[PATCH v2 34/35] sound/soc/codecs: Use kmemdup rather than duplicating its implementation

[PATCH v2 34/35] sound/soc/codecs: Use kmemdup rather than duplicating its implementation

[Fuqian Huang]

kmemdup is introduced to duplicate a region of memory in a neat way.
Rather than kmalloc/kzalloc + memcpy, which the programmer needs to
write the size twice (sometimes lead to mistakes), kmemdup improves
readability, leads to smaller code and also reduce the chances of mistakes.
Suggestion to use kmemdup rather than using kmalloc/kzalloc + memcpy.

Acked-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Signed-off-by: Fuqian Huang <huangfq.daxian@gmail.com>
---
Changes in v2:
  - Fix a typo in commit message (memset -> memcpy)
  - Split into two patches

 sound/soc/codecs/wm0010.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/sound/soc/codecs/wm0010.c b/sound/soc/codecs/wm0010.c
index 727d6703c905..807826f30f58 100644
--- a/sound/soc/codecs/wm0010.c
+++ b/sound/soc/codecs/wm0010.c
@@ -515,7 +515,7 @@ static int wm0010_stage2_load(struct snd_soc_component *component)
 	dev_dbg(component->dev, "Downloading %zu byte stage 2 loader\n", fw->size);
 
 	/* Copy to local buffer first as vmalloc causes problems for dma */
-	img = kzalloc(fw->size, GFP_KERNEL | GFP_DMA);
+	img = kmemdup(&fw->data[0], fw->size, GFP_KERNEL | GFP_DMA);
 	if (!img) {
 		ret = -ENOMEM;
 		goto abort2;
@@ -527,8 +527,6 @@ static int wm0010_stage2_load(struct snd_soc_component *component)
 		goto abort1;
 	}
 
-	memcpy(img, &fw->data[0], fw->size);
-
 	spi_message_init(&m);
 	memset(&t, 0, sizeof(t));
 	t.rx_buf = out;
-- 
2.11.0

Re: [PATCH v2 34/35] sound/soc/codecs: Use kmemdup rather than duplicating its implementation

[Richard Fitzgerald]

Commit message title prefix should be "ASoC: wm0010:" not "sound/soc
/codecs:". Take a look at other patches to the same files.

> kmemdup is introduced to duplicate a region of memory in a neat way.
> Rather than kmalloc/kzalloc + memcpy, which the programmer needs to
> write the size twice (sometimes lead to mistakes), kmemdup improves
> readability, leads to smaller code and also reduce the chances of mistakes.
> Suggestion to use kmemdup rather than using kmalloc/kzalloc + memcpy.
> 
> Acked-by: Richard Fitzgerald <rf@opensource.cirrus.com>
> Signed-off-by: Fuqian Huang <huangfq.daxian@gmail.com>
> ---
> Changes in v2:
>    - Fix a typo in commit message (memset -> memcpy)
>    - Split into two patches
> 
>   sound/soc/codecs/wm0010.c | 4 +---
>   1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/sound/soc/codecs/wm0010.c b/sound/soc/codecs/wm0010.c
> index 727d6703c905..807826f30f58 100644
> --- a/sound/soc/codecs/wm0010.c
> +++ b/sound/soc/codecs/wm0010.c
> @@ -515,7 +515,7 @@ static int wm0010_stage2_load(struct snd_soc_component *component)
>   	dev_dbg(component->dev, "Downloading %zu byte stage 2 loader\n", fw->size);
>   
>   	/* Copy to local buffer first as vmalloc causes problems for dma */
> -	img = kzalloc(fw->size, GFP_KERNEL | GFP_DMA);
> +	img = kmemdup(&fw->data[0], fw->size, GFP_KERNEL | GFP_DMA);
>   	if (!img) {
>   		ret = -ENOMEM;
>   		goto abort2;
> @@ -527,8 +527,6 @@ static int wm0010_stage2_load(struct snd_soc_component *component)
>   		goto abort1;
>   	}
>   
> -	memcpy(img, &fw->data[0], fw->size);
> -
>   	spi_message_init(&m);
>   	memset(&t, 0, sizeof(t));
>   	t.rx_buf = out;
>