tree 506c8fef4d84f54e76b533756cff86c45bb61746
parent 8ed3a19563b6c05b7625649b1769ddb063d53253
author NeilBrown <neilb@suse.de> 1204669775 -0800
committer Linus Torvalds <torvalds@woody.linux-foundation.org> 1204677318 -0800

md: fix possible raid1/raid10 deadlock on read error during resync

Thanks to K.Tanaka and the scsi fault injection framework, here is a fix for
another possible deadlock in raid1/raid10 error handing.

If a read request returns an error while a resync is happening and a resync
request is pending, the attempt to fix the error will block until the resync
progresses, and the resync will block until the read request completes.  Thus
a deadlock.

This patch fixes the problem.

Cc: "K.Tanaka" <k-tanaka@ce.jp.nec.com>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>