diff options
Diffstat (limited to 'drivers/media/usb/stkwebcam/stk-webcam.c')
| -rw-r--r-- | drivers/media/usb/stkwebcam/stk-webcam.c | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/drivers/media/usb/stkwebcam/stk-webcam.c b/drivers/media/usb/stkwebcam/stk-webcam.c index bb524574c838..2f1a09db1135 100644 --- a/drivers/media/usb/stkwebcam/stk-webcam.c +++ b/drivers/media/usb/stkwebcam/stk-webcam.c @@ -610,6 +610,8 @@ static int v4l_stk_open(struct file *fp) if (dev == NULL || !is_present(dev)) return -ENXIO; + if (mutex_lock_interruptible(&dev->lock)) + return -ERESTARTSYS; if (!dev->first_init) stk_camera_write_reg(dev, 0x0, 0x24); else @@ -618,6 +620,7 @@ static int v4l_stk_open(struct file *fp) err = v4l2_fh_open(fp); if (!err) usb_autopm_get_interface(dev->interface); + mutex_unlock(&dev->lock); return err; } @@ -625,6 +628,7 @@ static int v4l_stk_release(struct file *fp) { struct stk_camera *dev = video_drvdata(fp); + mutex_lock(&dev->lock); if (dev->owner == fp) { stk_stop_stream(dev); stk_free_buffers(dev); @@ -635,10 +639,11 @@ static int v4l_stk_release(struct file *fp) if (is_present(dev)) usb_autopm_put_interface(dev->interface); + mutex_unlock(&dev->lock); return v4l2_fh_release(fp); } -static ssize_t v4l_stk_read(struct file *fp, char __user *buf, +static ssize_t stk_read(struct file *fp, char __user *buf, size_t count, loff_t *f_pos) { int i; @@ -699,6 +704,19 @@ static ssize_t v4l_stk_read(struct file *fp, char __user *buf, return count; } +static ssize_t v4l_stk_read(struct file *fp, char __user *buf, + size_t count, loff_t *f_pos) +{ + struct stk_camera *dev = video_drvdata(fp); + int ret; + + if (mutex_lock_interruptible(&dev->lock)) + return -ERESTARTSYS; + ret = stk_read(fp, buf, count, f_pos); + mutex_unlock(&dev->lock); + return ret; +} + static unsigned int v4l_stk_poll(struct file *fp, poll_table *wait) { struct stk_camera *dev = video_drvdata(fp); @@ -1183,7 +1201,7 @@ static struct v4l2_file_operations v4l_stk_fops = { .read = v4l_stk_read, .poll = v4l_stk_poll, .mmap = v4l_stk_mmap, - .ioctl = video_ioctl2, + .unlocked_ioctl = video_ioctl2, }; static const struct v4l2_ioctl_ops v4l_stk_ioctl_ops = { @@ -1231,6 +1249,7 @@ static int stk_register_video_device(struct stk_camera *dev) int err; dev->vdev = stk_v4l_data; + dev->vdev.lock = &dev->lock; dev->vdev.debug = debug; dev->vdev.v4l2_dev = &dev->v4l2_dev; set_bit(V4L2_FL_USE_FH_PRIO, &dev->vdev.flags); @@ -1286,6 +1305,7 @@ static int stk_camera_probe(struct usb_interface *interface, dev->v4l2_dev.ctrl_handler = hdl; spin_lock_init(&dev->spinlock); + mutex_init(&dev->lock); init_waitqueue_head(&dev->wait_frame); dev->first_init = 1; /* webcam LED management */ |