From: Wang Chen <wangchen@cn.fujitsu.com>
Date: Mon, 29 Dec 2008 05:35:11 +0000 (+0800)
Subject: genirq: check chip->ack before calling
X-Git-Tag: v2.6.30-rc1~3^2~10^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=efdc64f0c792ea744bcc9203f35b908e66d42f41;p=pandora-kernel.git

genirq: check chip->ack before calling

Impact: fix theoretical NULL dereference

The generic irq layer doesn't know whether irq_chip has ack routine on some
architectures or not. Upon that, before calling chip->ack, we should check
that it's not NULL.

Signed-off-by: Wang Chen <wangchen@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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