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authorDevin Heitmueller <dheitmueller@kernellabs.com>2009-05-04 21:43:02 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2009-06-16 19:14:14 -0300
commit57594a586f3353286d64c30f397494a834cac238 (patch)
tree077ba0ba458e51f774f678973b5115115b541fa2 /drivers/media
parent06f837cadbcdedb45f0702cb57c99c404ae921e6 (diff)
V4L/DVB (11785): dvb_frontend: fix race condition resulting in dropped tuning commands
A race condition was detected in the case that putting the tuner to sleep takes an unusually long period of time, combined with applications that quickly close/open the dvb frontend. The kaffeine channel scanner closes and reopens the dvb frontend between each tuning attempt. If it takes an unusually longer period of time to put the tuner to sleep (for example, the Pinnacle 801e takes 660 ms), the dvb_frontend thread will still be in a running state (and hence fepriv->thread is still set) but the fepriv->exit field will still be zero. As a result, if a dvb_frontend_start() call arrives while the frontend thread is in the process of terminating, the call will return 0 without actually starting a new thread. This results in the tuning request being dropped. To address this, mark fepriv->exit as soon as we know the thread is going to be terminated, so that dvb_frontend_start() knows to start a new instance. Problem encountered with Kaffeine 0.8.7 doing ATSC scanning against the Pinnacle 801e tuner, in conjunction with new code to power down the xc5000 when not in use. Signed-off-by: Devin Heitmueller <dheitmueller@kernellabs.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media')
-rw-r--r--drivers/media/dvb/dvb-core/dvb_frontend.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/media/dvb/dvb-core/dvb_frontend.c b/drivers/media/dvb/dvb-core/dvb_frontend.c
index ebc78157b9b..1f38dd86f54 100644
--- a/drivers/media/dvb/dvb-core/dvb_frontend.c
+++ b/drivers/media/dvb/dvb-core/dvb_frontend.c
@@ -543,6 +543,7 @@ restart:
if (kthread_should_stop() || dvb_frontend_is_exiting(fe)) {
/* got signal or quitting */
+ fepriv->exit = 1;
break;
}