[PATCH v2 2/2] media: v4l2-ctrl: Move compound control initialization

[Ezequiel Garcia <ezequiel@collabora.com>]

Rework std_init adding an explicit initialization for
compound controls.

While here, make sure the control is initialized to zero,
before providing default values for all its fields.

Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
--
Changes from v1:
* Drop the s/break/return replacements
* Drop unneeded default cases
* Fix memset to take account of the index

 drivers/media/v4l2-core/v4l2-ctrls.c | 37 +++++++++++++++++-----------
 1 file changed, 23 insertions(+), 14 deletions(-)

diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
index c7d5fdb8efb4..ebaff951ec87 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -1506,17 +1506,38 @@ static bool std_equal(const struct v4l2_ctrl *ctrl, u32 idx,
 	}
 }
 
-static void std_init(const struct v4l2_ctrl *ctrl, u32 idx,
+static void std_init_compound(const struct v4l2_ctrl *ctrl, u32 idx,
 		     union v4l2_ctrl_ptr ptr)
 {
 	struct v4l2_ctrl_mpeg2_slice_params *p_mpeg2_slice_params;
 
+	idx *= ctrl->elem_size;
+	memset(ptr.p + idx, 0, ctrl->elem_size);
+
 	/*
 	 * The cast is needed to get rid of a gcc warning complaining that
 	 * V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS is not part of the
 	 * v4l2_ctrl_type enum.
 	 */
 	switch ((u32)ctrl->type) {
+	case V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS:
+		p_mpeg2_slice_params = ptr.p;
+		/* 4:2:0 */
+		p_mpeg2_slice_params->sequence.chroma_format = 1;
+		/* 8 bits */
+		p_mpeg2_slice_params->picture.intra_dc_precision = 0;
+		/* interlaced top field */
+		p_mpeg2_slice_params->picture.picture_structure = 1;
+		p_mpeg2_slice_params->picture.picture_coding_type =
+					V4L2_MPEG2_PICTURE_CODING_TYPE_I;
+		break;
+	}
+}
+
+static void std_init(const struct v4l2_ctrl *ctrl, u32 idx,
+		     union v4l2_ctrl_ptr ptr)
+{
+	switch (ctrl->type) {
 	case V4L2_CTRL_TYPE_STRING:
 		idx *= ctrl->elem_size;
 		memset(ptr.p_char + idx, ' ', ctrl->minimum);
@@ -1543,20 +1564,8 @@ static void std_init(const struct v4l2_ctrl *ctrl, u32 idx,
 	case V4L2_CTRL_TYPE_U32:
 		ptr.p_u32[idx] = ctrl->default_value;
 		break;
-	case V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS:
-		p_mpeg2_slice_params = ptr.p;
-		/* 4:2:0 */
-		p_mpeg2_slice_params->sequence.chroma_format = 1;
-		/* 8 bits */
-		p_mpeg2_slice_params->picture.intra_dc_precision = 0;
-		/* interlaced top field */
-		p_mpeg2_slice_params->picture.picture_structure = 1;
-		p_mpeg2_slice_params->picture.picture_coding_type =
-					V4L2_MPEG2_PICTURE_CODING_TYPE_I;
-		break;
 	default:
-		idx *= ctrl->elem_size;
-		memset(ptr.p + idx, 0, ctrl->elem_size);
+		std_init_compound(ctrl, idx, ptr);
 		break;
 	}
 }
-- 
2.20.1