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V4L/DVB (8022): saa7134: fix race between opening and closing the device

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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>
This commit is contained in:
Marcin Slusarz 2008-06-10 15:18:16 -03:00 committed by Mauro Carvalho Chehab
parent a14fe9605b
commit 913f5fc209
1 changed files with 2 additions and 1 deletions
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3
drivers/media/video/saa7134/saa7134-empress.c
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@ -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;
}