media: stm32: dcmi: Fix subdev op call with uninitialized state

stm32-dcmi calls its source subdev with v4l2_subdev_call() using a
v4l2_subdev_state constructed on stack. This means that init_cfg is
never called for that state, and a source subdev that depends on the
init_cfg call may break.

A new macro has been added for this particular purpose, which properly
initializes the state, so let's use v4l2_subdev_call_state_try() here.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Tested-by: Marek Vasut <marex@denx.de>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/platform/st/stm32/stm32-dcmi.c

@@ -998,10 +998,6 @@ static int dcmi_try_fmt(struct stm32_dcmi *dcmi, struct v4l2_format *f,
 	const struct dcmi_format *sd_fmt;
 	struct dcmi_framesize sd_fsize;
 	struct v4l2_pix_format *pix = &f->fmt.pix;
-	struct v4l2_subdev_pad_config pad_cfg;
-	struct v4l2_subdev_state pad_state = {
-		.pads = &pad_cfg
-		};
 	struct v4l2_subdev_format format = {
 		.which = V4L2_SUBDEV_FORMAT_TRY,
 	};
@@ -1036,8 +1032,7 @@ static int dcmi_try_fmt(struct stm32_dcmi *dcmi, struct v4l2_format *f,
 	}
 
 	v4l2_fill_mbus_format(&format.format, pix, sd_fmt->mbus_code);
-	ret = v4l2_subdev_call(dcmi->source, pad, set_fmt,
-			       &pad_state, &format);
+	ret = v4l2_subdev_call_state_try(dcmi->source, pad, set_fmt, &format);
 	if (ret < 0)
 		return ret;
 
@@ -1186,10 +1181,6 @@ static int dcmi_set_sensor_format(struct stm32_dcmi *dcmi,
 	struct v4l2_subdev_format format = {
 		.which = V4L2_SUBDEV_FORMAT_TRY,
 	};
-	struct v4l2_subdev_pad_config pad_cfg;
-	struct v4l2_subdev_state pad_state = {
-		.pads = &pad_cfg
-		};
 	int ret;
 
 	sd_fmt = find_format_by_fourcc(dcmi, pix->pixelformat);
@@ -1202,8 +1193,7 @@ static int dcmi_set_sensor_format(struct stm32_dcmi *dcmi,
 	}
 
 	v4l2_fill_mbus_format(&format.format, pix, sd_fmt->mbus_code);
-	ret = v4l2_subdev_call(dcmi->source, pad, set_fmt,
-			       &pad_state, &format);
+	ret = v4l2_subdev_call_state_try(dcmi->source, pad, set_fmt, &format);
 	if (ret < 0)
 		return ret;