linux-kernel - Re: [PATCH V2] ALSA: oss: consolidate kmalloc/memset 0 call to kzalloc

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Date:	Sun, 20 Dec 2015 22:31:24 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	"Nicholas Mc Guire" <hofrat@...dl.org>
Cc:	"Jaroslav Kysela" <perex@...ex.cz>, <alsa-devel@...a-project.org>,
	"Jie Yang" <yang.jie@...el.com>,
	"Lars-Peter Clausen" <lars@...afoo.de>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2] ALSA: oss: consolidate kmalloc/memset 0 call to kzalloc

On Sat, 19 Dec 2015 15:23:13 +0100,
Nicholas Mc Guire wrote:
> 
> This is an API consolidation only. The use of kmalloc + memset to 0
> is equivalent to kzalloc.
> 
> Signed-off-by: Nicholas Mc Guire <hofrat@...dl.org>

Applied, thanks.


Takashi

> ---
> 
> V2: somehow managed to insert exactly the same line being removed
>     so this time actually do the intended kmalloc->kzalloc replacement 
> 
> Found by coccinelle script (relaxed version of
> scripts/coccinelle/api/alloc/kzalloc-simple.cocci)
> 
> Patch was compile tested with: x86_64_defconfig
> CONFIG_SND_PCM_OSS=y
> 
> Patch is against linux-next (localversion-next is -next-20150518)
> 
> diff --git a/sound/core/oss/pcm_oss.c b/sound/core/oss/pcm_oss.c
> index e557dbe..8cdd06f 100644
> --- a/sound/core/oss/pcm_oss.c
> +++ b/sound/core/oss/pcm_oss.c
> @@ -851,7 +851,7 @@ static int snd_pcm_oss_change_params(struct snd_pcm_substream *substream)
>  
>  	if (mutex_lock_interruptible(&runtime->oss.params_lock))
>  		return -EINTR;
> -	sw_params = kmalloc(sizeof(*sw_params), GFP_KERNEL);
> +	sw_params = kzalloc(sizeof(*sw_params), GFP_KERNEL);
>  	params = kmalloc(sizeof(*params), GFP_KERNEL);
>  	sparams = kmalloc(sizeof(*sparams), GFP_KERNEL);
>  	if (!sw_params || !params || !sparams) {
> @@ -989,7 +989,6 @@ static int snd_pcm_oss_change_params(struct snd_pcm_substream *substream)
>  		goto failure;
>  	}
>  
> -	memset(sw_params, 0, sizeof(*sw_params));
>  	if (runtime->oss.trigger) {
>  		sw_params->start_threshold = 1;
>  	} else {
> -- 
> 1.7.10.4
> 
> 
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