linux-kernel - [PATCH v4 2/6] media: v4l2_ctrl: Add const pointer to ctrl

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Message-Id: <20191104130923.22184-2-ribalda@kernel.org>
Date:   Mon,  4 Nov 2019 14:09:19 +0100
From:   Ricardo Ribalda Delgado <ribalda@...nel.org>
To:     Hans Verkuil <hverkuil-cisco@...all.nl>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Ricardo Ribalda Delgado <ribalda@...nel.org>
Subject: [PATCH v4 2/6] media: v4l2_ctrl: Add const pointer to ctrl_ptr

This pointer is used to point to data that is constant. Thanks to this
we can avoid a lot of casting and we make more clear when the data is
constant or variable.

Suggested-by: Hans Verkuil <hverkuil-cisco@...all.nl>
Signed-off-by: Ricardo Ribalda Delgado <ribalda@...nel.org>
---
 include/media/v4l2-ctrls.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
index 78a97b10c89e..7db9e719a583 100644
--- a/include/media/v4l2-ctrls.h
+++ b/include/media/v4l2-ctrls.h
@@ -56,6 +56,7 @@ struct poll_table_struct;
  * @p_hevc_slice_params:	Pointer to an HEVC slice parameters structure.
  * @p_area:			Pointer to an area.
  * @p:				Pointer to a compound value.
+ * @p_const:			Pointer to a constant compound value.
  */
 union v4l2_ctrl_ptr {
 	s32 *p_s32;
@@ -78,6 +79,7 @@ union v4l2_ctrl_ptr {
 	struct v4l2_ctrl_hevc_slice_params *p_hevc_slice_params;
 	struct v4l2_area *p_area;
 	void *p;
+	const void *p_const;
 };
 
 /**
-- 
2.24.0.rc1