diff options
Diffstat (limited to 'drivers/media/usb/uvc/uvc_v4l2.c')
| -rw-r--r-- | drivers/media/usb/uvc/uvc_v4l2.c | 25 |
1 files changed, 21 insertions, 4 deletions
diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c index b2dc32623a7..378ae02e593 100644 --- a/drivers/media/usb/uvc/uvc_v4l2.c +++ b/drivers/media/usb/uvc/uvc_v4l2.c @@ -498,16 +498,20 @@ static int uvc_v4l2_open(struct file *file) return -ENOMEM; } - if (atomic_inc_return(&stream->dev->users) == 1) { - ret = uvc_status_start(stream->dev); + mutex_lock(&stream->dev->lock); + if (stream->dev->users == 0) { + ret = uvc_status_start(stream->dev, GFP_KERNEL); if (ret < 0) { - atomic_dec(&stream->dev->users); + mutex_unlock(&stream->dev->lock); usb_autopm_put_interface(stream->dev->intf); kfree(handle); return ret; } } + stream->dev->users++; + mutex_unlock(&stream->dev->lock); + v4l2_fh_init(&handle->vfh, stream->vdev); v4l2_fh_add(&handle->vfh); handle->chain = stream->chain; @@ -538,8 +542,10 @@ static int uvc_v4l2_release(struct file *file) kfree(handle); file->private_data = NULL; - if (atomic_dec_return(&stream->dev->users) == 0) + mutex_lock(&stream->dev->lock); + if (--stream->dev->users == 0) uvc_status_stop(stream->dev); + mutex_unlock(&stream->dev->lock); usb_autopm_put_interface(stream->dev->intf); return 0; @@ -994,6 +1000,17 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg) return uvc_query_buffer(&stream->queue, buf); } + case VIDIOC_CREATE_BUFS: + { + struct v4l2_create_buffers *cb = arg; + + ret = uvc_acquire_privileges(handle); + if (ret < 0) + return ret; + + return uvc_create_buffers(&stream->queue, cb); + } + case VIDIOC_QBUF: if (!uvc_has_privileges(handle)) return -EBUSY; |