1 files changed, 24 insertions, 11 deletions

diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index 5d687d7cffae..32da9a93ce44 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -603,13 +603,13 @@ void ata_scsi_error(struct Scsi_Host *host)
 			ata_link_for_each_dev(dev, link) {
 				int devno = dev->devno;
 
+				if (!ata_dev_enabled(dev))
+					continue;
+
 				ehc->saved_xfer_mode[devno] = dev->xfer_mode;
 				if (ata_ncq_enabled(dev))
 					ehc->saved_ncq_enabled |= 1 << devno;
 			}
-
-			/* set last reset timestamp to some time in the past */
-			ehc->last_reset = jiffies - 60 * HZ;
 		}
 
 		ap->pflags |= ATA_PFLAG_EH_IN_PROGRESS;
@@ -1161,6 +1161,7 @@ void ata_eh_detach_dev(struct ata_device *dev)
 {
 	struct ata_link *link = dev->link;
 	struct ata_port *ap = link->ap;
+	struct ata_eh_context *ehc = &link->eh_context;
 	unsigned long flags;
 
 	ata_dev_disable(dev);
@@ -1174,9 +1175,11 @@ void ata_eh_detach_dev(struct ata_device *dev)
 		ap->pflags |= ATA_PFLAG_SCSI_HOTPLUG;
 	}
 
-	/* clear per-dev EH actions */
+	/* clear per-dev EH info */
 	ata_eh_clear_action(link, dev, &link->eh_info, ATA_EH_PERDEV_MASK);
 	ata_eh_clear_action(link, dev, &link->eh_context.i, ATA_EH_PERDEV_MASK);
+	ehc->saved_xfer_mode[dev->devno] = 0;
+	ehc->saved_ncq_enabled &= ~(1 << dev->devno);
 
 	spin_unlock_irqrestore(ap->lock, flags);
 }
@@ -2275,17 +2278,21 @@ int ata_eh_reset(struct ata_link *link, int classify,
 	if (link->flags & ATA_LFLAG_NO_SRST)
 		softreset = NULL;
 
-	now = jiffies;
-	deadline = ata_deadline(ehc->last_reset, ATA_EH_RESET_COOL_DOWN);
-	if (time_before(now, deadline))
-		schedule_timeout_uninterruptible(deadline - now);
+	/* make sure each reset attemp is at least COOL_DOWN apart */
+	if (ehc->i.flags & ATA_EHI_DID_RESET) {
+		now = jiffies;
+		WARN_ON(time_after(ehc->last_reset, now));
+		deadline = ata_deadline(ehc->last_reset,
+					ATA_EH_RESET_COOL_DOWN);
+		if (time_before(now, deadline))
+			schedule_timeout_uninterruptible(deadline - now);
+	}
 
 	spin_lock_irqsave(ap->lock, flags);
 	ap->pflags |= ATA_PFLAG_RESETTING;
 	spin_unlock_irqrestore(ap->lock, flags);
 
 	ata_eh_about_to_do(link, NULL, ATA_EH_RESET);
-	ehc->last_reset = jiffies;
 
 	ata_link_for_each_dev(dev, link) {
 		/* If we issue an SRST then an ATA drive (not ATAPI)
@@ -2373,7 +2380,6 @@ int ata_eh_reset(struct ata_link *link, int classify,
 	/*
 	 * Perform reset
 	 */
-	ehc->last_reset = jiffies;
 	if (ata_is_host_link(link))
 		ata_eh_freeze_port(ap);
 
@@ -2385,6 +2391,7 @@ int ata_eh_reset(struct ata_link *link, int classify,
 					reset == softreset ? "soft" : "hard");
 
 		/* mark that this EH session started with reset */
+		ehc->last_reset = jiffies;
 		if (reset == hardreset)
 			ehc->i.flags |= ATA_EHI_DID_HARDRESET;
 		else
@@ -2529,7 +2536,7 @@ int ata_eh_reset(struct ata_link *link, int classify,
 	ata_eh_done(link, NULL, ATA_EH_RESET);
 	if (slave)
 		ata_eh_done(slave, NULL, ATA_EH_RESET);
-	ehc->last_reset = jiffies;
+	ehc->last_reset = jiffies;	/* update to completion time */
 	ehc->i.action |= ATA_EH_REVALIDATE;
 
 	rc = 0;
@@ -2787,6 +2794,9 @@ int ata_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
 
 	/* if data transfer is verified, clear DUBIOUS_XFER on ering top */
 	ata_link_for_each_dev(dev, link) {
+		if (!ata_dev_enabled(dev))
+			continue;
+
 		if (!(dev->flags & ATA_DFLAG_DUBIOUS_XFER)) {
 			struct ata_ering_entry *ent;
 
@@ -2808,6 +2818,9 @@ int ata_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
 		u8 saved_xfer_mode = ehc->saved_xfer_mode[dev->devno];
 		u8 saved_ncq = !!(ehc->saved_ncq_enabled & (1 << dev->devno));
 
+		if (!ata_dev_enabled(dev))
+			continue;
+
 		if (dev->xfer_mode != saved_xfer_mode ||
 		    ata_ncq_enabled(dev) != saved_ncq)
 			dev->flags |= ATA_DFLAG_DUBIOUS_XFER;