[PATCH] media: sunxi: sun6i_mipi_csi2.c/sun8i_a83t_mipi_csi2.c: clarify error handling

[Hans Verkuil <hverkuil-cisco@xxxxxxxxx>]

Both sun6i_mipi_csi2.c and sun8i_a83t_mipi_csi2.c have the same issue:
the comment before the ret = 0 assignment is incorrect, drop it and
always assign the result of the v4l2_subdev_call(..., 0) to ret.

In the disable label check for !on and set ret to 0 in that case.

This fixes two smatch warnings:

drivers/media/platform/sunxi/sun6i-mipi-csi2/sun6i_mipi_csi2.c:193 sun6i_mipi_csi2_s_stream() warn: missing error code 'ret'
drivers/media/platform/sunxi/sun8i-a83t-mipi-csi2/sun8i_a83t_mipi_csi2.c:225 sun8i_a83t_mipi_csi2_s_stream() warn: missing error code 'ret'

Signed-off-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
---
 .../media/platform/sunxi/sun6i-mipi-csi2/sun6i_mipi_csi2.c | 7 ++++---
 .../sunxi/sun8i-a83t-mipi-csi2/sun8i_a83t_mipi_csi2.c      | 7 ++++---
 2 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/media/platform/sunxi/sun6i-mipi-csi2/sun6i_mipi_csi2.c b/drivers/media/platform/sunxi/sun6i-mipi-csi2/sun6i_mipi_csi2.c
index 31e12f1506cb..a4e3f9a6b2ff 100644
--- a/drivers/media/platform/sunxi/sun6i-mipi-csi2/sun6i_mipi_csi2.c
+++ b/drivers/media/platform/sunxi/sun6i-mipi-csi2/sun6i_mipi_csi2.c
@@ -182,14 +182,13 @@ static int sun6i_mipi_csi2_s_stream(struct v4l2_subdev *subdev, int on)
 	unsigned int lanes_count =
 		csi2_dev->bridge.endpoint.bus.mipi_csi2.num_data_lanes;
 	unsigned long pixel_rate;
-	/* Initialize to 0 to use both in disable label (ret != 0) and off. */
-	int ret = 0;
+	int ret;
 
 	if (!source_subdev)
 		return -ENODEV;
 
 	if (!on) {
-		v4l2_subdev_call(source_subdev, video, s_stream, 0);
+		ret = v4l2_subdev_call(source_subdev, video, s_stream, 0);
 		goto disable;
 	}
 
@@ -281,6 +280,8 @@ static int sun6i_mipi_csi2_s_stream(struct v4l2_subdev *subdev, int on)
 	return 0;
 
 disable:
+	if (!on)
+		ret = 0;
 	phy_power_off(dphy);
 	sun6i_mipi_csi2_disable(csi2_dev);
 
diff --git a/drivers/media/platform/sunxi/sun8i-a83t-mipi-csi2/sun8i_a83t_mipi_csi2.c b/drivers/media/platform/sunxi/sun8i-a83t-mipi-csi2/sun8i_a83t_mipi_csi2.c
index c82ede3ca0ff..d052ee77ef0a 100644
--- a/drivers/media/platform/sunxi/sun8i-a83t-mipi-csi2/sun8i_a83t_mipi_csi2.c
+++ b/drivers/media/platform/sunxi/sun8i-a83t-mipi-csi2/sun8i_a83t_mipi_csi2.c
@@ -214,14 +214,13 @@ static int sun8i_a83t_mipi_csi2_s_stream(struct v4l2_subdev *subdev, int on)
 	unsigned int lanes_count =
 		csi2_dev->bridge.endpoint.bus.mipi_csi2.num_data_lanes;
 	unsigned long pixel_rate;
-	/* Initialize to 0 to use both in disable label (ret != 0) and off. */
-	int ret = 0;
+	int ret;
 
 	if (!source_subdev)
 		return -ENODEV;
 
 	if (!on) {
-		v4l2_subdev_call(source_subdev, video, s_stream, 0);
+		ret = v4l2_subdev_call(source_subdev, video, s_stream, 0);
 		goto disable;
 	}
 
@@ -313,6 +312,8 @@ static int sun8i_a83t_mipi_csi2_s_stream(struct v4l2_subdev *subdev, int on)
 	return 0;
 
 disable:
+	if (!on)
+		ret = 0;
 	phy_power_off(dphy);
 	sun8i_a83t_mipi_csi2_disable(csi2_dev);
 
-- 
2.35.1