linux-kernel - [PATCH 30/30] sound/soc: Use kmemdup rather than duplicating its implementation

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Message-Id: <20190703131842.26082-1-huangfq.daxian@gmail.com>
Date:   Wed,  3 Jul 2019 21:18:42 +0800
From:   Fuqian Huang <huangfq.daxian@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Jie Yang <yang.jie@...ux.intel.com>,
        patches@...nsource.cirrus.com, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org,
        Fuqian Huang <huangfq.daxian@...il.com>
Subject: [PATCH 30/30] sound/soc: Use kmemdup rather than duplicating its implementation

kmemdup is introduced to duplicate a region of memory in a neat way.
Rather than kmalloc/kzalloc + memset, 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 + memset.

Signed-off-by: Fuqian Huang <huangfq.daxian@...il.com>
---
 sound/soc/codecs/wm0010.c             | 4 +---
 sound/soc/intel/atom/sst/sst_loader.c | 3 +--
 2 files changed, 2 insertions(+), 5 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;
diff --git a/sound/soc/intel/atom/sst/sst_loader.c b/sound/soc/intel/atom/sst/sst_loader.c
index ce11c36848c4..cc95af35c060 100644
--- a/sound/soc/intel/atom/sst/sst_loader.c
+++ b/sound/soc/intel/atom/sst/sst_loader.c
@@ -288,14 +288,13 @@ static int sst_cache_and_parse_fw(struct intel_sst_drv *sst,
 {
 	int retval = 0;
 
-	sst->fw_in_mem = kzalloc(fw->size, GFP_KERNEL);
+	sst->fw_in_mem = kmemdup(fw->data, fw->size, GFP_KERNEL);
 	if (!sst->fw_in_mem) {
 		retval = -ENOMEM;
 		goto end_release;
 	}
 	dev_dbg(sst->dev, "copied fw to %p", sst->fw_in_mem);
 	dev_dbg(sst->dev, "phys: %lx", (unsigned long)virt_to_phys(sst->fw_in_mem));
-	memcpy(sst->fw_in_mem, fw->data, fw->size);
 	retval = sst_parse_fw_memcpy(sst, fw->size, &sst->memcpy_list);
 	if (retval) {
 		dev_err(sst->dev, "Failed to parse fw\n");
-- 
2.11.0