diff options
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; |