diff options
| author | Brandon Philips <brandon@ifup.org> | 2008-04-02 18:10:59 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@infradead.org> | 2008-04-24 14:07:57 -0300 |
| commit | aa9dbac426d263b5b86d1684993d18ae187d7588 (patch) | |
| tree | 942a7399e4ea9e2c135d71008461dbd5c3cd11bf /drivers/media/video/vivi.c | |
| parent | cbcb565f74cf01d680f83af531490bb2c5375af0 (diff) | |
| download | linux-aa9dbac426d263b5b86d1684993d18ae187d7588.tar.gz linux-aa9dbac426d263b5b86d1684993d18ae187d7588.tar.bz2 linux-aa9dbac426d263b5b86d1684993d18ae187d7588.zip | |
V4L/DVB (7491): vivi: make vivi openable only once
vivi currently doesn't have the infrastructure to handle being opened more than
one time and will crash if it is. So, make it openable only once.
Signed-off-by: Brandon Philips <bphilips@suse.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Diffstat (limited to 'drivers/media/video/vivi.c')
| -rw-r--r-- | drivers/media/video/vivi.c | 20 |
1 files changed, 18 insertions, 2 deletions
diff --git a/drivers/media/video/vivi.c b/drivers/media/video/vivi.c index 0e623179f8a5..02a232768e3b 100644 --- a/drivers/media/video/vivi.c +++ b/drivers/media/video/vivi.c @@ -164,6 +164,7 @@ struct vivi_dev { struct mutex lock; spinlock_t slock; + struct mutex mutex; int users; @@ -1036,6 +1037,7 @@ static int vivi_open(struct inode *inode, struct file *file) struct vivi_dev *dev; struct vivi_fh *fh; int i; + int retval = 0; printk(KERN_DEBUG "vivi: open called (minor=%d)\n", minor); @@ -1045,9 +1047,15 @@ static int vivi_open(struct inode *inode, struct file *file) return -ENODEV; found: - /* If more than one user, mutex should be added */ + mutex_lock(&dev->mutex); dev->users++; + if (dev->users > 1) { + dev->users--; + retval = -EBUSY; + goto unlock; + } + dprintk(dev, 1, "open minor=%d type=%s users=%d\n", minor, v4l2_type_names[V4L2_BUF_TYPE_VIDEO_CAPTURE], dev->users); @@ -1055,8 +1063,13 @@ found: fh = kzalloc(sizeof(*fh), GFP_KERNEL); if (NULL == fh) { dev->users--; - return -ENOMEM; + retval = -ENOMEM; + goto unlock; } +unlock: + mutex_unlock(&dev->mutex); + if (retval) + return retval; file->private_data = fh; fh->dev = dev; @@ -1128,7 +1141,9 @@ static int vivi_close(struct inode *inode, struct file *file) kfree(fh); + mutex_lock(&dev->mutex); dev->users--; + mutex_unlock(&dev->mutex); dprintk(dev, 1, "close called (minor=%d, users=%d)\n", minor, dev->users); @@ -1243,6 +1258,7 @@ static int __init vivi_init(void) /* initialize locks */ mutex_init(&dev->lock); spin_lock_init(&dev->slock); + mutex_init(&dev->mutex); dev->vidq.timeout.function = vivi_vid_timeout; dev->vidq.timeout.data = (unsigned long)dev; |