[alsa-devel] [PATCH] ASoC: wm8958: use <asm/unaligned.h> to simplify code

[Ben Dooks (Codethink)]

Simplify the memcpy/be32_to_cpu() code by simply using
get_unaligned_be32() throughout and makes the code nicer
to look at.

This fixes the following warnings from sparse:

sound/soc/codecs/wm8958-dsp2.c:62:26: warning: cast to restricted __be32
sound/soc/codecs/wm8958-dsp2.c:62:26: warning: cast to restricted __be32
sound/soc/codecs/wm8958-dsp2.c:62:26: warning: cast to restricted __be32
sound/soc/codecs/wm8958-dsp2.c:62:26: warning: cast to restricted __be32
sound/soc/codecs/wm8958-dsp2.c:62:26: warning: cast to restricted __be32
sound/soc/codecs/wm8958-dsp2.c:62:26: warning: cast to restricted __be32
sound/soc/codecs/wm8958-dsp2.c:69:15: warning: cast to restricted __be32
sound/soc/codecs/wm8958-dsp2.c:69:15: warning: cast to restricted __be32
sound/soc/codecs/wm8958-dsp2.c:69:15: warning: cast to restricted __be32
sound/soc/codecs/wm8958-dsp2.c:69:15: warning: cast to restricted __be32
sound/soc/codecs/wm8958-dsp2.c:69:15: warning: cast to restricted __be32
sound/soc/codecs/wm8958-dsp2.c:69:15: warning: cast to restricted __be32
sound/soc/codecs/wm8958-dsp2.c:72:18: warning: cast to restricted __be32
sound/soc/codecs/wm8958-dsp2.c:72:18: warning: cast to restricted __be32
sound/soc/codecs/wm8958-dsp2.c:72:18: warning: cast to restricted __be32
sound/soc/codecs/wm8958-dsp2.c:72:18: warning: cast to restricted __be32
sound/soc/codecs/wm8958-dsp2.c:72:18: warning: cast to restricted __be32
sound/soc/codecs/wm8958-dsp2.c:72:18: warning: cast to restricted __be32
sound/soc/codecs/wm8958-dsp2.c:91:17: warning: cast to restricted __be64
sound/soc/codecs/wm8958-dsp2.c:91:17: warning: cast to restricted __be64
sound/soc/codecs/wm8958-dsp2.c:91:17: warning: cast to restricted __be64
sound/soc/codecs/wm8958-dsp2.c:91:17: warning: cast to restricted __be64
sound/soc/codecs/wm8958-dsp2.c:91:17: warning: cast to restricted __be64
sound/soc/codecs/wm8958-dsp2.c:91:17: warning: cast to restricted __be64
sound/soc/codecs/wm8958-dsp2.c:91:17: warning: cast to restricted __be64
sound/soc/codecs/wm8958-dsp2.c:91:17: warning: cast to restricted __be64
sound/soc/codecs/wm8958-dsp2.c:91:17: warning: cast to restricted __be64
sound/soc/codecs/wm8958-dsp2.c:91:17: warning: cast to restricted __be64
sound/soc/codecs/wm8958-dsp2.c:108:29: warning: cast to restricted __be32
sound/soc/codecs/wm8958-dsp2.c:108:29: warning: cast to restricted __be32
sound/soc/codecs/wm8958-dsp2.c:108:29: warning: cast to restricted __be32
sound/soc/codecs/wm8958-dsp2.c:108:29: warning: cast to restricted __be32
sound/soc/codecs/wm8958-dsp2.c:108:29: warning: cast to restricted __be32
sound/soc/codecs/wm8958-dsp2.c:108:29: warning: cast to restricted __be32
sound/soc/codecs/wm8958-dsp2.c:120:26: warning: cast to restricted __be32
sound/soc/codecs/wm8958-dsp2.c:120:26: warning: cast to restricted __be32
sound/soc/codecs/wm8958-dsp2.c:120:26: warning: cast to restricted __be32
sound/soc/codecs/wm8958-dsp2.c:120:26: warning: cast to restricted __be32
sound/soc/codecs/wm8958-dsp2.c:120:26: warning: cast to restricted __be32
sound/soc/codecs/wm8958-dsp2.c:120:26: warning: cast to restricted __be32

Signed-off-by: Ben Dooks <ben.dooks at codethink.co.uk>
---
Cc: Liam Girdwood <lgirdwood at gmail.com>
Cc: Mark Brown <broonie at kernel.org>
Cc: Jaroslav Kysela <perex at perex.cz>
Cc: Takashi Iwai <tiwai at suse.com>
Cc: patches at opensource.cirrus.com
Cc: alsa-devel at alsa-project.org
---
 sound/soc/codecs/wm8958-dsp2.c | 22 +++++++++-------------
 1 file changed, 9 insertions(+), 13 deletions(-)

diff --git a/sound/soc/codecs/wm8958-dsp2.c b/sound/soc/codecs/wm8958-dsp2.c
index 18535b326680..ca42445b649d 100644
--- a/sound/soc/codecs/wm8958-dsp2.c
+++ b/sound/soc/codecs/wm8958-dsp2.c
@@ -25,6 +25,8 @@
 #include <linux/mfd/wm8994/pdata.h>
 #include <linux/mfd/wm8994/gpio.h>
 
+#include <asm/unaligned.h>
+
 #include "wm8994.h"
 
 #define WM_FW_BLOCK_INFO 0xff
@@ -58,18 +60,15 @@ static int wm8958_dsp2_fw(struct snd_soc_component *component, const char *name,
 	}
 
 	if (memcmp(fw->data, "WMFW", 4) != 0) {
-		memcpy(&data32, fw->data, sizeof(data32));
-		data32 = be32_to_cpu(data32);
+		data32 = get_unaligned_be32(fw->data);
 		dev_err(component->dev, "%s: firmware has bad file magic %08x\n",
 			name, data32);
 		goto err;
 	}
 
-	memcpy(&data32, fw->data + 4, sizeof(data32));
-	len = be32_to_cpu(data32);
+	len = get_unaligned_be32(fw->data + 4);
+	data32 = get_unaligned_be32(fw->data + 8);
 
-	memcpy(&data32, fw->data + 8, sizeof(data32));
-	data32 = be32_to_cpu(data32);
 	if ((data32 >> 24) & 0xff) {
 		dev_err(component->dev, "%s: unsupported firmware version %d\n",
 			name, (data32 >> 24) & 0xff);
@@ -87,9 +86,8 @@ static int wm8958_dsp2_fw(struct snd_soc_component *component, const char *name,
 	}
 
 	if (check) {
-		memcpy(&data64, fw->data + 24, sizeof(u64));
-		dev_info(component->dev, "%s timestamp %llx\n",
-			 name, be64_to_cpu(data64));
+		data64 = get_unaligned_be64(fw->data + 24);
+		dev_info(component->dev, "%s timestamp %llx\n",  name, data64);
 	} else {
 		snd_soc_component_write(component, 0x102, 0x2);
 		snd_soc_component_write(component, 0x900, 0x2);
@@ -104,8 +102,7 @@ static int wm8958_dsp2_fw(struct snd_soc_component *component, const char *name,
 			goto err;
 		}
 
-		memcpy(&data32, data + 4, sizeof(data32));
-		block_len = be32_to_cpu(data32);
+		block_len = get_unaligned_be32(data + 4);
 		if (block_len + 8 > len) {
 			dev_err(component->dev, "%zd byte block longer than file\n",
 				block_len);
@@ -116,8 +113,7 @@ static int wm8958_dsp2_fw(struct snd_soc_component *component, const char *name,
 			goto err;
 		}
 
-		memcpy(&data32, data, sizeof(data32));
-		data32 = be32_to_cpu(data32);
+		data32 = get_unaligned_be32(data);
 
 		switch ((data32 >> 24) & 0xff) {
 		case WM_FW_BLOCK_INFO:
-- 
2.23.0