tree 439ae68737b5bcb5d473b3d12c3d5417f697ccb3
parent b10fece583fdfdb3d2f29b0da3896ec58b8fe122
author Simon Arlott <simon@fire.lp0.eu> 1173518485 -0300
committer Mauro Carvalho Chehab <mchehab@infradead.org> 1174995954 -0300

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>