From: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Date: Tue, 18 Apr 2006 17:18:31 +0000 (+0200)
Subject: [PATCH] cfq: Further rbtree traversal and cfq_exit_queue() race fix
X-Git-Tag: v2.6.17-rc2~15^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=be3b075354e170368a0d29558cae492205e80a64;p=pandora-kernel.git

[PATCH] cfq: Further rbtree traversal and cfq_exit_queue() race fix

In current code, we are re-reading cic->key after dead cic->key check.
So, in theory, it may really re-read *after* cfq_exit_queue() seted NULL.

To avoid race, we copy it to stack, then use it. With this change, I
guess gcc will assign cic->key to a register or stack, and it wouldn't
be re-readed.

Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Jens Axboe <axboe@suse.de>
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