media: atomisp: Fix WARN() when the vb2 start_streaming callback fails

The videobuf2-core expects buffers to be put back in the queued state
when the vb2 start_streaming callback fails. But the atomisp
atomisp_flush_video_pipe() would unconditionally return them to the core
in an error state.

This triggers the following warning in the videobuf2-core:

drivers/media/common/videobuf2/videobuf2-core.c:1652:
	/*
	 * If done_list is not empty, then start_streaming() didn't call
	 * vb2_buffer_done(vb, VB2_BUF_STATE_QUEUED) but STATE_ERROR or
	 * STATE_DONE.
	 */
	WARN_ON(!list_empty(&q->done_list));

Fix this by adding a state argument to atomisp_flush_video_pipe() and use
VB2_BUF_STATE_QUEUED as state when atomisp_start_streaming() fails.
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/staging/media/atomisp/pci/atomisp_cmd.c

@@ -679,7 +679,8 @@ void atomisp_buffer_done(struct ia_css_frame *frame, enum vb2_buffer_state state
 	vb2_buffer_done(&frame->vb.vb2_buf, state);
 }
 
-void atomisp_flush_video_pipe(struct atomisp_video_pipe *pipe, bool warn_on_css_frames)
+void atomisp_flush_video_pipe(struct atomisp_video_pipe *pipe, enum vb2_buffer_state state,
+			      bool warn_on_css_frames)
 {
 	struct ia_css_frame *frame, *_frame;
 	unsigned long irqflags;
@@ -689,15 +690,15 @@ void atomisp_flush_video_pipe(struct atomisp_video_pipe *pipe, bool warn_on_css_
 	list_for_each_entry_safe(frame, _frame, &pipe->buffers_in_css, queue) {
 		if (warn_on_css_frames)
 			dev_warn(pipe->isp->dev, "Warning: CSS frames queued on flush\n");
-		atomisp_buffer_done(frame, VB2_BUF_STATE_ERROR);
+		atomisp_buffer_done(frame, state);
 	}
 
 	list_for_each_entry_safe(frame, _frame, &pipe->activeq, queue)
-		atomisp_buffer_done(frame, VB2_BUF_STATE_ERROR);
+		atomisp_buffer_done(frame, state);
 
 	list_for_each_entry_safe(frame, _frame, &pipe->buffers_waiting_for_param, queue) {
 		pipe->frame_request_config_id[frame->vb.vb2_buf.index] = 0;
-		atomisp_buffer_done(frame, VB2_BUF_STATE_ERROR);
+		atomisp_buffer_done(frame, state);
 	}
 
 	spin_unlock_irqrestore(&pipe->irq_lock, irqflags);
@@ -706,10 +707,10 @@ void atomisp_flush_video_pipe(struct atomisp_video_pipe *pipe, bool warn_on_css_
 /* Returns queued buffers back to video-core */
 void atomisp_flush_bufs_and_wakeup(struct atomisp_sub_device *asd)
 {
-	atomisp_flush_video_pipe(&asd->video_out_capture, false);
-	atomisp_flush_video_pipe(&asd->video_out_vf, false);
-	atomisp_flush_video_pipe(&asd->video_out_preview, false);
-	atomisp_flush_video_pipe(&asd->video_out_video_capture, false);
+	atomisp_flush_video_pipe(&asd->video_out_capture, VB2_BUF_STATE_ERROR, false);
+	atomisp_flush_video_pipe(&asd->video_out_vf, VB2_BUF_STATE_ERROR, false);
+	atomisp_flush_video_pipe(&asd->video_out_preview, VB2_BUF_STATE_ERROR, false);
+	atomisp_flush_video_pipe(&asd->video_out_video_capture, VB2_BUF_STATE_ERROR, false);
 }
 
 /* clean out the parameters that did not apply */

drivers/staging/media/atomisp/pci/atomisp_cmd.h

@@ -57,7 +57,8 @@ struct atomisp_video_pipe *atomisp_to_video_pipe(struct video_device *dev);
 int atomisp_reset(struct atomisp_device *isp);
 int atomisp_buffers_in_css(struct atomisp_video_pipe *pipe);
 void atomisp_buffer_done(struct ia_css_frame *frame, enum vb2_buffer_state state);
-void atomisp_flush_video_pipe(struct atomisp_video_pipe *pipe, bool warn_on_css_frames);
+void atomisp_flush_video_pipe(struct atomisp_video_pipe *pipe, enum vb2_buffer_state state,
+			      bool warn_on_css_frames);
 void atomisp_flush_bufs_and_wakeup(struct atomisp_sub_device *asd);
 void atomisp_clear_css_buffer_counters(struct atomisp_sub_device *asd);
 

drivers/staging/media/atomisp/pci/atomisp_ioctl.c

@@ -1354,7 +1354,7 @@ int atomisp_start_streaming(struct vb2_queue *vq, unsigned int count)
 
 	ret = atomisp_css_start(asd, css_pipe_id, false);
 	if (ret) {
-		atomisp_flush_video_pipe(pipe, true);
+		atomisp_flush_video_pipe(pipe, VB2_BUF_STATE_QUEUED, true);
 		goto out_unlock;
 	}
 
@@ -1530,7 +1530,7 @@ void atomisp_stop_streaming(struct vb2_queue *vq)
 	css_pipe_id = atomisp_get_css_pipe_id(asd);
 	atomisp_css_stop(asd, css_pipe_id, false);
 
-	atomisp_flush_video_pipe(pipe, true);
+	atomisp_flush_video_pipe(pipe, VB2_BUF_STATE_ERROR, true);
 
 	atomisp_subdev_cleanup_pending_events(asd);
 stopsensor: