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md/raid5: In ops_run_io, inc nr_pending before calling md_wait_for_blocked_rdev

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commit 1850753d2e upstream.

In ops_run_io(), the call to md_wait_for_blocked_rdev will decrement
nr_pending so we lose the reference we hold on the rdev.
So atomic_inc it first to maintain the reference.

This bug was introduced by commit  73e92e51b7
    md/raid5.  Don't write to known bad block on doubtful devices.

which appeared in 3.0, so patch is suitable for stable kernels since
then.

Signed-off-by: majianpeng <majianpeng@gmail.com>
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
majianpeng 2012-07-03 12:11:54 +10:00 committed by Greg Kroah-Hartman
parent 65c3f18b90
commit 8d93698073
1 changed files with 6 additions and 0 deletions
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6
drivers/md/raid5.c
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@ -583,6 +583,12 @@ static void ops_run_io(struct stripe_head *sh, struct stripe_head_state *s)
* a chance*/
md_check_recovery(conf->mddev);
}
/*
* Because md_wait_for_blocked_rdev
* will dec nr_pending, we must
* increment it first.
*/
atomic_inc(&rdev->nr_pending);
md_wait_for_blocked_rdev(rdev, conf->mddev);
} else {
/* Acknowledged bad block - skip the write */