4 files changed, 20 insertions, 37 deletions

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index b517d2493551..e3c7b312287a 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -361,7 +361,7 @@ static const struct pci_device_id ahci_pci_tbl[] = {
         { PCI_VDEVICE(INTEL, 0x27c1), board_ahci }, /* ICH7 */
         { PCI_VDEVICE(INTEL, 0x27c5), board_ahci }, /* ICH7M */
         { PCI_VDEVICE(INTEL, 0x27c3), board_ahci }, /* ICH7R */
-        { PCI_VDEVICE(AL, 0x5288), board_ahci }, /* ULi M5288 */
+        { PCI_VDEVICE(AL, 0x5288), board_ahci_ign_iferr }, /* ULi M5288 */
         { PCI_VDEVICE(INTEL, 0x2681), board_ahci }, /* ESB2 */
         { PCI_VDEVICE(INTEL, 0x2682), board_ahci }, /* ESB2 */
         { PCI_VDEVICE(INTEL, 0x2683), board_ahci }, /* ESB2 */
@@ -586,35 +586,18 @@ static void ahci_power_down(void __iomem *port_mmio, u32 cap)
 {
         u32 cmd, scontrol;
 
-        cmd = readl(port_mmio + PORT_CMD) & ~PORT_CMD_ICC_MASK;
-
-        if (cap & HOST_CAP_SSC) {
-                /* enable transitions to slumber mode */
-                scontrol = readl(port_mmio + PORT_SCR_CTL);
-                if ((scontrol & 0x0f00) > 0x100) {
-                        scontrol &= ~0xf00;
-                        writel(scontrol, port_mmio + PORT_SCR_CTL);
-                }
-
-                /* put device into slumber mode */
-                writel(cmd | PORT_CMD_ICC_SLUMBER, port_mmio + PORT_CMD);
-
-                /* wait for the transition to complete */
-                ata_wait_register(port_mmio + PORT_CMD, PORT_CMD_ICC_SLUMBER,
-                                  PORT_CMD_ICC_SLUMBER, 1, 50);
-        }
+        if (!(cap & HOST_CAP_SSS))
+                return;
 
-        /* put device into listen mode */
-        if (cap & HOST_CAP_SSS) {
-                /* first set PxSCTL.DET to 0 */
-                scontrol = readl(port_mmio + PORT_SCR_CTL);
-                scontrol &= ~0xf;
-                writel(scontrol, port_mmio + PORT_SCR_CTL);
+        /* put device into listen mode, first set PxSCTL.DET to 0 */
+        scontrol = readl(port_mmio + PORT_SCR_CTL);
+        scontrol &= ~0xf;
+        writel(scontrol, port_mmio + PORT_SCR_CTL);
 
-                /* then set PxCMD.SUD to 0 */
-                cmd &= ~PORT_CMD_SPIN_UP;
-                writel(cmd, port_mmio + PORT_CMD);
-        }
+        /* then set PxCMD.SUD to 0 */
+        cmd = readl(port_mmio + PORT_CMD) & ~PORT_CMD_ICC_MASK;
+        cmd &= ~PORT_CMD_SPIN_UP;
+        writel(cmd, port_mmio + PORT_CMD);
 }
 
 static void ahci_init_port(void __iomem *port_mmio, u32 cap,
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 836947da5b14..7cc5a4a910a4 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -372,7 +372,7 @@ struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev,
                 if (cmd->use_sg) {
                         qc->__sg = (struct scatterlist *) cmd->request_buffer;
                         qc->n_elem = cmd->use_sg;
-                } else {
+                } else if (cmd->request_bufflen) {
                         qc->__sg = &qc->sgent;
                         qc->n_elem = 1;
                 }
diff --git a/drivers/ata/sata_nv.c b/drivers/ata/sata_nv.c
index f6d498e1cf80..f7a963eb1f02 100644
--- a/drivers/ata/sata_nv.c
+++ b/drivers/ata/sata_nv.c
@@ -700,7 +700,6 @@ static void 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);
-        int handled;
 
         /* freeze if hotplugged */
         if (unlikely(irq_stat & (NV_INT_ADDED | NV_INT_REMOVED))) {
@@ -719,13 +718,7 @@ static int nv_host_intr(struct ata_port *ap, u8 irq_stat)
         }
 
         /* handle interrupt */
-        handled = ata_host_intr(ap, qc);
-        if (unlikely(!handled)) {
-                /* spurious, clear it */
-                ata_check_status(ap);
-        }
-
-        return 1;
+        return ata_host_intr(ap, qc);
 }
 
 static irqreturn_t nv_adma_interrupt(int irq, void *dev_instance)
@@ -752,6 +745,11 @@ static irqreturn_t nv_adma_interrupt(int irq, void *dev_instance)
                         if (pp->flags & NV_ADMA_PORT_REGISTER_MODE) {
                                 u8 irq_stat = readb(host->mmio_base + NV_INT_STATUS_CK804)
                                         >> (NV_INT_PORT_SHIFT * i);
+                                if(ata_tag_valid(ap->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. */
+                                        irq_stat |= NV_INT_DEV;
                                 handled += nv_host_intr(ap, irq_stat);
                                 continue;
                         }
diff --git a/include/linux/libata.h b/include/linux/libata.h
index e53a13ba7f78..f7f268e38749 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -1149,7 +1149,9 @@ static inline void ata_qc_reinit(struct ata_queued_cmd *qc)
         qc->cursect = qc->cursg = qc->cursg_ofs = 0;
         qc->nsect = 0;
         qc->nbytes = qc->curbytes = 0;
+        qc->n_elem = 0;
         qc->err_mask = 0;
+        qc->pad_len = 0;
 
         ata_tf_init(qc->dev, &qc->tf);