From: Greg Kroah-Hartman <gregkh@suse.de>
Date: Thu, 15 May 2008 20:44:08 +0000 (-0700)
Subject: mm: bdi: fix race in bdi_class device creation
X-Git-Tag: v2.6.26-rc4~94^2~11
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=19051c5035d217e572672a2ca9db06c1cef50e9b;p=pandora-kernel.git

mm: bdi: fix race in bdi_class device creation

There is a race from when a device is created with device_create() and
then the drvdata is set with a call to dev_set_drvdata() in which a
sysfs file could be open, yet the drvdata will be NULL, causing all
sorts of bad things to happen.

This patch fixes the problem by using the new function,
device_create_vargs().

Many thanks to Arthur Jones <ajones@riverbed.com> for reporting the bug,
and testing patches out.

Cc: Kay Sievers <kay.sievers@vrfy.org>
Cc: Arthur Jones <ajones@riverbed.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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