From: Yu Kuai <yukuai3@xxxxxxxxxx>
stop_sync_thread() will interrupt md_do_sync(), and md_do_sync() must
set MD_RECOVERY_DONE, so that follow up md_check_recovery() will
unregister sync_thread, clear MD_RECOVERY_RUNNING and wake up
stop_sync_thread().
Before this patch, if MD_RECOVERY_WAIT is set or the array is read-only,
md_do_sync() will return without setting MD_RECOVERY_DONE, hence use
stop_sync_thread() directly will hang because md_check_recovery() can't
clear MD_RECOVERY_RUNNING, which is possible for dm-raid.
Signed-off-by: Yu Kuai <yukuai3@xxxxxxxxxx>
---
drivers/md/md.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 6906d023f1d6..ba45c7be3dbe 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -8788,12 +8788,13 @@ void md_do_sync(struct md_thread *thread)
int ret;
/* just incase thread restarts... */
- if (test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
- test_bit(MD_RECOVERY_WAIT, &mddev->recovery))
+ if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
return;
- if (!md_is_rdwr(mddev)) {/* never try to sync a read-only array */
+
+ if (test_bit(MD_RECOVERY_WAIT, &mddev->recovery) ||
+ !md_is_rdwr(mddev)) {/* never try to sync a read-only array */
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
- return;
+ goto out;
}
if (mddev_is_clustered(mddev)) {
@@ -9171,6 +9172,7 @@ void md_do_sync(struct md_thread *thread)
mddev->array_sectors);
}
+out:
spin_lock(&mddev->lock);
if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
/* We completed so min/max setting can be forgotten if used. */
--
2.39.2
