[media] vb2: stop_streaming should return void

The vb2 core ignores any return code from the stop_streaming op.
And there really isn't anything it can do anyway in case of an error.
So change the return type to void and update any drivers that implement it.

The int return gave drivers the idea that this operation could actually
fail, but that's really not the case.

The pwc amd sdr-msi3101 drivers both had this construction:

        if (mutex_lock_interruptible(&s->v4l2_lock))
                return -ERESTARTSYS;

This has been updated to just call mutex_lock(). The stop_streaming op
expects this to really stop streaming and I very much doubt this will
work reliably if stop_streaming just returns without really stopping the
DMA.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Pawel Osciak <pawel@osciak.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

5 files changed, 7 insertions, 15 deletions

diff --git a/drivers/media/platform/soc_camera/atmel-isi.c b/drivers/media/platform/soc_camera/atmel-isi.c
index f0b6c900034d..38c723aca438 100644
--- a/drivers/media/platform/soc_camera/atmel-isi.c
+++ b/drivers/media/platform/soc_camera/atmel-isi.c
@@ -406,7 +406,7 @@ static int start_streaming(struct vb2_queue *vq, unsigned int count)
 }
 
 /* abort streaming and wait for last buffer */
-static int stop_streaming(struct vb2_queue *vq)
+static void stop_streaming(struct vb2_queue *vq)
 {
 	struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
 	struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
@@ -433,7 +433,7 @@ static int stop_streaming(struct vb2_queue *vq)
 	if (time_after(jiffies, timeout)) {
 		dev_err(icd->parent,
 			"Timeout waiting for finishing codec request\n");
-		return -ETIMEDOUT;
+		return;
 	}
 
 	/* Disable interrupts */
@@ -444,8 +444,6 @@ static int stop_streaming(struct vb2_queue *vq)
 	ret = atmel_isi_wait_status(isi, WAIT_ISI_DISABLE);
 	if (ret < 0)
 		dev_err(icd->parent, "Disable ISI timed out\n");
-
-	return ret;
 }
 
 static struct vb2_ops isi_video_qops = {
diff --git a/drivers/media/platform/soc_camera/mx2_camera.c b/drivers/media/platform/soc_camera/mx2_camera.c
index 3e844803bdca..b40bc2e5ba47 100644
--- a/drivers/media/platform/soc_camera/mx2_camera.c
+++ b/drivers/media/platform/soc_camera/mx2_camera.c
@@ -741,7 +741,7 @@ static int mx2_start_streaming(struct vb2_queue *q, unsigned int count)
 	return 0;
 }
 
-static int mx2_stop_streaming(struct vb2_queue *q)
+static void mx2_stop_streaming(struct vb2_queue *q)
 {
 	struct soc_camera_device *icd = soc_camera_from_vb2q(q);
 	struct soc_camera_host *ici =
@@ -773,8 +773,6 @@ static int mx2_stop_streaming(struct vb2_queue *q)
 
 	dma_free_coherent(ici->v4l2_dev.dev,
 			  pcdev->discard_size, b, pcdev->discard_buffer_dma);
-
-	return 0;
 }
 
 static struct vb2_ops mx2_videobuf_ops = {
diff --git a/drivers/media/platform/soc_camera/mx3_camera.c b/drivers/media/platform/soc_camera/mx3_camera.c
index 9ed81ac6881c..83315dfeef62 100644
--- a/drivers/media/platform/soc_camera/mx3_camera.c
+++ b/drivers/media/platform/soc_camera/mx3_camera.c
@@ -406,7 +406,7 @@ static int mx3_videobuf_init(struct vb2_buffer *vb)
 	return 0;
 }
 
-static int mx3_stop_streaming(struct vb2_queue *q)
+static void mx3_stop_streaming(struct vb2_queue *q)
 {
 	struct soc_camera_device *icd = soc_camera_from_vb2q(q);
 	struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
@@ -430,8 +430,6 @@ static int mx3_stop_streaming(struct vb2_queue *q)
 	}
 
 	spin_unlock_irqrestore(&mx3_cam->lock, flags);
-
-	return 0;
 }
 
 static struct vb2_ops mx3_videobuf_ops = {
diff --git a/drivers/media/platform/soc_camera/rcar_vin.c b/drivers/media/platform/soc_camera/rcar_vin.c
index 704eee766487..e594230e84d3 100644
--- a/drivers/media/platform/soc_camera/rcar_vin.c
+++ b/drivers/media/platform/soc_camera/rcar_vin.c
@@ -513,7 +513,7 @@ static int rcar_vin_videobuf_init(struct vb2_buffer *vb)
 	return 0;
 }
 
-static int rcar_vin_stop_streaming(struct vb2_queue *vq)
+static void rcar_vin_stop_streaming(struct vb2_queue *vq)
 {
 	struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
 	struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
@@ -524,8 +524,6 @@ static int rcar_vin_stop_streaming(struct vb2_queue *vq)
 	list_for_each_safe(buf_head, tmp, &priv->capture)
 		list_del_init(buf_head);
 	spin_unlock_irq(&priv->lock);
-
-	return 0;
 }
 
 static struct vb2_ops rcar_vin_vb2_ops = {
diff --git a/drivers/media/platform/soc_camera/sh_mobile_ceu_camera.c b/drivers/media/platform/soc_camera/sh_mobile_ceu_camera.c
index 3e75a469cd49..20ad4a571d37 100644
--- a/drivers/media/platform/soc_camera/sh_mobile_ceu_camera.c
+++ b/drivers/media/platform/soc_camera/sh_mobile_ceu_camera.c
@@ -471,7 +471,7 @@ static int sh_mobile_ceu_videobuf_init(struct vb2_buffer *vb)
 	return 0;
 }
 
-static int sh_mobile_ceu_stop_streaming(struct vb2_queue *q)
+static void sh_mobile_ceu_stop_streaming(struct vb2_queue *q)
 {
 	struct soc_camera_device *icd = container_of(q, struct soc_camera_device, vb2_vidq);
 	struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
@@ -487,7 +487,7 @@ static int sh_mobile_ceu_stop_streaming(struct vb2_queue *q)
 
 	spin_unlock_irq(&pcdev->lock);
 
-	return sh_mobile_ceu_soft_reset(pcdev);
+	sh_mobile_ceu_soft_reset(pcdev);
 }
 
 static struct vb2_ops sh_mobile_ceu_videobuf_ops = {