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| author | Dan Williams <dan.j.williams@intel.com> | 2010-08-07 03:01:59 +0200 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2010-08-08 13:20:17 +0200 |
| commit | 147e0b6a639ac581ca3bf627bedc3f4a6d3eca66 (patch) | |
| tree | 95ca7cb3b2f06586d678ec33c0e9910d11f3af42 | |
| parent | md/raid10: fix deadlock with unaligned read during resync (diff) | |
| download | linux-147e0b6a639ac581ca3bf627bedc3f4a6d3eca66.tar.xz linux-147e0b6a639ac581ca3bf627bedc3f4a6d3eca66.zip | |
md: move revalidate_disk() back outside open_mutex
Commit b821eaa5 "md: remove ->changed and related code" moved
revalidate_disk() under open_mutex, and lockdep noticed.
[ INFO: possible circular locking dependency detected ]
2.6.32-mdadm-locking #1
-------------------------------------------------------
mdadm/3640 is trying to acquire lock:
(&bdev->bd_mutex){+.+.+.}, at: [<ffffffff811acecb>] revalidate_disk+0x5b/0x90
but task is already holding lock:
(&mddev->open_mutex){+.+...}, at: [<ffffffffa055e07a>] do_md_stop+0x4a/0x4d0 [md_mod]
which lock already depends on the new lock.
It is suitable for 2.6.35.x
Cc: <stable@kernel.org>
Reported-by: Przemyslaw Czarnowski <przemyslaw.hawrylewicz.czarnowski@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
| -rw-r--r-- | drivers/md/md.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c index 40b7ca0294ac..00c3fde39a12 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -4765,7 +4765,7 @@ out: */ static int do_md_stop(mddev_t * mddev, int mode, int is_open) { - int err = 0; + int err = 0, revalidate = 0; struct gendisk *disk = mddev->gendisk; mdk_rdev_t *rdev; @@ -4795,7 +4795,7 @@ static int do_md_stop(mddev_t * mddev, int mode, int is_open) } set_capacity(disk, 0); - revalidate_disk(disk); + revalidate = 1; if (mddev->ro) mddev->ro = 0; @@ -4803,6 +4803,8 @@ static int do_md_stop(mddev_t * mddev, int mode, int is_open) err = 0; } mutex_unlock(&mddev->open_mutex); + if (revalidate) + revalidate_disk(disk); if (err) return err; /* |