media: vsp1: Use lockdep assertions to enforce documented conventions

A few functions have documented locking conventions. Documentation is
nice, but runtime checks are better. Enforce the conventions with
lockdep assertions.

Signed-off-by: Laurent Pinchart <[e-mail]>
Reviewed-by: Jacopo Mondi <[e-mail]>
Reviewed-by: Kieran Bingham <[e-mail]>
Signed-off-by: Hans Verkuil <[e-mail]>

drivers/media/platform/renesas/vsp1/vsp1_dl.c

···
 #include <linux/device.h>
 #include <linux/dma-mapping.h>
 #include <linux/gfp.h>
+#include <linux/lockdep.h>
 #include <linux/refcount.h>
 #include <linux/slab.h>
 #include <linux/workqueue.h>
···
 	struct vsp1_dl_list *dl = NULL;
 	unsigned long flags;
 
+	lockdep_assert_not_held(&dlm->lock);
+
 	spin_lock_irqsave(&dlm->lock, flags);
 
 	if (!list_empty(&dlm->free)) {
···
 
 	if (!dl)
 		return;
+
+	lockdep_assert_held(&dl->dlm->lock);
 
 	/*
 	 * Release any linked display-lists which were chained for a single

drivers/media/platform/renesas/vsp1/vsp1_pipe.c

···
 
 #include <linux/delay.h>
 #include <linux/list.h>
+#include <linux/lockdep.h>
 #include <linux/sched.h>
 #include <linux/wait.h>
 
···
 void vsp1_pipeline_run(struct vsp1_pipeline *pipe)
 {
 	struct vsp1_device *vsp1 = pipe->output->entity.vsp1;
+
+	lockdep_assert_held(&pipe->irqlock);
 
 	if (pipe->state == VSP1_PIPELINE_STOPPED) {
 		vsp1_write(vsp1, VI6_CMD(pipe->output->entity.index),