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

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Message-Id: <1450534993-8382-1-git-send-email-hofrat@osadl.org>
Date:	Sat, 19 Dec 2015 15:23:13 +0100
From:	Nicholas Mc Guire <hofrat@...dl.org>
To:	Jaroslav Kysela <perex@...ex.cz>
Cc:	Takashi Iwai <tiwai@...e.com>, Jie Yang <yang.jie@...el.com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
	Nicholas Mc Guire <hofrat@...dl.org>
Subject: [PATCH V2] ALSA: oss: consolidate kmalloc/memset 0 call to kzalloc

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>
---

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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