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authorMarcin Slusarz <marcin.slusarz@gmail.com>2008-06-10 15:18:16 -0300
committerMauro Carvalho Chehab <mchehab@infradead.org>2008-06-26 15:58:46 -0300
commit913f5fc209247b607b1994a710315966f4f9d358 (patch)
treede8ae1f4b58c61a293b91072d9a3ccbbda1d7637
parenta14fe9605bfdfe360b97acc9ef912779eb860507 (diff)
V4L/DVB (8022): saa7134: fix race between opening and closing the device
decrementing dev->empress_users should be done as last action of ts_release, because it sleeps and write access to dev->empress_started is not protected in any way (additionally closing thread could mute audio after opening thread unmuted it) Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
-rw-r--r--drivers/media/video/saa7134/saa7134-empress.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/media/video/saa7134/saa7134-empress.c b/drivers/media/video/saa7134/saa7134-empress.c
index 94b2585bdf5..1c8cd0ef4a6 100644
--- a/drivers/media/video/saa7134/saa7134-empress.c
+++ b/drivers/media/video/saa7134/saa7134-empress.c
@@ -112,7 +112,6 @@ static int ts_release(struct inode *inode, struct file *file)
videobuf_stop(&dev->empress_tsq);
videobuf_mmap_free(&dev->empress_tsq);
- dev->empress_users--;
/* stop the encoder */
ts_reset_encoder(dev);
@@ -121,6 +120,8 @@ static int ts_release(struct inode *inode, struct file *file)
saa_writeb(SAA7134_AUDIO_MUTE_CTRL,
saa_readb(SAA7134_AUDIO_MUTE_CTRL) | (1 << 6));
+ dev->empress_users--;
+
return 0;
}