From 661112cb7e343c36d8d7899c1c9e6d37271aafd4 Mon Sep 17 00:00:00 2001 From: Laurent Pinchart Date: Mon, 9 Dec 2013 11:36:51 -0300 Subject: [media] omap3isp: Cancel streaming when a fatal error occurs When a fatal error that prevents any further video streaming occurs in a pipeline, all queued buffers must be marked as erroneous and new buffers must be prevented from being queued. Implement this behaviour with a new omap3isp_pipeline_cancel_stream() function that can be used by submodules to cancel streaming. Signed-off-by: Laurent Pinchart Acked-by: Sakari Ailus Signed-off-by: Mauro Carvalho Chehab --- drivers/media/platform/omap3isp/ispvideo.c | 46 ++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) (limited to 'drivers/media/platform/omap3isp/ispvideo.c') diff --git a/drivers/media/platform/omap3isp/ispvideo.c b/drivers/media/platform/omap3isp/ispvideo.c index 3953aec7c5c5..856fdf554035 100644 --- a/drivers/media/platform/omap3isp/ispvideo.c +++ b/drivers/media/platform/omap3isp/ispvideo.c @@ -411,6 +411,15 @@ static int isp_video_buffer_prepare(struct isp_video_buffer *buf) struct isp_video *video = vfh->video; unsigned long addr; + /* Refuse to prepare the buffer is the video node has registered an + * error. We don't need to take any lock here as the operation is + * inherently racy. The authoritative check will be performed in the + * queue handler, which can't return an error, this check is just a best + * effort to notify userspace as early as possible. + */ + if (unlikely(video->error)) + return -EIO; + addr = ispmmu_vmap(video->isp, buf->sglist, buf->sglen); if (IS_ERR_VALUE(addr)) return -EIO; @@ -447,6 +456,12 @@ static void isp_video_buffer_queue(struct isp_video_buffer *buf) unsigned int empty; unsigned int start; + if (unlikely(video->error)) { + buf->state = ISP_BUF_STATE_ERROR; + wake_up(&buf->wait); + return; + } + empty = list_empty(&video->dmaqueue); list_add_tail(&buffer->buffer.irqlist, &video->dmaqueue); @@ -568,6 +583,36 @@ struct isp_buffer *omap3isp_video_buffer_next(struct isp_video *video) return to_isp_buffer(buf); } +/* + * omap3isp_video_cancel_stream - Cancel stream on a video node + * @video: ISP video object + * + * Cancelling a stream mark all buffers on the video node as erroneous and makes + * sure no new buffer can be queued. + */ +void omap3isp_video_cancel_stream(struct isp_video *video) +{ + struct isp_video_queue *queue = video->queue; + unsigned long flags; + + spin_lock_irqsave(&queue->irqlock, flags); + + while (!list_empty(&video->dmaqueue)) { + struct isp_video_buffer *buf; + + buf = list_first_entry(&video->dmaqueue, + struct isp_video_buffer, irqlist); + list_del(&buf->irqlist); + + buf->state = ISP_BUF_STATE_ERROR; + wake_up(&buf->wait); + } + + video->error = true; + + spin_unlock_irqrestore(&queue->irqlock, flags); +} + /* * omap3isp_video_resume - Perform resume operation on the buffers * @video: ISP video object @@ -1105,6 +1150,7 @@ isp_video_streamoff(struct file *file, void *fh, enum v4l2_buf_type type) omap3isp_video_queue_streamoff(&vfh->queue); video->queue = NULL; video->streaming = 0; + video->error = false; if (video->isp->pdata->set_constraints) video->isp->pdata->set_constraints(video->isp, false); -- cgit v1.2.3