[PATCH] counter: replace snprintf in show functions with sysfs_emit

[PATCH] counter: replace snprintf in show functions with sysfs_emit

[Qing Wang]

coccicheck complains about the use of snprintf() in sysfs show functions.

Fix the following coccicheck warning:
drivers/counter/stm32-lptimer-cnt.c:265:8-16: WARNING: use scnprintf or sprintf.
drivers/counter/stm32-lptimer-cnt.c:176:8-16: WARNING: use scnprintf or sprintf.

Use sysfs_emit instead of scnprintf or sprintf makes more sense.

Signed-off-by: Qing Wang <wangqing@vivo.com>
---
 drivers/counter/stm32-lptimer-cnt.c | 2 +-
 drivers/counter/stm32-timer-cnt.c   | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/counter/stm32-lptimer-cnt.c b/drivers/counter/stm32-lptimer-cnt.c
index c19d998..6f1113a 100644
--- a/drivers/counter/stm32-lptimer-cnt.c
+++ b/drivers/counter/stm32-lptimer-cnt.c
@@ -262,7 +262,7 @@ static ssize_t stm32_lptim_cnt_ceiling_read(struct counter_device *counter,
 {
 	struct stm32_lptim_cnt *const priv = counter->priv;
 
-	return snprintf(buf, PAGE_SIZE, "%u\n", priv->ceiling);
+	return sysfs_emit(buf, "%u\n", priv->ceiling);
 }
 
 static ssize_t stm32_lptim_cnt_ceiling_write(struct counter_device *counter,
diff --git a/drivers/counter/stm32-timer-cnt.c b/drivers/counter/stm32-timer-cnt.c
index 603b30a..e772586 100644
--- a/drivers/counter/stm32-timer-cnt.c
+++ b/drivers/counter/stm32-timer-cnt.c
@@ -173,7 +173,7 @@ static ssize_t stm32_count_ceiling_read(struct counter_device *counter,
 
 	regmap_read(priv->regmap, TIM_ARR, &arr);
 
-	return snprintf(buf, PAGE_SIZE, "%u\n", arr);
+	return sysfs_emit(buf, "%u\n", arr);
 }
 
 static ssize_t stm32_count_ceiling_write(struct counter_device *counter,
-- 
2.7.4


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Re: [PATCH] counter: replace snprintf in show functions with sysfs_emit

[William Breathitt Gray]

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On Tue, Oct 12, 2021 at 08:26:59PM -0700, Qing Wang wrote:
> coccicheck complains about the use of snprintf() in sysfs show functions.
> 
> Fix the following coccicheck warning:
> drivers/counter/stm32-lptimer-cnt.c:265:8-16: WARNING: use scnprintf or sprintf.
> drivers/counter/stm32-lptimer-cnt.c:176:8-16: WARNING: use scnprintf or sprintf.
> 
> Use sysfs_emit instead of scnprintf or sprintf makes more sense.
> 
> Signed-off-by: Qing Wang <wangqing@vivo.com>

Hello Qing Wang,

Thank you for your submission. I believe these warnings are already
resolved by commit d70e46af7531 ("counter: Internalize sysfs interface
code") in the linux-next tree. Would you verify whether that is the case
or if we still need to fix this?

Sincerely,

William Breathitt Gray

> ---
>  drivers/counter/stm32-lptimer-cnt.c | 2 +-
>  drivers/counter/stm32-timer-cnt.c   | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/counter/stm32-lptimer-cnt.c b/drivers/counter/stm32-lptimer-cnt.c
> index c19d998..6f1113a 100644
> --- a/drivers/counter/stm32-lptimer-cnt.c
> +++ b/drivers/counter/stm32-lptimer-cnt.c
> @@ -262,7 +262,7 @@ static ssize_t stm32_lptim_cnt_ceiling_read(struct counter_device *counter,
>  {
>  	struct stm32_lptim_cnt *const priv = counter->priv;
>  
> -	return snprintf(buf, PAGE_SIZE, "%u\n", priv->ceiling);
> +	return sysfs_emit(buf, "%u\n", priv->ceiling);
>  }
>  
>  static ssize_t stm32_lptim_cnt_ceiling_write(struct counter_device *counter,
> diff --git a/drivers/counter/stm32-timer-cnt.c b/drivers/counter/stm32-timer-cnt.c
> index 603b30a..e772586 100644
> --- a/drivers/counter/stm32-timer-cnt.c
> +++ b/drivers/counter/stm32-timer-cnt.c
> @@ -173,7 +173,7 @@ static ssize_t stm32_count_ceiling_read(struct counter_device *counter,
>  
>  	regmap_read(priv->regmap, TIM_ARR, &arr);
>  
> -	return snprintf(buf, PAGE_SIZE, "%u\n", arr);
> +	return sysfs_emit(buf, "%u\n", arr);
>  }
>  
>  static ssize_t stm32_count_ceiling_write(struct counter_device *counter,
> -- 
> 2.7.4
> 

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