md: Always set RECOVERY_NEEDED when clearing RECOVERY_FROZEN

md_check_recovery will skip any recovery and also clear
MD_RECOVERY_NEEDED if MD_RECOVERY_FROZEN is set.
So when we clear _FROZEN, we must set _NEEDED and ensure that
md_check_recovery gets run.
Otherwise we could miss out on something that is needed.

In particular, this can make it impossible to remove a
failed device from an array is the  'recovery-needed' processing
didn't happen.
Suitable for stable kernels since 3.13.

Cc: stable@vger.kernel.org (3.13+)
Reported-and-tested-by: Joe Lawrence <joe.lawrence@stratus.com>
Fixes: 30b8feb730f9b9b3c5de02580897da03f59b6b16
Signed-off-by: NeilBrown <neilb@suse.de>

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 4dfa15d..9233c71 100644 (file)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -5121,6 +5121,7 @@ static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
                printk("md: %s still in use.\n",mdname(mddev));
                if (did_freeze) {
                        clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
+                       set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
                        md_wakeup_thread(mddev->thread);
                }
                err = -EBUSY;
@@ -5135,6 +5136,8 @@ static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
                mddev->ro = 1;
                set_disk_ro(mddev->gendisk, 1);
                clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
+               set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
+               md_wakeup_thread(mddev->thread);
                sysfs_notify_dirent_safe(mddev->sysfs_state);
                err = 0;
        }
@@ -5178,6 +5181,7 @@ static int do_md_stop(struct mddev *mddev, int mode,
                mutex_unlock(&mddev->open_mutex);
                if (did_freeze) {
                        clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
+                       set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
                        md_wakeup_thread(mddev->thread);
                }
                return -EBUSY;