From c50c9c1e659d8de9c13441f243e7938413be6e71 Mon Sep 17 00:00:00 2001 From: Kieran Bingham Date: Wed, 3 Jan 2018 12:33:49 -0500 Subject: [PATCH] media: uvcvideo: queue: Simplify spin-lock usage 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 Signed-off-by: Laurent Pinchart Signed-off-by: Mauro Carvalho Chehab --- 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 74f9483..bebf241 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 = { -- 2.7.4