8 files changed, 100 insertions, 86 deletions

diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c
index 02059e96e6cd..72d0d702d5da 100644
--- a/drivers/ide/ide-io.c
+++ b/drivers/ide/ide-io.c
@@ -907,7 +907,7 @@ repeat:
 
 /*
  * Issue a new request to a drive from hwgroup
- * Caller must have already done spin_lock_irqsave(&ide_lock, ..);
+ * Caller must have already done spin_lock_irqsave(&hwgroup->lock, ..);
  *
  * A hwgroup is a serialized group of IDE interfaces.  Usually there is
  * exactly one hwif (interface) per hwgroup, but buggy controllers (eg. CMD640)
@@ -919,7 +919,7 @@ repeat:
  * possibly along with many other devices.  This is especially common in
  * PCI-based systems with off-board IDE controller cards.
  *
- * The IDE driver uses the single global ide_lock spinlock to protect
+ * The IDE driver uses a per-hwgroup spinlock to protect
  * access to the request queues, and to protect the hwgroup->busy flag.
  *
  * The first thread into the driver for a particular hwgroup sets the
@@ -935,7 +935,7 @@ repeat:
  * will start the next request from the queue.  If no more work remains,
  * the driver will clear the hwgroup->busy flag and exit.
  *
- * The ide_lock (spinlock) is used to protect all access to the
+ * The per-hwgroup spinlock is used to protect all access to the
  * hwgroup->busy flag, but is otherwise not needed for most processing in
  * the driver.  This makes the driver much more friendlier to shared IRQs
  * than previous designs, while remaining 100% (?) SMP safe and capable.
@@ -948,7 +948,7 @@ static void ide_do_request (ide_hwgroup_t *hwgroup, int masked_irq)
         ide_startstop_t startstop;
         int             loops = 0;
 
-        /* caller must own ide_lock */
+        /* caller must own hwgroup->lock */
         BUG_ON(!irqs_disabled());
 
         while (!hwgroup->busy) {
@@ -1070,11 +1070,11 @@ static void ide_do_request (ide_hwgroup_t *hwgroup, int masked_irq)
                  */
                 if (masked_irq != IDE_NO_IRQ && hwif->irq != masked_irq)
                         disable_irq_nosync(hwif->irq);
-                spin_unlock(&ide_lock);
+                spin_unlock(&hwgroup->lock);
                 local_irq_enable_in_hardirq();
                         /* allow other IRQs while we start this request */
                 startstop = start_request(drive, rq);
-                spin_lock_irq(&ide_lock);
+                spin_lock_irq(&hwgroup->lock);
                 if (masked_irq != IDE_NO_IRQ && hwif->irq != masked_irq)
                         enable_irq(hwif->irq);
                 if (startstop == ide_stopped)
@@ -1172,7 +1172,7 @@ void ide_timer_expiry (unsigned long data)
         unsigned long   flags;
         unsigned long   wait = -1;
 
-        spin_lock_irqsave(&ide_lock, flags);
+        spin_lock_irqsave(&hwgroup->lock, flags);
 
         if (((handler = hwgroup->handler) == NULL) ||
             (hwgroup->req_gen != hwgroup->req_gen_timer)) {
@@ -1205,7 +1205,7 @@ void ide_timer_expiry (unsigned long data)
                                         hwgroup->timer.expires  = jiffies + wait;
                                         hwgroup->req_gen_timer = hwgroup->req_gen;
                                         add_timer(&hwgroup->timer);
-                                        spin_unlock_irqrestore(&ide_lock, flags);
+                                        spin_unlock_irqrestore(&hwgroup->lock, flags);
                                         return;
                                 }
                         }
@@ -1215,7 +1215,7 @@ void ide_timer_expiry (unsigned long data)
                          * the handler() function, which means we need to
                          * globally mask the specific IRQ:
                          */
-                        spin_unlock(&ide_lock);
+                        spin_unlock(&hwgroup->lock);
                         hwif  = HWIF(drive);
                         /* disable_irq_nosync ?? */
                         disable_irq(hwif->irq);
@@ -1239,14 +1239,14 @@ void ide_timer_expiry (unsigned long data)
                                                   hwif->tp_ops->read_status(hwif));
                         }
                         drive->service_time = jiffies - drive->service_start;
-                        spin_lock_irq(&ide_lock);
+                        spin_lock_irq(&hwgroup->lock);
                         enable_irq(hwif->irq);
                         if (startstop == ide_stopped)
                                 hwgroup->busy = 0;
                 }
         }
         ide_do_request(hwgroup, IDE_NO_IRQ);
-        spin_unlock_irqrestore(&ide_lock, flags);
+        spin_unlock_irqrestore(&hwgroup->lock, flags);
 }
 
 /**
@@ -1339,14 +1339,13 @@ irqreturn_t ide_intr (int irq, void *dev_id)
 {
         unsigned long flags;
         ide_hwgroup_t *hwgroup = (ide_hwgroup_t *)dev_id;
-        ide_hwif_t *hwif;
+        ide_hwif_t *hwif = hwgroup->hwif;
         ide_drive_t *drive;
         ide_handler_t *handler;
         ide_startstop_t startstop;
         irqreturn_t irq_ret = IRQ_NONE;
 
-        spin_lock_irqsave(&ide_lock, flags);
-        hwif = hwgroup->hwif;
+        spin_lock_irqsave(&hwgroup->lock, flags);
 
         if (!ide_ack_intr(hwif))
                 goto out;
@@ -1416,7 +1415,7 @@ irqreturn_t ide_intr (int irq, void *dev_id)
         hwgroup->handler = NULL;
         hwgroup->req_gen++;
         del_timer(&hwgroup->timer);
-        spin_unlock(&ide_lock);
+        spin_unlock(&hwgroup->lock);
 
         if (hwif->port_ops && hwif->port_ops->clear_irq)
                 hwif->port_ops->clear_irq(drive);
@@ -1427,7 +1426,7 @@ irqreturn_t ide_intr (int irq, void *dev_id)
         /* service this interrupt, may set handler for next interrupt */
         startstop = handler(drive);
 
-        spin_lock_irq(&ide_lock);
+        spin_lock_irq(&hwgroup->lock);
         /*
          * Note that handler() may have set things up for another
          * interrupt to occur soon, but it cannot happen until
@@ -1448,7 +1447,7 @@ irqreturn_t ide_intr (int irq, void *dev_id)
 out_handled:
         irq_ret = IRQ_HANDLED;
 out:
-        spin_unlock_irqrestore(&ide_lock, flags);
+        spin_unlock_irqrestore(&hwgroup->lock, flags);
         return irq_ret;
 }
 
diff --git a/drivers/ide/ide-iops.c b/drivers/ide/ide-iops.c
index c41c3b9b6f02..ad8bd6539283 100644
--- a/drivers/ide/ide-iops.c
+++ b/drivers/ide/ide-iops.c
@@ -835,10 +835,12 @@ static void __ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
 void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
                       unsigned int timeout, ide_expiry_t *expiry)
 {
+        ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
         unsigned long flags;
-        spin_lock_irqsave(&ide_lock, flags);
+
+        spin_lock_irqsave(&hwgroup->lock, flags);
         __ide_set_handler(drive, handler, timeout, expiry);
-        spin_unlock_irqrestore(&ide_lock, flags);
+        spin_unlock_irqrestore(&hwgroup->lock, flags);
 }
 
 EXPORT_SYMBOL(ide_set_handler);
@@ -860,10 +862,11 @@ EXPORT_SYMBOL(ide_set_handler);
 void ide_execute_command(ide_drive_t *drive, u8 cmd, ide_handler_t *handler,
                          unsigned timeout, ide_expiry_t *expiry)
 {
+        ide_hwif_t *hwif = drive->hwif;
+        ide_hwgroup_t *hwgroup = hwif->hwgroup;
         unsigned long flags;
-        ide_hwif_t *hwif = HWIF(drive);
 
-        spin_lock_irqsave(&ide_lock, flags);
+        spin_lock_irqsave(&hwgroup->lock, flags);
         __ide_set_handler(drive, handler, timeout, expiry);
         hwif->tp_ops->exec_command(hwif, cmd);
         /*
@@ -873,19 +876,20 @@ void ide_execute_command(ide_drive_t *drive, u8 cmd, ide_handler_t *handler,
          * FIXME: we could skip this delay with care on non shared devices
          */
         ndelay(400);
-        spin_unlock_irqrestore(&ide_lock, flags);
+        spin_unlock_irqrestore(&hwgroup->lock, flags);
 }
 EXPORT_SYMBOL(ide_execute_command);
 
 void ide_execute_pkt_cmd(ide_drive_t *drive)
 {
         ide_hwif_t *hwif = drive->hwif;
+        ide_hwgroup_t *hwgroup = hwif->hwgroup;
         unsigned long flags;
 
-        spin_lock_irqsave(&ide_lock, flags);
+        spin_lock_irqsave(&hwgroup->lock, flags);
         hwif->tp_ops->exec_command(hwif, ATA_CMD_PACKET);
         ndelay(400);
-        spin_unlock_irqrestore(&ide_lock, flags);
+        spin_unlock_irqrestore(&hwgroup->lock, flags);
 }
 EXPORT_SYMBOL_GPL(ide_execute_pkt_cmd);
 
@@ -1076,22 +1080,16 @@ static void pre_reset(ide_drive_t *drive)
  */
 static ide_startstop_t do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
 {
-        unsigned int unit;
-        unsigned long flags, timeout;
-        ide_hwif_t *hwif;
-        ide_hwgroup_t *hwgroup;
-        struct ide_io_ports *io_ports;
-        const struct ide_tp_ops *tp_ops;
+        ide_hwif_t *hwif = drive->hwif;
+        ide_hwgroup_t *hwgroup = hwif->hwgroup;
+        struct ide_io_ports *io_ports = &hwif->io_ports;
+        const struct ide_tp_ops *tp_ops = hwif->tp_ops;
         const struct ide_port_ops *port_ops;
+        unsigned long flags, timeout;
+        unsigned int unit;
         DEFINE_WAIT(wait);
 
-        spin_lock_irqsave(&ide_lock, flags);
-        hwif = HWIF(drive);
-        hwgroup = HWGROUP(drive);
-
-        io_ports = &hwif->io_ports;
-
-        tp_ops = hwif->tp_ops;
+        spin_lock_irqsave(&hwgroup->lock, flags);
 
         /* We must not reset with running handlers */
         BUG_ON(hwgroup->handler != NULL);
@@ -1106,7 +1104,7 @@ static ide_startstop_t do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
                 hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
                 hwgroup->polling = 1;
                 __ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
-                spin_unlock_irqrestore(&ide_lock, flags);
+                spin_unlock_irqrestore(&hwgroup->lock, flags);
                 return ide_started;
         }
 
@@ -1129,9 +1127,9 @@ static ide_startstop_t do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
                 if (time_before_eq(timeout, now))
                         break;
 
-                spin_unlock_irqrestore(&ide_lock, flags);
+                spin_unlock_irqrestore(&hwgroup->lock, flags);
                 timeout = schedule_timeout_uninterruptible(timeout - now);
-                spin_lock_irqsave(&ide_lock, flags);
+                spin_lock_irqsave(&hwgroup->lock, flags);
         } while (timeout);
         finish_wait(&ide_park_wq, &wait);
 
@@ -1143,7 +1141,7 @@ static ide_startstop_t do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
                 pre_reset(&hwif->drives[unit]);
 
         if (io_ports->ctl_addr == 0) {
-                spin_unlock_irqrestore(&ide_lock, flags);
+                spin_unlock_irqrestore(&hwgroup->lock, flags);
                 ide_complete_drive_reset(drive, -ENXIO);
                 return ide_stopped;
         }
@@ -1179,7 +1177,7 @@ static ide_startstop_t do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
         if (port_ops && port_ops->resetproc)
                 port_ops->resetproc(drive);
 
-        spin_unlock_irqrestore(&ide_lock, flags);
+        spin_unlock_irqrestore(&hwgroup->lock, flags);
         return ide_started;
 }
 
diff --git a/drivers/ide/ide-park.c b/drivers/ide/ide-park.c
index 03b00e57e93f..63d01c55f865 100644
--- a/drivers/ide/ide-park.c
+++ b/drivers/ide/ide-park.c
@@ -7,17 +7,16 @@ DECLARE_WAIT_QUEUE_HEAD(ide_park_wq);
 
 static void issue_park_cmd(ide_drive_t *drive, unsigned long timeout)
 {
+        ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
         struct request_queue *q = drive->queue;
         struct request *rq;
         int rc;
 
         timeout += jiffies;
-        spin_lock_irq(&ide_lock);
+        spin_lock_irq(&hwgroup->lock);
         if (drive->dev_flags & IDE_DFLAG_PARKED) {
-                ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
-                int reset_timer;
+                int reset_timer = time_before(timeout, drive->sleep);
 
-                reset_timer = time_before(timeout, drive->sleep);
                 drive->sleep = timeout;
                 wake_up_all(&ide_park_wq);
                 if (reset_timer && hwgroup->sleeping &&
@@ -26,10 +25,10 @@ static void issue_park_cmd(ide_drive_t *drive, unsigned long timeout)
                         hwgroup->busy = 0;
                         blk_start_queueing(q);
                 }
-                spin_unlock_irq(&ide_lock);
+                spin_unlock_irq(&hwgroup->lock);
                 return;
         }
-        spin_unlock_irq(&ide_lock);
+        spin_unlock_irq(&hwgroup->lock);
 
         rq = blk_get_request(q, READ, __GFP_WAIT);
         rq->cmd[0] = REQ_PARK_HEADS;
@@ -62,20 +61,21 @@ ssize_t ide_park_show(struct device *dev, struct device_attribute *attr,
                       char *buf)
 {
         ide_drive_t *drive = to_ide_device(dev);
+        ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
         unsigned long now;
         unsigned int msecs;
 
         if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD)
                 return -EOPNOTSUPP;
 
-        spin_lock_irq(&ide_lock);
+        spin_lock_irq(&hwgroup->lock);
         now = jiffies;
         if (drive->dev_flags & IDE_DFLAG_PARKED &&
             time_after(drive->sleep, now))
                 msecs = jiffies_to_msecs(drive->sleep - now);
         else
                 msecs = 0;
-        spin_unlock_irq(&ide_lock);
+        spin_unlock_irq(&hwgroup->lock);
 
         return snprintf(buf, 20, "%u\n", msecs);
 }
diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c
index c55bdbd22314..504bc9480e93 100644
--- a/drivers/ide/ide-probe.c
+++ b/drivers/ide/ide-probe.c
@@ -906,7 +906,8 @@ static int ide_init_queue(ide_drive_t *drive)
          *      do not.
          */
 
-        q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
+        q = blk_init_queue_node(do_ide_request, &hwif->hwgroup->lock,
+                                hwif_to_node(hwif));
         if (!q)
                 return 1;
 
@@ -947,7 +948,7 @@ static void ide_add_drive_to_hwgroup(ide_drive_t *drive)
 {
         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
 
-        spin_lock_irq(&ide_lock);
+        spin_lock_irq(&hwgroup->lock);
         if (!hwgroup->drive) {
                 /* first drive for hwgroup. */
                 drive->next = drive;
@@ -957,7 +958,7 @@ static void ide_add_drive_to_hwgroup(ide_drive_t *drive)
                 drive->next = hwgroup->drive->next;
                 hwgroup->drive->next = drive;
         }
-        spin_unlock_irq(&ide_lock);
+        spin_unlock_irq(&hwgroup->lock);
 }
 
 /*
@@ -1002,7 +1003,7 @@ void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
 
         ide_ports[hwif->index] = NULL;
 
-        spin_lock_irq(&ide_lock);
+        spin_lock_irq(&hwgroup->lock);
         /*
          * Remove us from the hwgroup, and free
          * the hwgroup if we were the only member
@@ -1030,7 +1031,7 @@ void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
                 }
                 BUG_ON(hwgroup->hwif == hwif);
         }
-        spin_unlock_irq(&ide_lock);
+        spin_unlock_irq(&hwgroup->lock);
 }
 
 /*
@@ -1092,17 +1093,19 @@ static int init_irq (ide_hwif_t *hwif)
                  * linked list, the first entry is the hwif that owns
                  * hwgroup->handler - do not change that.
                  */
-                spin_lock_irq(&ide_lock);
+                spin_lock_irq(&hwgroup->lock);
                 hwif->next = hwgroup->hwif->next;
                 hwgroup->hwif->next = hwif;
                 BUG_ON(hwif->next == hwif);
-                spin_unlock_irq(&ide_lock);
+                spin_unlock_irq(&hwgroup->lock);
         } else {
                 hwgroup = kmalloc_node(sizeof(*hwgroup), GFP_KERNEL|__GFP_ZERO,
                                        hwif_to_node(hwif));
                 if (hwgroup == NULL)
                         goto out_up;
 
+                spin_lock_init(&hwgroup->lock);
+
                 hwif->hwgroup = hwgroup;
                 hwgroup->hwif = hwif->next = hwif;
 
@@ -1263,20 +1266,21 @@ static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
 static void drive_release_dev (struct device *dev)
 {
         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
+        ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
 
         ide_proc_unregister_device(drive);
 
-        spin_lock_irq(&ide_lock);
+        spin_lock_irq(&hwgroup->lock);
         ide_remove_drive_from_hwgroup(drive);
         kfree(drive->id);
         drive->id = NULL;
         drive->dev_flags &= ~IDE_DFLAG_PRESENT;
         /* Messed up locking ... */
-        spin_unlock_irq(&ide_lock);
+        spin_unlock_irq(&hwgroup->lock);
         blk_cleanup_queue(drive->queue);
-        spin_lock_irq(&ide_lock);
+        spin_lock_irq(&hwgroup->lock);
         drive->queue = NULL;
-        spin_unlock_irq(&ide_lock);
+        spin_unlock_irq(&hwgroup->lock);
 
         complete(&drive->gendev_rel_comp);
 }
diff --git a/drivers/ide/ide.c b/drivers/ide/ide.c
index bca6877ee6a5..41d042053548 100644
--- a/drivers/ide/ide.c
+++ b/drivers/ide/ide.c
@@ -74,9 +74,6 @@ static const u8 ide_hwif_to_major[] = { IDE0_MAJOR, IDE1_MAJOR,
 
 DEFINE_MUTEX(ide_cfg_mtx);
 
-__cacheline_aligned_in_smp DEFINE_SPINLOCK(ide_lock);
-EXPORT_SYMBOL(ide_lock);
-
 static void ide_port_init_devices_data(ide_hwif_t *);
 
 /*
@@ -333,6 +330,7 @@ static int set_pio_mode_abuse(ide_hwif_t *hwif, u8 req_pio)
 static int set_pio_mode(ide_drive_t *drive, int arg)
 {
         ide_hwif_t *hwif = drive->hwif;
+        ide_hwgroup_t *hwgroup = hwif->hwgroup;
         const struct ide_port_ops *port_ops = hwif->port_ops;
 
         if (arg < 0 || arg > 255)
@@ -347,9 +345,9 @@ static int set_pio_mode(ide_drive_t *drive, int arg)
                         unsigned long flags;
 
                         /* take lock for IDE_DFLAG_[NO_]UNMASK/[NO_]IO_32BIT */
-                        spin_lock_irqsave(&ide_lock, flags);
+                        spin_lock_irqsave(&hwgroup->lock, flags);
                         port_ops->set_pio_mode(drive, arg);
-                        spin_unlock_irqrestore(&ide_lock, flags);
+                        spin_unlock_irqrestore(&hwgroup->lock, flags);
                 } else
                         port_ops->set_pio_mode(drive, arg);
         } else {
diff --git a/drivers/ide/umc8672.c b/drivers/ide/umc8672.c
index 1da076e0c917..e29978cf6197 100644
--- a/drivers/ide/umc8672.c
+++ b/drivers/ide/umc8672.c
@@ -107,18 +107,21 @@ static void umc_set_speeds(u8 speeds[])
 static void umc_set_pio_mode(ide_drive_t *drive, const u8 pio)
 {
         ide_hwif_t *hwif = drive->hwif;
-        unsigned long flags;
+        ide_hwgroup_t *mate_hwgroup = hwif->mate ? hwif->mate->hwgroup : NULL;
+        unsigned long uninitialized_var(flags);
 
         printk("%s: setting umc8672 to PIO mode%d (speed %d)\n",
                 drive->name, pio, pio_to_umc[pio]);
-        spin_lock_irqsave(&ide_lock, flags);
-        if (hwif->mate && hwif->mate->hwgroup->handler) {
+        if (mate_hwgroup)
+                spin_lock_irqsave(&mate_hwgroup->lock, flags);
+        if (mate_hwgroup && mate_hwgroup->handler) {
                 printk(KERN_ERR "umc8672: other interface is busy: exiting tune_umc()\n");
         } else {
                 current_speeds[drive->name[2] - 'a'] = pio_to_umc[pio];
                 umc_set_speeds(current_speeds);
         }
-        spin_unlock_irqrestore(&ide_lock, flags);
+        if (mate_hwgroup)
+                spin_unlock_irqrestore(&mate_hwgroup->lock, flags);
 }
 
 static const struct ide_port_ops umc8672_port_ops = {
diff --git a/drivers/scsi/ide-scsi.c b/drivers/scsi/ide-scsi.c
index 2370fd82ebfe..c24140aff8e7 100644
--- a/drivers/scsi/ide-scsi.c
+++ b/drivers/scsi/ide-scsi.c
@@ -578,6 +578,8 @@ static int idescsi_eh_abort (struct scsi_cmnd *cmd)
 {
         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
         ide_drive_t    *drive = scsi->drive;
+        ide_hwif_t     *hwif;
+        ide_hwgroup_t  *hwgroup;
         int             busy;
         int             ret   = FAILED;
 
@@ -594,13 +596,16 @@ static int idescsi_eh_abort (struct scsi_cmnd *cmd)
                 goto no_drive;
         }
 
-        /* First give it some more time, how much is "right" is hard to say :-( */
+        hwif = drive->hwif;
+        hwgroup = hwif->hwgroup;
 
-        busy = ide_wait_not_busy(HWIF(drive), 100);     /* FIXME - uses mdelay which causes latency? */
+        /* First give it some more time, how much is "right" is hard to say :-(
+           FIXME - uses mdelay which causes latency? */
+        busy = ide_wait_not_busy(hwif, 100);
         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
                 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
 
-        spin_lock_irq(&ide_lock);
+        spin_lock_irq(&hwgroup->lock);
 
         /* If there is no pc running we're done (our interrupt took care of it) */
         pc = drive->pc;
@@ -629,7 +634,7 @@ static int idescsi_eh_abort (struct scsi_cmnd *cmd)
         }
 
 ide_unlock:
-        spin_unlock_irq(&ide_lock);
+        spin_unlock_irq(&hwgroup->lock);
 no_drive:
         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
                 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
@@ -642,6 +647,7 @@ static int idescsi_eh_reset (struct scsi_cmnd *cmd)
         struct request *req;
         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
         ide_drive_t    *drive = scsi->drive;
+        ide_hwgroup_t  *hwgroup;
         int             ready = 0;
         int             ret   = SUCCESS;
 
@@ -658,14 +664,18 @@ static int idescsi_eh_reset (struct scsi_cmnd *cmd)
                 return FAILED;
         }
 
+        hwgroup = drive->hwif->hwgroup;
+
         spin_lock_irq(cmd->device->host->host_lock);
-        spin_lock(&ide_lock);
+        spin_lock(&hwgroup->lock);
 
         pc = drive->pc;
+        if (pc)
+                req = pc->rq;
 
-        if (pc == NULL || (req = pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
+        if (pc == NULL || req != hwgroup->rq || hwgroup->handler == NULL) {
                 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
-                spin_unlock(&ide_lock);
+                spin_unlock(&hwgroup->lock);
                 spin_unlock_irq(cmd->device->host->host_lock);
                 return FAILED;
         }
@@ -685,10 +695,10 @@ static int idescsi_eh_reset (struct scsi_cmnd *cmd)
                         BUG();
         }
 
-        HWGROUP(drive)->rq = NULL;
-        HWGROUP(drive)->handler = NULL;
-        HWGROUP(drive)->busy = 1;               /* will set this to zero when ide reset finished */
-        spin_unlock(&ide_lock);
+        hwgroup->rq = NULL;
+        hwgroup->handler = NULL;
+        hwgroup->busy = 1; /* will set this to zero when ide reset finished */
+        spin_unlock(&hwgroup->lock);
 
         ide_do_reset(drive);
 
diff --git a/include/linux/ide.h b/include/linux/ide.h
index 010fb26a1579..c871d325cedb 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -909,6 +909,8 @@ typedef struct hwgroup_s {
 
         int req_gen;
         int req_gen_timer;
+
+        spinlock_t lock;
 } ide_hwgroup_t;
 
 typedef struct ide_driver_s ide_driver_t;
@@ -1610,13 +1612,13 @@ extern struct mutex ide_cfg_mtx;
 /*
  * Structure locking:
  *
- * ide_cfg_mtx and ide_lock together protect changes to
- * ide_hwif_t->{next,hwgroup}
+ * ide_cfg_mtx and hwgroup->lock together protect changes to
+ * ide_hwif_t->next
  * ide_drive_t->next
  *
- * ide_hwgroup_t->busy: ide_lock
- * ide_hwgroup_t->hwif: ide_lock
- * ide_hwif_t->mate: constant, no locking
+ * ide_hwgroup_t->busy: hwgroup->lock
+ * ide_hwgroup_t->hwif: hwgroup->lock
+ * ide_hwif_t->{hwgroup,mate}: constant, no locking
  * ide_drive_t->hwif: constant, no locking
  */