Both uvc_start_streaming(), and uvc_stop_streaming() are called from
userspace context, with interrupts enabled. As such, they do not need to
save the IRQ state, and can use spin_lock_irq() and spin_unlock_irq()
respectively.
Signed-off-by: Kieran Bingham <kieran.bingham@xxxxxxxxxxxxxxxx>
Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
---
v4:
- Rebase to v4.16 (linux-media/master)
v5:
- Provide lockdep validation
drivers/media/usb/uvc/uvc_queue.c | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)
diff --git a/drivers/media/usb/uvc/uvc_queue.c b/drivers/media/usb/uvc/uvc_queue.c
index adcc4928fae4..fa7059aab49a 100644
--- a/drivers/media/usb/uvc/uvc_queue.c
+++ b/drivers/media/usb/uvc/uvc_queue.c
@@ -169,18 +169,19 @@ static int uvc_start_streaming(struct vb2_queue *vq, unsigned int count)
{
struct uvc_video_queue *queue = vb2_get_drv_priv(vq);
struct uvc_streaming *stream = uvc_queue_to_stream(queue);
- unsigned long flags;
int ret;
+ lockdep_assert_irqs_enabled();
+
queue->buf_used = 0;
ret = uvc_video_enable(stream, 1);
if (ret == 0)
return 0;
- spin_lock_irqsave(&queue->irqlock, flags);
+ spin_lock_irq(&queue->irqlock);
uvc_queue_return_buffers(queue, UVC_BUF_STATE_QUEUED);
- spin_unlock_irqrestore(&queue->irqlock, flags);
+ spin_unlock_irq(&queue->irqlock);
return ret;
}
@@ -188,14 +189,15 @@ static int uvc_start_streaming(struct vb2_queue *vq, unsigned int count)
static void uvc_stop_streaming(struct vb2_queue *vq)
{
struct uvc_video_queue *queue = vb2_get_drv_priv(vq);
- unsigned long flags;
+
+ lockdep_assert_irqs_enabled();
if (vq->type != V4L2_BUF_TYPE_META_CAPTURE)
uvc_video_enable(uvc_queue_to_stream(queue), 0);
- spin_lock_irqsave(&queue->irqlock, flags);
+ spin_lock_irq(&queue->irqlock);
uvc_queue_return_buffers(queue, UVC_BUF_STATE_ERROR);
- spin_unlock_irqrestore(&queue->irqlock, flags);
+ spin_unlock_irq(&queue->irqlock);
}
static const struct vb2_ops uvc_queue_qops = {
--
git-series 0.9.1
