From: Linus Torvalds <torvalds@woody.linux-foundation.org>
Date: Thu, 24 May 2007 15:37:14 +0000 (-0700)
Subject: Fix crash with irqpoll due to the IRQF_IRQPOLL flag testing
X-Git-Tag: v2.6.22-rc3~19
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=92ea77275b5345c1300433f28689493dc4163f24;p=pandora-kernel.git

Fix crash with irqpoll due to the IRQF_IRQPOLL flag testing

With irqpoll enabled, trying to test the IRQF_IRQPOLL flag in the
actions would cause a NULL pointer dereference if no action was
installed (for example, the driver might have been unloaded with
interrupts still pending).

So be a bit more careful about testing the flag by making sure to test
for that case.

(The actual _change_ is trivial, the patch is more than a one-liner
because I rewrote the testing to also be much more readable.

Original (discarded) bugfix by Bernhard Walle.

Cc: Bernhard Walle <bwalle@suse.de>
Tested-by: Vivek Goyal <vgoyal@in.ibm.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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