linux-kernel - [PATCH] media: v4l2-dev.c: Modified the macro SET_VALID

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Date:   Tue, 25 May 2021 17:41:48 +0800
From:   lijian_8010a29@....com
To:     mchehab@...nel.org, hverkuil-cisco@...all.nl,
        sakari.ailus@...ux.intel.com, ezequiel@...labora.com,
        laurent.pinchart@...asonboard.com
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        lijian <lijian@...ong.com>
Subject: [PATCH] media: v4l2-dev.c: Modified the macro SET_VALID_IOCTL

From: lijian <lijian@...ong.com>

Macros starting with if should be enclosed by a do - while loop
to avoid possible if/else logic defects.
So modified the macro SET_VALID_IOCTL with do - while loop.

Signed-off-by: lijian <lijian@...ong.com>
---
 drivers/media/v4l2-core/v4l2-dev.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/media/v4l2-core/v4l2-dev.c b/drivers/media/v4l2-core/v4l2-dev.c
index 7d0edf3530be..15067843456e 100644
--- a/drivers/media/v4l2-core/v4l2-dev.c
+++ b/drivers/media/v4l2-core/v4l2-dev.c
@@ -520,9 +520,8 @@ static int get_index(struct video_device *vdev)
 	return find_first_zero_bit(used, VIDEO_NUM_DEVICES);
 }
 
-#define SET_VALID_IOCTL(ops, cmd, op)			\
-	if (ops->op)					\
-		set_bit(_IOC_NR(cmd), valid_ioctls)
+#define SET_VALID_IOCTL(ops, cmd, op) \
+	do { if (ops->op) set_bit(_IOC_NR(cmd), valid_ioctls); } while (0)
 
 /* This determines which ioctls are actually implemented in the driver.
    It's a one-time thing which simplifies video_ioctl2 as it can just do
-- 
2.25.1