4 files changed, 28 insertions, 13 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index c2ff77ccec50..c7aae66c6f9b 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -3483,7 +3483,7 @@ static void md_safemode_timeout(unsigned long data)
         if (!atomic_read(&mddev->writes_pending)) {
                 mddev->safemode = 1;
                 if (mddev->external)
-                        sysfs_notify(&mddev->kobj, NULL, "array_state");
+                        set_bit(MD_NOTIFY_ARRAY_STATE, &mddev->flags);
         }
         md_wakeup_thread(mddev->thread);
 }
@@ -5996,7 +5996,8 @@ static int remove_and_add_spares(mddev_t *mddev)
         if (mddev->degraded) {
                 rdev_for_each(rdev, rtmp, mddev) {
                         if (rdev->raid_disk >= 0 &&
-                            !test_bit(In_sync, &rdev->flags))
+                            !test_bit(In_sync, &rdev->flags) &&
+                            !test_bit(Blocked, &rdev->flags))
                                 spares++;
                         if (rdev->raid_disk < 0
                             && !test_bit(Faulty, &rdev->flags)) {
@@ -6051,6 +6052,9 @@ void md_check_recovery(mddev_t *mddev)
         if (mddev->bitmap)
                 bitmap_daemon_work(mddev->bitmap);
 
+        if (test_and_clear_bit(MD_NOTIFY_ARRAY_STATE, &mddev->flags))
+                sysfs_notify(&mddev->kobj, NULL, "array_state");
+
         if (mddev->ro)
                 return;
 
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 159535d73567..d41bebb6da0f 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -215,6 +215,9 @@ static void reschedule_retry(r10bio_t *r10_bio)
         conf->nr_queued ++;
         spin_unlock_irqrestore(&conf->device_lock, flags);
 
+        /* wake up frozen array... */
+        wake_up(&conf->wait_barrier);
+
         md_wakeup_thread(mddev->thread);
 }
 
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 55e7c56045a0..40e939675657 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -2507,7 +2507,7 @@ static void handle_stripe_expansion(raid5_conf_t *conf, struct stripe_head *sh,
  *
  */
 
-static void handle_stripe5(struct stripe_head *sh)
+static bool handle_stripe5(struct stripe_head *sh)
 {
         raid5_conf_t *conf = sh->raid_conf;
         int disks = sh->disks, i;
@@ -2717,10 +2717,11 @@ static void handle_stripe5(struct stripe_head *sh)
         if (sh->reconstruct_state == reconstruct_state_result) {
                 sh->reconstruct_state = reconstruct_state_idle;
                 clear_bit(STRIPE_EXPANDING, &sh->state);
-                for (i = conf->raid_disks; i--; )
+                for (i = conf->raid_disks; i--; ) {
                         set_bit(R5_Wantwrite, &sh->dev[i].flags);
-                        set_bit(R5_LOCKED, &dev->flags);
+                        set_bit(R5_LOCKED, &sh->dev[i].flags);
                         s.locked++;
+                }
         }
 
         if (s.expanded && test_bit(STRIPE_EXPANDING, &sh->state) &&
@@ -2754,9 +2755,11 @@ static void handle_stripe5(struct stripe_head *sh)
         ops_run_io(sh, &s);
 
         return_io(return_bi);
+
+        return blocked_rdev == NULL;
 }
 
-static void handle_stripe6(struct stripe_head *sh, struct page *tmp_page)
+static bool handle_stripe6(struct stripe_head *sh, struct page *tmp_page)
 {
         raid6_conf_t *conf = sh->raid_conf;
         int disks = sh->disks;
@@ -2967,14 +2970,17 @@ static void handle_stripe6(struct stripe_head *sh, struct page *tmp_page)
         ops_run_io(sh, &s);
 
         return_io(return_bi);
+
+        return blocked_rdev == NULL;
 }
 
-static void handle_stripe(struct stripe_head *sh, struct page *tmp_page)
+/* returns true if the stripe was handled */
+static bool handle_stripe(struct stripe_head *sh, struct page *tmp_page)
 {
         if (sh->raid_conf->level == 6)
-                handle_stripe6(sh, tmp_page);
+                return handle_stripe6(sh, tmp_page);
         else
-                handle_stripe5(sh);
+                return handle_stripe5(sh);
 }
 
 
@@ -3692,7 +3698,9 @@ static inline sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *ski
         clear_bit(STRIPE_INSYNC, &sh->state);
         spin_unlock(&sh->lock);
 
-        handle_stripe(sh, NULL);
+        /* wait for any blocked device to be handled */
+        while(unlikely(!handle_stripe(sh, NULL)))
+                ;
         release_stripe(sh);
 
         return STRIPE_SECTORS;
@@ -3811,10 +3819,8 @@ static void raid5d(mddev_t *mddev)
 
                 sh = __get_priority_stripe(conf);
 
-                if (!sh) {
-                        async_tx_issue_pending_all();
+                if (!sh)
                         break;
-                }
                 spin_unlock_irq(&conf->device_lock);
                 
                 handled++;
@@ -3827,6 +3833,7 @@ static void raid5d(mddev_t *mddev)
 
         spin_unlock_irq(&conf->device_lock);
 
+        async_tx_issue_pending_all();
         unplug_slaves(mddev);
 
         pr_debug("--- raid5d inactive\n");
diff --git a/include/linux/raid/md_k.h b/include/linux/raid/md_k.h
index 9f2549ac0e2d..c200b9a34aff 100644
--- a/include/linux/raid/md_k.h
+++ b/include/linux/raid/md_k.h
@@ -128,6 +128,7 @@ struct mddev_s
 #define MD_CHANGE_DEVS  0       /* Some device status has changed */
 #define MD_CHANGE_CLEAN 1       /* transition to or from 'clean' */
 #define MD_CHANGE_PENDING 2     /* superblock update in progress */
+#define MD_NOTIFY_ARRAY_STATE 3 /* atomic context wants to notify userspace */
 
         int                             ro;