From: Oleg Nesterov <oleg@tv-sign.ru>
Date: Mon, 21 Aug 2006 06:34:15 +0000 (+0200)
Subject: [PATCH] Fix current_io_context() vs set_task_ioprio() race
X-Git-Tag: v2.6.18-rc5~74^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9f83e45eb54fc7198dc59fc63255341851ba4c48;p=pandora-kernel.git

[PATCH] Fix current_io_context() vs set_task_ioprio() race

I know nothing about io scheduler, but I suspect set_task_ioprio() is not safe.

current_io_context() initializes "struct io_context", then sets ->io_context.
set_task_ioprio() running on another cpu may see the changes out of order, so
->set_ioprio(ioc) may use io_context which was not initialized properly.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Jens Axboe <axboe@suse.de>
---

Reading git-diff-tree failed