1 files changed, 23 insertions, 4 deletions

diff --git a/drivers/md/raid6main.c b/drivers/md/raid6main.c
index eae5a35629c5..0000d162d198 100644
--- a/drivers/md/raid6main.c
+++ b/drivers/md/raid6main.c
@@ -1702,6 +1702,8 @@ static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, i
         int data_disks = raid_disks - 2;
         sector_t max_sector = mddev->size << 1;
         int sync_blocks;
+        int still_degraded = 0;
+        int i;
 
         if (sector_nr >= max_sector) {
                 /* just being told to finish up .. nothing much to do */
@@ -1710,7 +1712,7 @@ static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, i
                 if (mddev->curr_resync < max_sector) /* aborted */
                         bitmap_end_sync(mddev->bitmap, mddev->curr_resync,
                                         &sync_blocks, 1);
-                else /* compelted sync */
+                else /* completed sync */
                         conf->fullsync = 0;
                 bitmap_close_sync(mddev->bitmap);
 
@@ -1748,7 +1750,16 @@ static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, i
                  */
                 schedule_timeout_uninterruptible(1);
         }
-        bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 0);
+        /* Need to check if array will still be degraded after recovery/resync
+         * We don't need to check the 'failed' flag as when that gets set,
+         * recovery aborts.
+         */
+        for (i=0; i<mddev->raid_disks; i++)
+                if (conf->disks[i].rdev == NULL)
+                        still_degraded = 1;
+
+        bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, still_degraded);
+
         spin_lock(&sh->lock);
         set_bit(STRIPE_SYNCING, &sh->state);
         clear_bit(STRIPE_INSYNC, &sh->state);
@@ -1784,7 +1795,9 @@ static void raid6d (mddev_t *mddev)
 
                 if (conf->seq_flush - conf->seq_write > 0) {
                         int seq = conf->seq_flush;
+                        spin_unlock_irq(&conf->device_lock);
                         bitmap_unplug(mddev->bitmap);
+                        spin_lock_irq(&conf->device_lock);
                         conf->seq_write = seq;
                         activate_bit_delay(conf);
                 }
@@ -2145,9 +2158,15 @@ static int raid6_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
                 /* no point adding a device */
                 return 0;
         /*
-         * find the disk ...
+         * find the disk ... but prefer rdev->saved_raid_disk
+         * if possible.
          */
-        for (disk=0; disk < mddev->raid_disks; disk++)
+        if (rdev->saved_raid_disk >= 0 &&
+            conf->disks[rdev->saved_raid_disk].rdev == NULL)
+                disk = rdev->saved_raid_disk;
+        else
+                disk = 0;
+        for ( ; disk < mddev->raid_disks; disk++)
                 if ((p=conf->disks + disk)->rdev == NULL) {
                         clear_bit(In_sync, &rdev->flags);
                         rdev->raid_disk = disk;