[PATCH 0/2] ALSA: intel8x0m: Fine-tuning for five function implementations

[PATCH 0/2] ALSA: intel8x0m: Fine-tuning for five function implementations

[SF Markus Elfring]

From: Markus Elfring <elfring@users.sourceforge.net>
Date: Wed, 15 Nov 2017 22:00:11 +0100

Two update suggestions were taken into account
from static source code analysis.

Markus Elfring (2):
  Adjust 12 function calls together with a variable assignment
  Use common error handling code in two functions

 sound/pci/intel8x0m.c | 100 ++++++++++++++++++++++++++++----------------------
 1 file changed, 57 insertions(+), 43 deletions(-)

-- 
2.15.0

[PATCH 1/2] ALSA: intel8x0m: Adjust 12 function calls together with a variable assignment

[SF Markus Elfring]

From: Markus Elfring <elfring@users.sourceforge.net>
Date: Wed, 15 Nov 2017 21:34:23 +0100

The script "checkpatch.pl" pointed information out like the following.

ERROR: do not use assignment in if condition

Thus fix the affected source code places.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
---
 sound/pci/intel8x0m.c | 36 ++++++++++++++++++++++++------------
 1 file changed, 24 insertions(+), 12 deletions(-)

diff --git a/sound/pci/intel8x0m.c b/sound/pci/intel8x0m.c
index 3a4769a97d29..ab798533a6bc 100644
--- a/sound/pci/intel8x0m.c
+++ b/sound/pci/intel8x0m.c
@@ -372,7 +372,8 @@ static unsigned short snd_intel8x0m_codec_read(struct snd_ac97 *ac97,
 		res = 0xffff;
 	} else {
 		res = iagetword(chip, reg + ac97->num * 0x80);
-		if ((tmp = igetdword(chip, ICHREG(GLOB_STA))) & ICH_RCS) {
+		tmp = igetdword(chip, ICHREG(GLOB_STA));
+		if (tmp & ICH_RCS) {
 			/* reset RCS and preserve other R/WC bits */
 			iputdword(chip, ICHREG(GLOB_STA),
 				  tmp & ~(ICH_SRI|ICH_PRI|ICH_TRI|ICH_GSCI));
@@ -847,7 +848,8 @@ static int snd_intel8x0m_mixer(struct intel8x0m *chip, int ac97_clock)
 
 	glob_sta = igetdword(chip, ICHREG(GLOB_STA));
 
-	if ((err = snd_ac97_bus(chip->card, 0, &ops, chip, &pbus)) < 0)
+	err = snd_ac97_bus(chip->card, 0, &ops, chip, &pbus);
+	if (err < 0)
 		goto __err;
 	pbus->private_free = snd_intel8x0m_mixer_free_ac97_bus;
 	if (ac97_clock >= 8000 && ac97_clock <= 48000)
@@ -856,7 +858,8 @@ static int snd_intel8x0m_mixer(struct intel8x0m *chip, int ac97_clock)
 
 	ac97.pci = chip->pci;
 	ac97.num = glob_sta & ICH_SCR ? 1 : 0;
-	if ((err = snd_ac97_mixer(pbus, &ac97, &x97)) < 0) {
+	err = snd_ac97_mixer(pbus, &ac97, &x97);
+	if (err < 0) {
 		dev_err(chip->card->dev,
 			"Unable to initialize codec #%d\n", ac97.num);
 		if (ac97.num == 0)
@@ -974,7 +977,8 @@ static int snd_intel8x0m_chip_init(struct intel8x0m *chip, int probing)
 	unsigned int i;
 	int err;
 	
-	if ((err = snd_intel8x0m_ich_chip_init(chip, probing)) < 0)
+	err = snd_intel8x0m_ich_chip_init(chip, probing);
+	if (err < 0)
 		return err;
 	iagetword(chip, 0);	/* clear semaphore flag */
 
@@ -1125,7 +1129,8 @@ static int snd_intel8x0m_create(struct snd_card *card,
 
 	*r_intel8x0m = NULL;
 
-	if ((err = pci_enable_device(pci)) < 0)
+	err = pci_enable_device(pci);
+	if (err < 0)
 		return err;
 
 	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
@@ -1139,7 +1144,8 @@ static int snd_intel8x0m_create(struct snd_card *card,
 	chip->pci = pci;
 	chip->irq = -1;
 
-	if ((err = pci_request_regions(pci, card->shortname)) < 0) {
+	err = pci_request_regions(pci, card->shortname);
+	if (err < 0) {
 		kfree(chip);
 		pci_disable_device(pci);
 		return err;
@@ -1224,12 +1230,14 @@ static int snd_intel8x0m_create(struct snd_card *card,
 	chip->int_sta_reg = ICH_REG_GLOB_STA;
 	chip->int_sta_mask = int_sta_masks;
 
-	if ((err = snd_intel8x0m_chip_init(chip, 1)) < 0) {
+	err = snd_intel8x0m_chip_init(chip, 1);
+	if (err < 0) {
 		snd_intel8x0m_free(chip);
 		return err;
 	}
 
-	if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
+	err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
+	if (err < 0) {
 		snd_intel8x0m_free(chip);
 		return err;
 	}
@@ -1286,17 +1294,20 @@ static int snd_intel8x0m_probe(struct pci_dev *pci,
 	}
 	strcat(card->shortname," Modem");
 
-	if ((err = snd_intel8x0m_create(card, pci, pci_id->driver_data, &chip)) < 0) {
+	err = snd_intel8x0m_create(card, pci, pci_id->driver_data, &chip);
+	if (err < 0) {
 		snd_card_free(card);
 		return err;
 	}
 	card->private_data = chip;
 
-	if ((err = snd_intel8x0m_mixer(chip, ac97_clock)) < 0) {
+	err = snd_intel8x0m_mixer(chip, ac97_clock);
+	if (err < 0) {
 		snd_card_free(card);
 		return err;
 	}
-	if ((err = snd_intel8x0m_pcm(chip)) < 0) {
+	err = snd_intel8x0m_pcm(chip);
+	if (err < 0) {
 		snd_card_free(card);
 		return err;
 	}
@@ -1306,7 +1317,8 @@ static int snd_intel8x0m_probe(struct pci_dev *pci,
 	sprintf(card->longname, "%s at irq %i",
 		card->shortname, chip->irq);
 
-	if ((err = snd_card_register(card)) < 0) {
+	err = snd_card_register(card);
+	if (err < 0) {
 		snd_card_free(card);
 		return err;
 	}
-- 
2.15.0

[PATCH 2/2] ALSA: intel8x0m: Use common error handling code in two functions

[SF Markus Elfring]

From: Markus Elfring <elfring@users.sourceforge.net>
Date: Wed, 15 Nov 2017 21:52:00 +0100

Add jump targets so that a bit of exception handling can be better reused
at the end of these functions.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
---
 sound/pci/intel8x0m.c | 76 ++++++++++++++++++++++++++-------------------------
 1 file changed, 39 insertions(+), 37 deletions(-)

diff --git a/sound/pci/intel8x0m.c b/sound/pci/intel8x0m.c
index ab798533a6bc..3ff994996255 100644
--- a/sound/pci/intel8x0m.c
+++ b/sound/pci/intel8x0m.c
@@ -1135,8 +1135,8 @@ static int snd_intel8x0m_create(struct snd_card *card,
 
 	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
 	if (chip == NULL) {
-		pci_disable_device(pci);
-		return -ENOMEM;
+		err = -ENOMEM;
+		goto disable_device;
 	}
 	spin_lock_init(&chip->reg_lock);
 	chip->device_type = device_type;
@@ -1147,8 +1147,7 @@ static int snd_intel8x0m_create(struct snd_card *card,
 	err = pci_request_regions(pci, card->shortname);
 	if (err < 0) {
 		kfree(chip);
-		pci_disable_device(pci);
-		return err;
+		goto disable_device;
 	}
 
 	if (device_type == DEVICE_ALI) {
@@ -1163,8 +1162,7 @@ static int snd_intel8x0m_create(struct snd_card *card,
 		chip->addr = pci_iomap(pci, 0, 0);
 	if (!chip->addr) {
 		dev_err(card->dev, "AC'97 space ioremap problem\n");
-		snd_intel8x0m_free(chip);
-		return -EIO;
+		goto e_io;
 	}
 	if (pci_resource_flags(pci, 3) & IORESOURCE_MEM) /* ICH4 */
 		chip->bmaddr = pci_iomap(pci, 3, 0);
@@ -1172,16 +1170,15 @@ static int snd_intel8x0m_create(struct snd_card *card,
 		chip->bmaddr = pci_iomap(pci, 1, 0);
 	if (!chip->bmaddr) {
 		dev_err(card->dev, "Controller space ioremap problem\n");
-		snd_intel8x0m_free(chip);
-		return -EIO;
+		goto e_io;
 	}
 
  port_inited:
 	if (request_irq(pci->irq, snd_intel8x0m_interrupt, IRQF_SHARED,
 			KBUILD_MODNAME, chip)) {
 		dev_err(card->dev, "unable to grab IRQ %d\n", pci->irq);
-		snd_intel8x0m_free(chip);
-		return -EBUSY;
+		err = -EBUSY;
+		goto free_sound_chip;
 	}
 	chip->irq = pci->irq;
 	pci_set_master(pci);
@@ -1215,8 +1212,8 @@ static int snd_intel8x0m_create(struct snd_card *card,
 	if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, snd_dma_pci_data(pci),
 				chip->bdbars_count * sizeof(u32) * ICH_MAX_FRAGS * 2,
 				&chip->bdbars) < 0) {
-		snd_intel8x0m_free(chip);
-		return -ENOMEM;
+		err = -ENOMEM;
+		goto free_sound_chip;
 	}
 	/* tables must be aligned to 8 bytes here, but the kernel pages
 	   are much bigger, so we don't care (on i386) */
@@ -1231,19 +1228,25 @@ static int snd_intel8x0m_create(struct snd_card *card,
 	chip->int_sta_mask = int_sta_masks;
 
 	err = snd_intel8x0m_chip_init(chip, 1);
-	if (err < 0) {
-		snd_intel8x0m_free(chip);
-		return err;
-	}
+	if (err < 0)
+		goto free_sound_chip;
 
 	err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
-	if (err < 0) {
-		snd_intel8x0m_free(chip);
-		return err;
-	}
+	if (err < 0)
+		goto free_sound_chip;
 
 	*r_intel8x0m = chip;
 	return 0;
+
+disable_device:
+	pci_disable_device(pci);
+	return err;
+
+e_io:
+	err = -EIO;
+free_sound_chip:
+	snd_intel8x0m_free(chip);
+	return err;
 }
 
 static struct shortname_table {
@@ -1295,35 +1298,34 @@ static int snd_intel8x0m_probe(struct pci_dev *pci,
 	strcat(card->shortname," Modem");
 
 	err = snd_intel8x0m_create(card, pci, pci_id->driver_data, &chip);
-	if (err < 0) {
-		snd_card_free(card);
-		return err;
-	}
+	if (err < 0)
+		goto free_card;
+
 	card->private_data = chip;
 
 	err = snd_intel8x0m_mixer(chip, ac97_clock);
-	if (err < 0) {
-		snd_card_free(card);
-		return err;
-	}
+	if (err < 0)
+		goto free_card;
+
 	err = snd_intel8x0m_pcm(chip);
-	if (err < 0) {
-		snd_card_free(card);
-		return err;
-	}
-	
+	if (err < 0)
+		goto free_card;
+
 	snd_intel8x0m_proc_init(chip);
 
 	sprintf(card->longname, "%s at irq %i",
 		card->shortname, chip->irq);
 
 	err = snd_card_register(card);
-	if (err < 0) {
-		snd_card_free(card);
-		return err;
-	}
+	if (err < 0)
+		goto free_card;
+
 	pci_set_drvdata(pci, card);
 	return 0;
+
+free_card:
+	snd_card_free(card);
+	return err;
 }
 
 static void snd_intel8x0m_remove(struct pci_dev *pci)
-- 
2.15.0