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[PATCH] ASoC: samsung: Remove tests of member address

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  [PATCH] ASoC: samsung: Remove tests of member address Krzysztof Kozlowski <krzk@kernel.org> - 2016-12-10 11:00 +0100
    Re: [PATCH] ASoC: samsung: Remove tests of member address Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> - 2016-12-12 14:40 +0100
    Applied "ASoC: samsung: Remove tests of member address" to the asoc tree Mark Brown <broonie@kernel.org> - 2016-12-15 13:30 +0100

#1539804 — [PATCH] ASoC: samsung: Remove tests of member address

The driver was checking for non-NULL address of struct's members:
 - s3c_audio_pdata->type (union),
 - s3c_audio_pdata->type.i2s (embedded struct).

This is pointless as these will be always non-NULL.  The 's3c_audio_pdata'
is always initialized in static memory so it will be zeroed.
Additionally the 'type' member was an union with only one member.

It is safe to reorganize the structures to get rid of useless union and
checks for addresses to fix the coccinelle warning:
	>> sound/soc/samsung/i2s.c:1270:2-4: ERROR: test of a variable/field address

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>

---

Not tested on the hardware.
---
 arch/arm/mach-s3c64xx/dev-audio.c      |  4 +---
 include/linux/platform_data/asoc-s3c.h |  6 ++----
 sound/soc/samsung/i2s.c                | 10 ++--------
 3 files changed, 5 insertions(+), 15 deletions(-)

diff --git a/arch/arm/mach-s3c64xx/dev-audio.c b/arch/arm/mach-s3c64xx/dev-audio.c
index b57783371d52..247dcc0b691e 100644
--- a/arch/arm/mach-s3c64xx/dev-audio.c
+++ b/arch/arm/mach-s3c64xx/dev-audio.c
@@ -106,9 +106,7 @@ static struct s3c_audio_pdata i2sv4_pdata = {
 	.dma_playback = DMACH_HSI_I2SV40_TX,
 	.dma_capture = DMACH_HSI_I2SV40_RX,
 	.type = {
-		.i2s = {
-			.quirks = QUIRK_PRI_6CHAN,
-		},
+		.quirks = QUIRK_PRI_6CHAN,
 	},
 };
 
diff --git a/include/linux/platform_data/asoc-s3c.h b/include/linux/platform_data/asoc-s3c.h
index 15bf56ee8af7..90641a5daaf0 100644
--- a/include/linux/platform_data/asoc-s3c.h
+++ b/include/linux/platform_data/asoc-s3c.h
@@ -18,7 +18,7 @@
 
 extern void s3c64xx_ac97_setup_gpio(int);
 
-struct samsung_i2s {
+struct samsung_i2s_type {
 /* If the Primary DAI has 5.1 Channels */
 #define QUIRK_PRI_6CHAN		(1 << 0)
 /* If the I2S block has a Stereo Overlay Channel */
@@ -47,7 +47,5 @@ struct s3c_audio_pdata {
 	void *dma_capture;
 	void *dma_play_sec;
 	void *dma_capture_mic;
-	union {
-		struct samsung_i2s i2s;
-	} type;
+	struct samsung_i2s_type type;
 };
diff --git a/sound/soc/samsung/i2s.c b/sound/soc/samsung/i2s.c
index e00974bc5616..d55326289a4a 100644
--- a/sound/soc/samsung/i2s.c
+++ b/sound/soc/samsung/i2s.c
@@ -1218,7 +1218,6 @@ static int samsung_i2s_probe(struct platform_device *pdev)
 {
 	struct i2s_dai *pri_dai, *sec_dai = NULL;
 	struct s3c_audio_pdata *i2s_pdata = pdev->dev.platform_data;
-	struct samsung_i2s *i2s_cfg = NULL;
 	struct resource *res;
 	u32 regs_base, quirks = 0, idma_addr = 0;
 	struct device_node *np = pdev->dev.of_node;
@@ -1267,13 +1266,8 @@ static int samsung_i2s_probe(struct platform_device *pdev)
 		pri_dai->dma_capture.filter_data = i2s_pdata->dma_capture;
 		pri_dai->filter = i2s_pdata->dma_filter;
 
-		if (&i2s_pdata->type)
-			i2s_cfg = &i2s_pdata->type.i2s;
-
-		if (i2s_cfg) {
-			quirks = i2s_cfg->quirks;
-			idma_addr = i2s_cfg->idma_addr;
-		}
+		quirks = i2s_pdata->type.quirks;
+		idma_addr = i2s_pdata->type.idma_addr;
 	} else {
 		quirks = i2s_dai_data->quirks;
 		if (of_property_read_u32(np, "samsung,idma-addr",
-- 
2.7.4

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#1540326

Hi,

On Saturday, December 10, 2016 11:51:11 AM Krzysztof Kozlowski wrote:
> The driver was checking for non-NULL address of struct's members:
>  - s3c_audio_pdata->type (union),
>  - s3c_audio_pdata->type.i2s (embedded struct).
> 
> This is pointless as these will be always non-NULL.  The 's3c_audio_pdata'
> is always initialized in static memory so it will be zeroed.
> Additionally the 'type' member was an union with only one member.
> 
> It is safe to reorganize the structures to get rid of useless union and
> checks for addresses to fix the coccinelle warning:
> 	>> sound/soc/samsung/i2s.c:1270:2-4: ERROR: test of a variable/field address
> 
> Reported-by: kbuild test robot <fengguang.wu@intel.com>
> Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>

Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics

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#1542704 — Applied "ASoC: samsung: Remove tests of member address" to the asoc tree

The patch

   ASoC: samsung: Remove tests of member address

has been applied to the asoc tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

From 409c69be433b819c924a8d1c457a835bc6d51700 Mon Sep 17 00:00:00 2001
From: Krzysztof Kozlowski <krzk@kernel.org>
Date: Sat, 10 Dec 2016 11:51:11 +0200
Subject: [PATCH] ASoC: samsung: Remove tests of member address

The driver was checking for non-NULL address of struct's members:
 - s3c_audio_pdata->type (union),
 - s3c_audio_pdata->type.i2s (embedded struct).

This is pointless as these will be always non-NULL.  The 's3c_audio_pdata'
is always initialized in static memory so it will be zeroed.
Additionally the 'type' member was an union with only one member.

It is safe to reorganize the structures to get rid of useless union and
checks for addresses to fix the coccinelle warning:
	>> sound/soc/samsung/i2s.c:1270:2-4: ERROR: test of a variable/field address

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 arch/arm/mach-s3c64xx/dev-audio.c      |  4 +---
 include/linux/platform_data/asoc-s3c.h |  6 ++----
 sound/soc/samsung/i2s.c                | 10 ++--------
 3 files changed, 5 insertions(+), 15 deletions(-)

diff --git a/arch/arm/mach-s3c64xx/dev-audio.c b/arch/arm/mach-s3c64xx/dev-audio.c
index b57783371d52..247dcc0b691e 100644
--- a/arch/arm/mach-s3c64xx/dev-audio.c
+++ b/arch/arm/mach-s3c64xx/dev-audio.c
@@ -106,9 +106,7 @@ static struct s3c_audio_pdata i2sv4_pdata = {
 	.dma_playback = DMACH_HSI_I2SV40_TX,
 	.dma_capture = DMACH_HSI_I2SV40_RX,
 	.type = {
-		.i2s = {
-			.quirks = QUIRK_PRI_6CHAN,
-		},
+		.quirks = QUIRK_PRI_6CHAN,
 	},
 };
 
diff --git a/include/linux/platform_data/asoc-s3c.h b/include/linux/platform_data/asoc-s3c.h
index 15bf56ee8af7..90641a5daaf0 100644
--- a/include/linux/platform_data/asoc-s3c.h
+++ b/include/linux/platform_data/asoc-s3c.h
@@ -18,7 +18,7 @@
 
 extern void s3c64xx_ac97_setup_gpio(int);
 
-struct samsung_i2s {
+struct samsung_i2s_type {
 /* If the Primary DAI has 5.1 Channels */
 #define QUIRK_PRI_6CHAN		(1 << 0)
 /* If the I2S block has a Stereo Overlay Channel */
@@ -47,7 +47,5 @@ struct s3c_audio_pdata {
 	void *dma_capture;
 	void *dma_play_sec;
 	void *dma_capture_mic;
-	union {
-		struct samsung_i2s i2s;
-	} type;
+	struct samsung_i2s_type type;
 };
diff --git a/sound/soc/samsung/i2s.c b/sound/soc/samsung/i2s.c
index e00974bc5616..d55326289a4a 100644
--- a/sound/soc/samsung/i2s.c
+++ b/sound/soc/samsung/i2s.c
@@ -1218,7 +1218,6 @@ static int samsung_i2s_probe(struct platform_device *pdev)
 {
 	struct i2s_dai *pri_dai, *sec_dai = NULL;
 	struct s3c_audio_pdata *i2s_pdata = pdev->dev.platform_data;
-	struct samsung_i2s *i2s_cfg = NULL;
 	struct resource *res;
 	u32 regs_base, quirks = 0, idma_addr = 0;
 	struct device_node *np = pdev->dev.of_node;
@@ -1267,13 +1266,8 @@ static int samsung_i2s_probe(struct platform_device *pdev)
 		pri_dai->dma_capture.filter_data = i2s_pdata->dma_capture;
 		pri_dai->filter = i2s_pdata->dma_filter;
 
-		if (&i2s_pdata->type)
-			i2s_cfg = &i2s_pdata->type.i2s;
-
-		if (i2s_cfg) {
-			quirks = i2s_cfg->quirks;
-			idma_addr = i2s_cfg->idma_addr;
-		}
+		quirks = i2s_pdata->type.quirks;
+		idma_addr = i2s_pdata->type.idma_addr;
 	} else {
 		quirks = i2s_dai_data->quirks;
 		if (of_property_read_u32(np, "samsung,idma-addr",
-- 
2.11.0

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