[PATCH 0/3] ALSA: cs4281: Fine-tuning for five function implementations

[PATCH 0/3] ALSA: cs4281: Fine-tuning for five function implementations

[SF Markus Elfring]

From: Markus Elfring <elfring@users.sourceforge.net>
Date: Mon, 13 Nov 2017 13:46:23 +0100

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

Markus Elfring (3):
  Adjust 18 function calls together with a variable assignment
  Use common error handling code in snd_cs4281_probe()
  Use common error handling code in snd_cs4281_create()

 sound/pci/cs4281.c | 136 ++++++++++++++++++++++++++++++-----------------------
 1 file changed, 77 insertions(+), 59 deletions(-)

-- 
2.15.0

[PATCH 1/3] ALSA: cs4281: Adjust 18 function calls together with a variable assignment

[SF Markus Elfring]

From: Markus Elfring <elfring@users.sourceforge.net>
Date: Mon, 13 Nov 2017 12:52:53 +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/cs4281.c | 59 ++++++++++++++++++++++++++++++++++++------------------
 1 file changed, 40 insertions(+), 19 deletions(-)

diff --git a/sound/pci/cs4281.c b/sound/pci/cs4281.c
index ec4247638fa1..cf0bcab2a36b 100644
--- a/sound/pci/cs4281.c
+++ b/sound/pci/cs4281.c
@@ -1102,23 +1102,31 @@ static int snd_cs4281_mixer(struct cs4281 *chip)
 		.read = snd_cs4281_ac97_read,
 	};
 
-	if ((err = snd_ac97_bus(card, 0, &ops, chip, &chip->ac97_bus)) < 0)
+	err = snd_ac97_bus(card, 0, &ops, chip, &chip->ac97_bus);
+	if (err < 0)
 		return err;
 	chip->ac97_bus->private_free = snd_cs4281_mixer_free_ac97_bus;
 
 	memset(&ac97, 0, sizeof(ac97));
 	ac97.private_data = chip;
 	ac97.private_free = snd_cs4281_mixer_free_ac97;
-	if ((err = snd_ac97_mixer(chip->ac97_bus, &ac97, &chip->ac97)) < 0)
+	err = snd_ac97_mixer(chip->ac97_bus, &ac97, &chip->ac97);
+	if (err < 0)
 		return err;
 	if (chip->dual_codec) {
 		ac97.num = 1;
-		if ((err = snd_ac97_mixer(chip->ac97_bus, &ac97, &chip->ac97_secondary)) < 0)
+		err = snd_ac97_mixer(chip->ac97_bus, &ac97,
+				     &chip->ac97_secondary);
+		if (err < 0)
 			return err;
 	}
-	if ((err = snd_ctl_add(card, snd_ctl_new1(&snd_cs4281_fm_vol, chip))) < 0)
+
+	err = snd_ctl_add(card, snd_ctl_new1(&snd_cs4281_fm_vol, chip));
+	if (err < 0)
 		return err;
-	if ((err = snd_ctl_add(card, snd_ctl_new1(&snd_cs4281_pcm_vol, chip))) < 0)
+
+	err = snd_ctl_add(card, snd_ctl_new1(&snd_cs4281_pcm_vol, chip));
+	if (err < 0)
 		return err;
 	return 0;
 }
@@ -1346,7 +1354,8 @@ static int snd_cs4281_create(struct snd_card *card,
 	};
 
 	*rchip = NULL;
-	if ((err = pci_enable_device(pci)) < 0)
+	err = pci_enable_device(pci);
+	if (err < 0)
 		return err;
 	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
 	if (chip == NULL) {
@@ -1364,7 +1373,8 @@ static int snd_cs4281_create(struct snd_card *card,
 	}
 	chip->dual_codec = dual_codec;
 
-	if ((err = pci_request_regions(pci, "CS4281")) < 0) {
+	err = pci_request_regions(pci, "CS4281");
+	if (err < 0) {
 		kfree(chip);
 		pci_disable_device(pci);
 		return err;
@@ -1393,7 +1403,8 @@ static int snd_cs4281_create(struct snd_card *card,
 		return tmp;
 	}
 
-	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_cs4281_free(chip);
 		return err;
 	}
@@ -1432,12 +1443,15 @@ static int snd_cs4281_chip_init(struct cs4281 *chip)
          * space between 0e4h and 0ffh to be written. */	
 	snd_cs4281_pokeBA0(chip, BA0_CWPR, 0x4281);
 	
-	if ((tmp = snd_cs4281_peekBA0(chip, BA0_SERC1)) != (BA0_SERC1_SO1EN | BA0_SERC1_AC97)) {
+	tmp = snd_cs4281_peekBA0(chip, BA0_SERC1);
+	if (tmp != (BA0_SERC1_SO1EN | BA0_SERC1_AC97)) {
 		dev_err(chip->card->dev,
 			"SERC1 AC'97 check failed (0x%x)\n", tmp);
 		return -EIO;
 	}
-	if ((tmp = snd_cs4281_peekBA0(chip, BA0_SERC2)) != (BA0_SERC2_SI1EN | BA0_SERC2_AC97)) {
+
+	tmp = snd_cs4281_peekBA0(chip, BA0_SERC2);
+	if (tmp != (BA0_SERC2_SI1EN | BA0_SERC2_AC97)) {
 		dev_err(chip->card->dev,
 			"SERC2 AC'97 check failed (0x%x)\n", tmp);
 		return -EIO;
@@ -1784,9 +1798,9 @@ static const struct snd_rawmidi_ops snd_cs4281_midi_input =
 static int snd_cs4281_midi(struct cs4281 *chip, int device)
 {
 	struct snd_rawmidi *rmidi;
-	int err;
+	int err = snd_rawmidi_new(chip->card, "CS4281", device, 1, 1, &rmidi);
 
-	if ((err = snd_rawmidi_new(chip->card, "CS4281", device, 1, 1, &rmidi)) < 0)
+	if (err < 0)
 		return err;
 	strcpy(rmidi->name, "CS4281");
 	snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &snd_cs4281_midi_output);
@@ -1919,32 +1933,38 @@ static int snd_cs4281_probe(struct pci_dev *pci,
 	if (err < 0)
 		return err;
 
-	if ((err = snd_cs4281_create(card, pci, &chip, dual_codec[dev])) < 0) {
+	err = snd_cs4281_create(card, pci, &chip, dual_codec[dev]);
+	if (err < 0) {
 		snd_card_free(card);
 		return err;
 	}
 	card->private_data = chip;
 
-	if ((err = snd_cs4281_mixer(chip)) < 0) {
+	err = snd_cs4281_mixer(chip);
+	if (err < 0) {
 		snd_card_free(card);
 		return err;
 	}
-	if ((err = snd_cs4281_pcm(chip, 0)) < 0) {
+	err = snd_cs4281_pcm(chip, 0);
+	if (err < 0) {
 		snd_card_free(card);
 		return err;
 	}
-	if ((err = snd_cs4281_midi(chip, 0)) < 0) {
+	err = snd_cs4281_midi(chip, 0);
+	if (err < 0) {
 		snd_card_free(card);
 		return err;
 	}
-	if ((err = snd_opl3_new(card, OPL3_HW_OPL3_CS4281, &opl3)) < 0) {
+	err = snd_opl3_new(card, OPL3_HW_OPL3_CS4281, &opl3);
+	if (err < 0) {
 		snd_card_free(card);
 		return err;
 	}
 	opl3->private_data = chip;
 	opl3->command = snd_cs4281_opl3_command;
 	snd_opl3_init(opl3);
-	if ((err = snd_opl3_hwdep_new(opl3, 0, 1, NULL)) < 0) {
+	err = snd_opl3_hwdep_new(opl3, 0, 1, NULL);
+	if (err < 0) {
 		snd_card_free(card);
 		return err;
 	}
@@ -1956,7 +1976,8 @@ static int snd_cs4281_probe(struct pci_dev *pci,
 		chip->ba0_addr,
 		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 2/3] ALSA: cs4281: Use common error handling code in snd_cs4281_probe()

[SF Markus Elfring]

From: Markus Elfring <elfring@users.sourceforge.net>
Date: Mon, 13 Nov 2017 13:10:11 +0100

Add a jump target so that a bit of exception handling can be better reused
at the end of this function.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
---
 sound/pci/cs4281.c | 52 ++++++++++++++++++++++++----------------------------
 1 file changed, 24 insertions(+), 28 deletions(-)

diff --git a/sound/pci/cs4281.c b/sound/pci/cs4281.c
index cf0bcab2a36b..ed6b97dbd1cc 100644
--- a/sound/pci/cs4281.c
+++ b/sound/pci/cs4281.c
@@ -1934,40 +1934,34 @@ static int snd_cs4281_probe(struct pci_dev *pci,
 		return err;
 
 	err = snd_cs4281_create(card, pci, &chip, dual_codec[dev]);
-	if (err < 0) {
-		snd_card_free(card);
-		return err;
-	}
+	if (err < 0)
+		goto free_card;
+
 	card->private_data = chip;
 
 	err = snd_cs4281_mixer(chip);
-	if (err < 0) {
-		snd_card_free(card);
-		return err;
-	}
+	if (err < 0)
+		goto free_card;
+
 	err = snd_cs4281_pcm(chip, 0);
-	if (err < 0) {
-		snd_card_free(card);
-		return err;
-	}
+	if (err < 0)
+		goto free_card;
+
 	err = snd_cs4281_midi(chip, 0);
-	if (err < 0) {
-		snd_card_free(card);
-		return err;
-	}
+	if (err < 0)
+		goto free_card;
+
 	err = snd_opl3_new(card, OPL3_HW_OPL3_CS4281, &opl3);
-	if (err < 0) {
-		snd_card_free(card);
-		return err;
-	}
+	if (err < 0)
+		goto free_card;
+
 	opl3->private_data = chip;
 	opl3->command = snd_cs4281_opl3_command;
 	snd_opl3_init(opl3);
 	err = snd_opl3_hwdep_new(opl3, 0, 1, NULL);
-	if (err < 0) {
-		snd_card_free(card);
-		return err;
-	}
+	if (err < 0)
+		goto free_card;
+
 	snd_cs4281_create_gameport(chip);
 	strcpy(card->driver, "CS4281");
 	strcpy(card->shortname, "Cirrus Logic CS4281");
@@ -1977,14 +1971,16 @@ static int snd_cs4281_probe(struct pci_dev *pci,
 		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);
 	dev++;
 	return 0;
+
+free_card:
+	snd_card_free(card);
+	return err;
 }
 
 static void snd_cs4281_remove(struct pci_dev *pci)
-- 
2.15.0

[PATCH 3/3] ALSA: cs4281: Use common error handling code in snd_cs4281_create()

[SF Markus Elfring]

From: Markus Elfring <elfring@users.sourceforge.net>
Date: Mon, 13 Nov 2017 13:34:57 +0100

* Add jump targets so that a bit of exception handling can be better reused
  at the end of this function.

* Delete the local variable "tmp" which was unnecessary
  because the variable "err" could be used at this place again.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
---
 sound/pci/cs4281.c | 41 +++++++++++++++++++++--------------------
 1 file changed, 21 insertions(+), 20 deletions(-)

diff --git a/sound/pci/cs4281.c b/sound/pci/cs4281.c
index ed6b97dbd1cc..6cd7300a0182 100644
--- a/sound/pci/cs4281.c
+++ b/sound/pci/cs4281.c
@@ -1347,7 +1347,6 @@ static int snd_cs4281_create(struct snd_card *card,
 			     int dual_codec)
 {
 	struct cs4281 *chip;
-	unsigned int tmp;
 	int err;
 	static struct snd_device_ops ops = {
 		.dev_free =	snd_cs4281_dev_free,
@@ -1359,8 +1358,8 @@ static int snd_cs4281_create(struct snd_card *card,
 		return err;
 	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->card = card;
@@ -1376,43 +1375,45 @@ static int snd_cs4281_create(struct snd_card *card,
 	err = pci_request_regions(pci, "CS4281");
 	if (err < 0) {
 		kfree(chip);
-		pci_disable_device(pci);
-		return err;
+		goto disable_device;
 	}
 	chip->ba0_addr = pci_resource_start(pci, 0);
 	chip->ba1_addr = pci_resource_start(pci, 1);
 
 	chip->ba0 = pci_ioremap_bar(pci, 0);
 	chip->ba1 = pci_ioremap_bar(pci, 1);
-	if (!chip->ba0 || !chip->ba1) {
-		snd_cs4281_free(chip);
-		return -ENOMEM;
-	}
+	if (!chip->ba0 || !chip->ba1)
+		goto e_nomem;
 	
 	if (request_irq(pci->irq, snd_cs4281_interrupt, IRQF_SHARED,
 			KBUILD_MODNAME, chip)) {
 		dev_err(card->dev, "unable to grab IRQ %d\n", pci->irq);
-		snd_cs4281_free(chip);
-		return -ENOMEM;
+		goto e_nomem;
 	}
 	chip->irq = pci->irq;
 
-	tmp = snd_cs4281_chip_init(chip);
-	if (tmp) {
-		snd_cs4281_free(chip);
-		return tmp;
-	}
+	err = snd_cs4281_chip_init(chip);
+	if (err)
+		goto free_sound_chip;
 
 	err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
-	if (err < 0) {
-		snd_cs4281_free(chip);
-		return err;
-	}
+	if (err < 0)
+		goto free_sound_chip;
 
 	snd_cs4281_proc_init(chip);
 
 	*rchip = chip;
 	return 0;
+
+disable_device:
+	pci_disable_device(pci);
+	return err;
+
+e_nomem:
+	err = -ENOMEM;
+free_sound_chip:
+	snd_cs4281_free(chip);
+	return err;
 }
 
 static int snd_cs4281_chip_init(struct cs4281 *chip)
-- 
2.15.0