From: Ming Lei <ming.lei@canonical.com>
Date: Fri, 22 Jun 2012 10:01:40 +0000 (+0800)
Subject: driver core: fix shutdown races with probe/remove(v3)
X-Git-Tag: v3.6-rc1~99^2~14^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d1c6c030fcec6f860d9bb6c632a3ebe62e28440b;p=pandora-kernel.git

driver core: fix shutdown races with probe/remove(v3)

Firstly, .shutdown callback may touch a uninitialized hardware
if dev->driver is set and .probe is not completed.

Secondly, device_shutdown() may dereference a null pointer to cause
oops when dev->driver is cleared after it has been checked in
device_shutdown().

So just hold device lock and its parent lock(if it has) to
fix the races.

Cc: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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