From: Simon Arlott <simon@fire.lp0.eu>
Date: Sat, 10 Mar 2007 09:21:25 +0000 (-0300)
Subject: V4L/DVB (5400): Core: fix several locking related problems
X-Git-Tag: v2.6.21-rc6~85^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c278850206fd9df0bb62a72ca0b277fe20c5a452;p=pandora-kernel.git

V4L/DVB (5400): Core: fix several locking related problems

Fix several instances of dvb-core functions using mutex_lock_interruptible
and returning -ERESTARTSYS where the calling function will either never
retry or never check the return value.
These cause a race condition with dvb_dmxdev_filter_free and
dvb_dvr_release, both of which are filesystem release functions whose
return value is ignored and will never be retried.  When this happens it
becomes impossible to open dvr0 again (-EBUSY) since it has not been
released properly.

Signed-off-by: Simon Arlott <simon@fire.lp0.eu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-By: Johannes Stezenbach <js@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
---

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