From: Alasdair G Kergon <agk@redhat.com>
Date: Tue, 12 Jul 2005 22:53:03 +0000 (-0700)
Subject: [PATCH] device-mapper multipath: Avoid possible suspension deadlock
X-Git-Tag: v2.6.13-rc3~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=436d41087d047b61f8ab0604dc74fff3240a8933;p=pandora-kernel.git

[PATCH] device-mapper multipath: Avoid possible suspension deadlock

To avoid deadlock when suspending a multipath device after all its paths have
failed, stop queueing any I/O that is about to fail *before* calling
freeze_bdev instead of after.

Instead of setting a multipath 'suspended' flag which would have to be reset
if an error occurs during the process, save the previous queueing state and
leave userspace to restore if it wishes.

Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

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