priv *hpriv = ap->host->private_data;
         unsigned int edma_enabled = (pp->pp_flags & MV_PP_FLAG_EDMA_EN);
         unsigned int action = 0, err_mask = 0;
-        struct ata_eh_info *ehi = &ap->eh_info;
+        struct ata_eh_info *ehi = &ap->link.eh_info;
 
         ata_ehi_clear_desc(ehi);
 
@@ -1508,7 +1508,7 @@ static void mv_intr_pio(struct ata_port *ap)
                 return;
 
         /* get active ATA command */
-        qc = ata_qc_from_tag(ap, ap->active_tag);
+        qc = ata_qc_from_tag(ap, ap->link.active_tag);
         if (unlikely(!qc))                      /* no active tag */
                 return;
         if (qc->tf.flags & ATA_TFLAG_POLLING)   /* polling; we don't own qc */
@@ -1543,7 +1543,7 @@ static void mv_intr_edma(struct ata_port *ap)
 
                 /* 50xx: get active ATA command */
                 if (IS_GEN_I(hpriv))
-                        tag = ap->active_tag;
+                        tag = ap->link.active_tag;
 
                 /* Gen II/IIE: get active ATA command via tag, to enable
                  * support for queueing.  this works transparently for
@@ -1646,7 +1646,7 @@ static void mv_host_intr(struct ata_host *host, u32 relevant, unsigned int hc)
                 if (unlikely(have_err_bits)) {
                         struct ata_queued_cmd *qc;
 
-                        qc = ata_qc_from_tag(ap, ap->active_tag);
+                        qc = ata_qc_from_tag(ap, ap->link.active_tag);
                         if (qc && (qc->tf.flags & ATA_TFLAG_POLLING))
                                 continue;
 
@@ -1688,14 +1688,14 @@ static void mv_pci_error(struct ata_host *host, void __iomem *mmio)
         for (i = 0; i < host->n_ports; i++) {
                 ap = host->ports[i];
                 if (!ata_port_offline(ap)) {
-                        ehi = &ap->eh_info;
+                        ehi = &ap->link.eh_info;
                         ata_ehi_clear_desc(ehi);
                         if (!printed++)
                                 ata_ehi_push_desc(ehi,
                                         "PCI err cause 0x%08x", err_cause);
                         err_mask = AC_ERR_HOST_BUS;
                         ehi->action = ATA_EH_HARDRESET;
-                        qc = ata_qc_from_tag(ap, ap->active_tag);
+                        qc = ata_qc_from_tag(ap, ap->link.active_tag);
                         if (qc)
                                 qc->err_mask |= err_mask;
                         else
@@ -2269,7 +2269,7 @@ comreset_retry:
 static int mv_prereset(struct ata_port *ap, unsigned long deadline)
 {
         struct mv_port_priv *pp = ap->private_data;
-        struct ata_eh_context *ehc = &ap->eh_context;
+        struct ata_eh_context *ehc = &ap->link.eh_context;
         int rc;
 
         rc = mv_stop_dma(ap);
diff --git a/drivers/ata/sata_nv.c b/drivers/ata/sata_nv.c
index 40dc73139858..df4d50dcffbc 100644
--- a/drivers/ata/sata_nv.c
+++ b/drivers/ata/sata_nv.c
@@ -594,7 +594,7 @@ static int nv_adma_slave_config(struct scsi_device *sdev)
                 /* Not a proper libata device, ignore */
                 return rc;
 
-        if (ap->device[sdev->id].class == ATA_DEV_ATAPI) {
+        if (ap->link.device[sdev->id].class == ATA_DEV_ATAPI) {
                 /*
                  * NVIDIA reports that ADMA mode does not support ATAPI commands.
                  * Therefore ATAPI commands are sent through the legacy interface.
@@ -711,7 +711,7 @@ static int nv_adma_check_cpb(struct ata_port *ap, int cpb_num, int force_err)
                      flags & (NV_CPB_RESP_ATA_ERR |
                               NV_CPB_RESP_CMD_ERR |
                               NV_CPB_RESP_CPB_ERR)))) {
-                struct ata_eh_info *ehi = &ap->eh_info;
+                struct ata_eh_info *ehi = &ap->link.eh_info;
                 int freeze = 0;
 
                 ata_ehi_clear_desc(ehi);
@@ -747,7 +747,7 @@ static int nv_adma_check_cpb(struct ata_port *ap, int cpb_num, int force_err)
                         DPRINTK("Completing qc from tag %d\n",cpb_num);
                         ata_qc_complete(qc);
                 } else {
-                        struct ata_eh_info *ehi = &ap->eh_info;
+                        struct ata_eh_info *ehi = &ap->link.eh_info;
                         /* Notifier bits set without a command may indicate the drive
                            is misbehaving. Raise host state machine violation on this
                            condition. */
@@ -764,7 +764,7 @@ static int nv_adma_check_cpb(struct ata_port *ap, int cpb_num, int force_err)
 
 static int nv_host_intr(struct ata_port *ap, u8 irq_stat)
 {
-        struct ata_queued_cmd *qc = ata_qc_from_tag(ap, ap->active_tag);
+        struct ata_queued_cmd *qc = ata_qc_from_tag(ap, ap->link.active_tag);
 
         /* freeze if hotplugged */
         if (unlikely(irq_stat & (NV_INT_ADDED | NV_INT_REMOVED))) {
@@ -817,7 +817,7 @@ static irqreturn_t nv_adma_interrupt(int irq, void *dev_instance)
                         if (pp->flags & NV_ADMA_PORT_REGISTER_MODE) {
                                 u8 irq_stat = readb(host->iomap[NV_MMIO_BAR] + NV_INT_STATUS_CK804)
                                         >> (NV_INT_PORT_SHIFT * i);
-                                if(ata_tag_valid(ap->active_tag))
+                                if(ata_tag_valid(ap->link.active_tag))
                                         /** NV_INT_DEV indication seems unreliable at times
                                             at least in ADMA mode. Force it on always when a
                                             command is active, to prevent losing interrupts. */
@@ -852,7 +852,7 @@ static irqreturn_t nv_adma_interrupt(int irq, void *dev_instance)
                                                NV_ADMA_STAT_HOTUNPLUG |
                                                NV_ADMA_STAT_TIMEOUT |
                                                NV_ADMA_STAT_SERROR))) {
-                                struct ata_eh_info *ehi = &ap->eh_info;
+                                struct ata_eh_info *ehi = &ap->link.eh_info;
 
                                 ata_ehi_clear_desc(ehi);
                                 __ata_ehi_push_desc(ehi, "ADMA status 0x%08x: ", status );
@@ -879,10 +879,10 @@ static irqreturn_t nv_adma_interrupt(int irq, void *dev_instance)
                                 u32 check_commands;
                                 int pos, error = 0;
 
-                                if(ata_tag_valid(ap->active_tag))
-                                        check_commands = 1 << ap->active_tag;
+                                if(ata_tag_valid(ap->link.active_tag))
+                                        check_commands = 1 << ap->link.active_tag;
                                 else
-                                        check_commands = ap->sactive;
+                                        check_commands = ap->link.sactive;
 
                                 /** Check CPBs for completed commands */
                                 while ((pos = ffs(check_commands)) && !error) {
@@ -1333,7 +1333,7 @@ static irqreturn_t nv_generic_interrupt(int irq, void *dev_instance)
                     !(ap->flags & ATA_FLAG_DISABLED)) {
                         struct ata_queued_cmd *qc;
 
-                        qc = ata_qc_from_tag(ap, ap->active_tag);
+                        qc = ata_qc_from_tag(ap, ap->link.active_tag);
                         if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)))
                                 handled += ata_host_intr(ap, qc);
                         else
@@ -1485,7 +1485,7 @@ static void nv_adma_error_handler(struct ata_port *ap)
                 int i;
                 u16 tmp;
 
-                if(ata_tag_valid(ap->active_tag) || ap->sactive) {
+                if(ata_tag_valid(ap->link.active_tag) || ap->link.sactive) {
                         u32 notifier = readl(mmio + NV_ADMA_NOTIFIER);
                         u32 notifier_error = readl(mmio + NV_ADMA_NOTIFIER_ERROR);
                         u32 gen_ctl = readl(pp->gen_block + NV_ADMA_GEN_CTL);
@@ -1501,8 +1501,8 @@ static void nv_adma_error_handler(struct ata_port *ap)
 
                         for( i=0;i<NV_ADMA_MAX_CPBS;i++) {
                                 struct nv_adma_cpb *cpb = &pp->cpb[i];
-                                if( (ata_tag_valid(ap->active_tag) && i == ap->active_tag) ||
-                                    ap->sactive & (1 << i) )
+                                if( (ata_tag_valid(ap->link.active_tag) && i == ap->link.active_tag) ||
+                                    ap->link.sactive & (1 << i) )
                                         ata_port_printk(ap, KERN_ERR,
                                                 "CPB %d: ctl_flags 0x%x, resp_flags 0x%x\n",
                                                 i, cpb->ctl_flags, cpb->resp_flags);
diff --git a/drivers/ata/sata_promise.c b/drivers/ata/sata_promise.c
index 25698cf0dce0..620d0675d18a 100644
--- a/drivers/ata/sata_promise.c
+++ b/drivers/ata/sata_promise.c
@@ -626,7 +626,7 @@ static void pdc_post_internal_cmd(struct ata_queued_cmd *qc)
 static void pdc_error_intr(struct ata_port *ap, struct ata_queued_cmd *qc,
                            u32 port_status, u32 err_mask)
 {
-        struct ata_eh_info *ehi = &ap->eh_info;
+        struct ata_eh_info *ehi = &ap->link.eh_info;
         unsigned int ac_err_mask = 0;
 
         ata_ehi_clear_desc(ehi);
@@ -773,7 +773,7 @@ static irqreturn_t pdc_interrupt (int irq, void *dev_instance)
                 tmp = hotplug_status & (0x11 << ata_no);
                 if (tmp && ap &&
                     !(ap->flags & ATA_FLAG_DISABLED)) {
-                        struct ata_eh_info *ehi = &ap->eh_info;
+                        struct ata_eh_info *ehi = &ap->link.eh_info;
                         ata_ehi_clear_desc(ehi);
                         ata_ehi_hotplugged(ehi);
                         ata_ehi_push_desc(ehi, "hotplug_status %#x", tmp);
@@ -788,7 +788,7 @@ static irqreturn_t pdc_interrupt (int irq, void *dev_instance)
                     !(ap->flags & ATA_FLAG_DISABLED)) {
                         struct ata_queued_cmd *qc;
 
-                        qc = ata_qc_from_tag(ap, ap->active_tag);
+                        qc = ata_qc_from_tag(ap, ap->link.active_tag);
                         if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)))
                                 handled += pdc_host_intr(ap, qc);
                 }
diff --git a/drivers/ata/sata_qstor.c b/drivers/ata/sata_qstor.c
index 5e1dfdda698f..ef1ad69c26ed 100644
--- a/drivers/ata/sata_qstor.c
+++ b/drivers/ata/sata_qstor.c
@@ -404,7 +404,7 @@ static inline unsigned int qs_intr_pkt(struct ata_host *host)
                                 struct qs_port_priv *pp = ap->private_data;
                                 if (!pp || pp->state != qs_state_pkt)
                                         continue;
-                                qc = ata_qc_from_tag(ap, ap->active_tag);
+                                qc = ata_qc_from_tag(ap, ap->link.active_tag);
                                 if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING))) {
                                         switch (sHST) {
                                         case 0: /* successful CPB */
@@ -437,7 +437,7 @@ static inline unsigned int qs_intr_mmio(struct ata_host *host)
                         struct qs_port_priv *pp = ap->private_data;
                         if (!pp || pp->state != qs_state_mmio)
                                 continue;
-                        qc = ata_qc_from_tag(ap, ap->active_tag);
+                        qc = ata_qc_from_tag(ap, ap->link.active_tag);
                         if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING))) {
 
                                 /* check main status, clearing INTRQ */
diff --git a/drivers/ata/sata_sil.c b/drivers/ata/sata_sil.c
index 8c72e714b456..2ddbe4cc71e4 100644
--- a/drivers/ata/sata_sil.c
+++ b/drivers/ata/sata_sil.c
@@ -312,7 +312,7 @@ static int sil_set_mode (struct ata_port *ap, struct ata_device **r_failed)
                 return rc;
 
         for (i = 0; i < 2; i++) {
-                dev = &ap->device[i];
+                dev = &ap->link.device[i];
                 if (!ata_dev_enabled(dev))
                         dev_mode[i] = 0;        /* PIO0/1/2 */
                 else if (dev->flags & ATA_DFLAG_PIO)
@@ -374,8 +374,8 @@ static int sil_scr_write(struct ata_port *ap, unsigned int sc_reg, u32 val)
 
 static void sil_host_intr(struct ata_port *ap, u32 bmdma2)
 {
-        struct ata_eh_info *ehi = &ap->eh_info;
-        struct ata_queued_cmd *qc = ata_qc_from_tag(ap, ap->active_tag);
+        struct ata_eh_info *ehi = &ap->link.eh_info;
+        struct ata_queued_cmd *qc = ata_qc_from_tag(ap, ap->link.active_tag);
         u8 status;
 
         if (unlikely(bmdma2 & SIL_DMA_SATA_IRQ)) {
@@ -394,8 +394,8 @@ static void sil_host_intr(struct ata_port *ap, u32 bmdma2)
                  * repeat probing needlessly.
                  */
                 if (!(ap->pflags & ATA_PFLAG_FROZEN)) {
-                        ata_ehi_hotplugged(&ap->eh_info);
-                        ap->eh_info.serror |= serror;
+                        ata_ehi_hotplugged(&ap->link.eh_info);
+                        ap->link.eh_info.serror |= serror;
                 }
 
                 goto freeze;
@@ -562,8 +562,8 @@ static void sil_thaw(struct ata_port *ap)
  */
 static void sil_dev_config(struct ata_device *dev)
 {
-        struct ata_port *ap = dev->ap;
-        int print_info = ap->eh_context.i.flags & ATA_EHI_PRINTINFO;
+        struct ata_port *ap = dev->link->ap;
+        int print_info = ap->link.eh_context.i.flags & ATA_EHI_PRINTINFO;
         unsigned int n, quirks = 0;
         unsigned char model_num[ATA_ID_PROD_LEN + 1];
 
diff --git a/drivers/ata/sata_sil24.c b/drivers/ata/sata_sil24.c
index 233e88693395..2d8334e7921d 100644
--- a/drivers/ata/sata_sil24.c
+++ b/drivers/ata/sata_sil24.c
@@ -456,7 +456,7 @@ static int sil24_tag(int tag)
 
 static void sil24_dev_config(struct ata_device *dev)
 {
-        void __iomem *port = dev->ap->ioaddr.cmd_addr;
+        void __iomem *port = dev->link->ap->ioaddr.cmd_addr;
 
         if (dev->cdb_len == 16)
                 writel(PORT_CS_CDB16, port + PORT_CTRL_STAT);
@@ -609,7 +609,7 @@ static int sil24_do_softreset(struct ata_port *ap, unsigned int *class,
         if (time_after(deadline, jiffies))
                 timeout_msec = jiffies_to_msecs(deadline - jiffies);
 
-        ata_tf_init(ap->device, &tf);   /* doesn't really matter */
+        ata_tf_init(ap->link.device, &tf);      /* doesn't really matter */
         rc = sil24_exec_polled_cmd(ap, pmp, &tf, 0, PRB_CTRL_SRST,
                                    timeout_msec);
         if (rc == -EBUSY) {
@@ -804,7 +804,7 @@ static void sil24_error_intr(struct ata_port *ap)
 {
         void __iomem *port = ap->ioaddr.cmd_addr;
         struct sil24_port_priv *pp = ap->private_data;
-        struct ata_eh_info *ehi = &ap->eh_info;
+        struct ata_eh_info *ehi = &ap->link.eh_info;
         int freeze = 0;
         u32 irq_stat;
 
@@ -856,7 +856,7 @@ static void sil24_error_intr(struct ata_port *ap)
                 }
 
                 /* record error info */
-                qc = ata_qc_from_tag(ap, ap->active_tag);
+                qc = ata_qc_from_tag(ap, ap->link.active_tag);
                 if (qc) {
                         sil24_read_tf(ap, qc->tag, &pp->tf);
                         qc->err_mask |= err_mask;
@@ -910,7 +910,7 @@ static inline void sil24_host_intr(struct ata_port *ap)
         if (rc > 0)
                 return;
         if (rc < 0) {
-                struct ata_eh_info *ehi = &ap->eh_info;
+                struct ata_eh_info *ehi = &ap->link.eh_info;
                 ehi->err_mask |= AC_ERR_HSM;
                 ehi->action |= ATA_EH_SOFTRESET;
                 ata_port_freeze(ap);
@@ -921,7 +921,7 @@ static inline void sil24_host_intr(struct ata_port *ap)
         if (!(ap->flags & SIL24_FLAG_PCIX_IRQ_WOC) && ata_ratelimit())
                 ata_port_printk(ap, KERN_INFO, "spurious interrupt "
                         "(slot_stat 0x%x active_tag %d sactive 0x%x)\n",
-                        slot_stat, ap->active_tag, ap->sactive);
+                        slot_stat, ap->link.active_tag, ap->link.sactive);
 }
 
 static irqreturn_t sil24_interrupt(int irq, void *dev_instance)
@@ -963,7 +963,7 @@ static irqreturn_t sil24_interrupt(int irq, void *dev_instance)
 
 static void sil24_error_handler(struct ata_port *ap)
 {
-        struct ata_eh_context *ehc = &ap->eh_context;
+        struct ata_eh_context *ehc = &ap->link.eh_context;
 
         if (sil24_init_port(ap)) {
                 ata_eh_freeze_port(ap);
diff --git a/drivers/ata/sata_sx4.c b/drivers/ata/sata_sx4.c
index 97aefdd87be4..12691f091933 100644
--- a/drivers/ata/sata_sx4.c
+++ b/drivers/ata/sata_sx4.c
@@ -854,7 +854,7 @@ static irqreturn_t pdc20621_interrupt (int irq, void *dev_instance)
                     !(ap->flags & ATA_FLAG_DISABLED)) {
                         struct ata_queued_cmd *qc;
 
-                        qc = ata_qc_from_tag(ap, ap->active_tag);
+                        qc = ata_qc_from_tag(ap, ap->link.active_tag);
                         if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)))
                                 handled += pdc20621_host_intr(ap, qc, (i > 4),
                                                               mmio_base);
@@ -881,7 +881,7 @@ static void pdc_eng_timeout(struct ata_port *ap)
 
         spin_lock_irqsave(&host->lock, flags);
 
-        qc = ata_qc_from_tag(ap, ap->active_tag);
+        qc = ata_qc_from_tag(ap, ap->link.active_tag);
 
         switch (qc->tf.protocol) {
         case ATA_PROT_DMA:
diff --git a/drivers/ata/sata_via.c b/drivers/ata/sata_via.c
index 57fd30de8f0d..78a6833af713 100644
--- a/drivers/ata/sata_via.c
+++ b/drivers/ata/sata_via.c
@@ -296,7 +296,7 @@ static void svia_noop_freeze(struct ata_port *ap)
  */
 static int vt6420_prereset(struct ata_port *ap, unsigned long deadline)
 {
-        struct ata_eh_context *ehc = &ap->eh_context;
+        struct ata_eh_context *ehc = &ap->link.eh_context;
         unsigned long timeout = jiffies + (HZ * 5);
         u32 sstatus, scontrol;
         int online;
diff --git a/drivers/ata/sata_vsc.c b/drivers/ata/sata_vsc.c
index 1920915dfa2c..9586b8b51cea 100644
--- a/drivers/ata/sata_vsc.c
+++ b/drivers/ata/sata_vsc.c
@@ -240,7 +240,7 @@ static void vsc_port_intr(u8 port_status, struct ata_port *ap)
                 return;
         }
 
-        qc = ata_qc_from_tag(ap, ap->active_tag);
+        qc = ata_qc_from_tag(ap, ap->link.active_tag);
         if (qc && likely(!(qc->tf.flags & ATA_TFLAG_POLLING)))
                 handled = ata_host_intr(ap, qc);