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| author | Mikulas Patocka <mpatocka@redhat.com> | 2020-07-23 16:42:09 +0200 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2020-07-23 20:39:37 +0200 |
| commit | 5df96f2b9f58a5d2dc1f30fe7de75e197f2c25f2 (patch) | |
| tree | 70d70eb0c263e130f3ec662cc6c1248cc8da77e6 /drivers/md/dm-integrity.c | |
| parent | dm: use noio when sending kobject event (diff) | |
| download | linux-5df96f2b9f58a5d2dc1f30fe7de75e197f2c25f2.tar.xz linux-5df96f2b9f58a5d2dc1f30fe7de75e197f2c25f2.zip | |
dm integrity: fix integrity recalculation that is improperly skipped
Commit adc0daad366b62ca1bce3e2958a40b0b71a8b8b3 ("dm: report suspended
device during destroy") broke integrity recalculation.
The problem is dm_suspended() returns true not only during suspend,
but also during resume. So this race condition could occur:
1. dm_integrity_resume calls queue_work(ic->recalc_wq, &ic->recalc_work)
2. integrity_recalc (&ic->recalc_work) preempts the current thread
3. integrity_recalc calls if (unlikely(dm_suspended(ic->ti))) goto unlock_ret;
4. integrity_recalc exits and no recalculating is done.
To fix this race condition, add a function dm_post_suspending that is
only true during the postsuspend phase and use it instead of
dm_suspended().
Signed-off-by: Mikulas Patocka <mpatocka redhat com>
Fixes: adc0daad366b ("dm: report suspended device during destroy")
Cc: stable vger kernel org # v4.18+
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md/dm-integrity.c')
| -rw-r--r-- | drivers/md/dm-integrity.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/md/dm-integrity.c b/drivers/md/dm-integrity.c index 81dc5ff08909..a83a1de1e03f 100644 --- a/drivers/md/dm-integrity.c +++ b/drivers/md/dm-integrity.c @@ -2420,7 +2420,7 @@ static void integrity_writer(struct work_struct *w) unsigned prev_free_sectors; /* the following test is not needed, but it tests the replay code */ - if (unlikely(dm_suspended(ic->ti)) && !ic->meta_dev) + if (unlikely(dm_post_suspending(ic->ti)) && !ic->meta_dev) return; spin_lock_irq(&ic->endio_wait.lock); @@ -2481,7 +2481,7 @@ static void integrity_recalc(struct work_struct *w) next_chunk: - if (unlikely(dm_suspended(ic->ti))) + if (unlikely(dm_post_suspending(ic->ti))) goto unlock_ret; range.logical_sector = le64_to_cpu(ic->sb->recalc_sector); |