1 files changed, 41 insertions, 17 deletions

diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index b3f7d3c8ae60..8256655ce7d9 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -50,6 +50,28 @@ enum {
         ATA_EH_SPDN_FALLBACK_TO_PIO     = (1 << 2),
 };
 
+/* Waiting in ->prereset can never be reliable.  It's sometimes nice
+ * to wait there but it can't be depended upon; otherwise, we wouldn't
+ * be resetting.  Just give it enough time for most drives to spin up.
+ */
+enum {
+        ATA_EH_PRERESET_TIMEOUT         = 10 * HZ,
+};
+
+/* The following table determines how we sequence resets.  Each entry
+ * represents timeout for that try.  The first try can be soft or
+ * hardreset.  All others are hardreset if available.  In most cases
+ * the first reset w/ 10sec timeout should succeed.  Following entries
+ * are mostly for error handling, hotplug and retarded devices.
+ */
+static const unsigned long ata_eh_reset_timeouts[] = {
+        10 * HZ,        /* most drives spin up by 10sec */
+        10 * HZ,        /* > 99% working drives spin up before 20sec */
+        35 * HZ,        /* give > 30 secs of idleness for retarded devices */
+        5 * HZ,         /* and sweet one last chance */
+        /* > 1 min has elapsed, give up */
+};
+
 static void __ata_port_freeze(struct ata_port *ap);
 static void ata_eh_finish(struct ata_port *ap);
 #ifdef CONFIG_PM
@@ -1603,8 +1625,9 @@ static int ata_eh_reset(struct ata_port *ap, int classify,
 {
         struct ata_eh_context *ehc = &ap->eh_context;
         unsigned int *classes = ehc->classes;
-        int tries = ATA_EH_RESET_TRIES;
         int verbose = !(ehc->i.flags & ATA_EHI_QUIET);
+        int try = 0;
+        unsigned long deadline;
         unsigned int action;
         ata_reset_fn_t reset;
         int i, did_followup_srst, rc;
@@ -1624,7 +1647,7 @@ static int ata_eh_reset(struct ata_port *ap, int classify,
                 ehc->i.action |= ATA_EH_HARDRESET;
 
         if (prereset) {
-                rc = prereset(ap, jiffies + 40 * HZ);
+                rc = prereset(ap, jiffies + ATA_EH_PRERESET_TIMEOUT);
                 if (rc) {
                         if (rc == -ENOENT) {
                                 ata_port_printk(ap, KERN_DEBUG,
@@ -1665,6 +1688,8 @@ static int ata_eh_reset(struct ata_port *ap, int classify,
         }
 
  retry:
+        deadline = jiffies + ata_eh_reset_timeouts[try++];
+
         /* shut up during boot probing */
         if (verbose)
                 ata_port_printk(ap, KERN_INFO, "%s resetting port\n",
@@ -1676,7 +1701,7 @@ static int ata_eh_reset(struct ata_port *ap, int classify,
         else
                 ehc->i.flags |= ATA_EHI_DID_SOFTRESET;
 
-        rc = ata_do_reset(ap, reset, classes, jiffies + 40 * HZ);
+        rc = ata_do_reset(ap, reset, classes, deadline);
 
         did_followup_srst = 0;
         if (reset == hardreset &&
@@ -1693,7 +1718,7 @@ static int ata_eh_reset(struct ata_port *ap, int classify,
                 }
 
                 ata_eh_about_to_do(ap, NULL, ATA_EH_RESET_MASK);
-                rc = ata_do_reset(ap, reset, classes, jiffies + 40 * HZ);
+                rc = ata_do_reset(ap, reset, classes, deadline);
 
                 if (rc == 0 && classify &&
                     classes[0] == ATA_DEV_UNKNOWN) {
@@ -1703,22 +1728,21 @@ static int ata_eh_reset(struct ata_port *ap, int classify,
                 }
         }
 
-        if (rc && --tries) {
-                const char *type;
+        if (rc && try < ARRAY_SIZE(ata_eh_reset_timeouts)) {
+                unsigned long now = jiffies;
 
-                if (reset == softreset) {
-                        if (did_followup_srst)
-                                type = "follow-up soft";
-                        else
-                                type = "soft";
-                } else
-                        type = "hard";
+                if (time_before(now, deadline)) {
+                        unsigned long delta = deadline - jiffies;
 
-                ata_port_printk(ap, KERN_WARNING,
-                                "%sreset failed, retrying in 5 secs\n", type);
-                ssleep(5);
+                        ata_port_printk(ap, KERN_WARNING, "reset failed "
+                                "(errno=%d), retrying in %u secs\n",
+                                rc, (jiffies_to_msecs(delta) + 999) / 1000);
+
+                        schedule_timeout_uninterruptible(delta);
+                }
 
-                if (reset == hardreset)
+                if (reset == hardreset &&
+                    try == ARRAY_SIZE(ata_eh_reset_timeouts) - 1)
                         sata_down_spd_limit(ap);
                 if (hardreset)
                         reset = hardreset;