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

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Date:	Fri, 18 Dec 2015 17:08:49 -0500
From:	"David Rivshin (Allworx)" <drivshin.allworx@...il.com>
To:	Nicholas Mc Guire <hofrat@...dl.org>
Cc:	Jaroslav Kysela <perex@...ex.cz>, alsa-devel@...a-project.org,
	Lars-Peter Clausen <lars@...afoo.de>,
	Takashi Iwai <tiwai@...e.com>, linux-kernel@...r.kernel.org
Subject: Re: [alsa-devel] [PATCH] ALSA: oss: consolidate kmalloc/memset 0
 call to kzalloc

On Fri, 18 Dec 2015 21:01:57 +0100
Nicholas Mc Guire <hofrat@...dl.org> 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>
> ---
> 
> 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
> @@ -850,7 +850,7 @@ 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 = kmalloc(sizeof(*sw_params), GFP_KERNEL);
                     ^
Something odd (manual edit?) seems to have happened to this hunk, 
making it a no-op. I presume that 'm' was supposed to be a 'z'.

>  	params = kmalloc(sizeof(*params), GFP_KERNEL);
>  	sparams = kmalloc(sizeof(*sparams), GFP_KERNEL);
>  	if (!sw_params || !params || !sparams) {
> @@ -988,7 +988,6 @@ 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 {

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