* [PATCH v2 -next] video: backlight: use DEFINE_MUTEX() for mutex lock
@ 2020-12-24 13:26 Zheng Yongjun
2021-01-04 10:46 ` Daniel Thompson
0 siblings, 1 reply; 2+ messages in thread
From: Zheng Yongjun @ 2020-12-24 13:26 UTC (permalink / raw)
To: lee.jones, daniel.thompson, jingoohan1, b.zolnierkie, dri-devel,
linux-fbdev, linux-kernel
Cc: Zheng Yongjun
mutex lock can be initialized automatically with DEFINE_MUTEX()
rather than explicitly calling mutex_init().
Signed-off-by: Zheng Yongjun <zhengyongjun3@huawei.com>
---
drivers/video/backlight/backlight.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c
index 537fe1b376ad..d7a09c422547 100644
--- a/drivers/video/backlight/backlight.c
+++ b/drivers/video/backlight/backlight.c
@@ -64,7 +64,7 @@
*/
static struct list_head backlight_dev_list;
-static struct mutex backlight_dev_list_mutex;
+static DEFINE_MUTEX(backlight_dev_list_mutex);
static struct blocking_notifier_head backlight_notifier;
static const char *const backlight_types[] = {
@@ -757,7 +757,6 @@ static int __init backlight_class_init(void)
backlight_class->dev_groups = bl_device_groups;
backlight_class->pm = &backlight_class_dev_pm_ops;
INIT_LIST_HEAD(&backlight_dev_list);
- mutex_init(&backlight_dev_list_mutex);
BLOCKING_INIT_NOTIFIER_HEAD(&backlight_notifier);
return 0;
--
2.22.0
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH v2 -next] video: backlight: use DEFINE_MUTEX() for mutex lock
2020-12-24 13:26 [PATCH v2 -next] video: backlight: use DEFINE_MUTEX() for mutex lock Zheng Yongjun
@ 2021-01-04 10:46 ` Daniel Thompson
0 siblings, 0 replies; 2+ messages in thread
From: Daniel Thompson @ 2021-01-04 10:46 UTC (permalink / raw)
To: Zheng Yongjun
Cc: lee.jones, jingoohan1, b.zolnierkie, dri-devel, linux-fbdev,
linux-kernel
On Thu, Dec 24, 2020 at 09:26:01PM +0800, Zheng Yongjun wrote:
> mutex lock can be initialized automatically with DEFINE_MUTEX()
> rather than explicitly calling mutex_init().
>
> Signed-off-by: Zheng Yongjun <zhengyongjun3@huawei.com>
> ---
> drivers/video/backlight/backlight.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c
> index 537fe1b376ad..d7a09c422547 100644
> --- a/drivers/video/backlight/backlight.c
> +++ b/drivers/video/backlight/backlight.c
> @@ -64,7 +64,7 @@
> */
>
> static struct list_head backlight_dev_list;
> -static struct mutex backlight_dev_list_mutex;
> +static DEFINE_MUTEX(backlight_dev_list_mutex);
> static struct blocking_notifier_head backlight_notifier;
Why do we want to convert one of these variables to use a
static initializers but leave the other two unchanged? Surely they
should all be changed.
Daniel.
>
> static const char *const backlight_types[] = {
> @@ -757,7 +757,6 @@ static int __init backlight_class_init(void)
> backlight_class->dev_groups = bl_device_groups;
> backlight_class->pm = &backlight_class_dev_pm_ops;
> INIT_LIST_HEAD(&backlight_dev_list);
> - mutex_init(&backlight_dev_list_mutex);
> BLOCKING_INIT_NOTIFIER_HEAD(&backlight_notifier);
>
> return 0;
> --
> 2.22.0
>
^ permalink raw reply [flat|nested] 2+ messages in thread
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