From: James Bottomley <James.Bottomley@suse.de>
Date: Wed, 18 May 2011 14:20:10 +0000 (+0200)
Subject: block: add proper state guards to __elv_next_request
X-Git-Tag: v2.6.39.1~138
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=294319fea7169f8a4abb48b1e9b3b98c7334e465;p=pandora-kernel.git

block: add proper state guards to __elv_next_request

commit 0a58e077eb600d1efd7e54ad9926a75a39d7f8ae upstream.

blk_cleanup_queue() calls elevator_exit() and after this, we can't
touch the elevator without oopsing.  __elv_next_request() must check
for this state because in the refcounted queue model, we can still
call it after blk_cleanup_queue() has been called.

This was reported as causing an oops attributable to scsi.

Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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