[PATCH 0/3] ALSA: es1938: Fine-tuning for seven function implementations

[PATCH 0/3] ALSA: es1938: Fine-tuning for seven function implementations

[SF Markus Elfring]

From: Markus Elfring <elfring@users.sourceforge.net>
Date: Tue, 14 Nov 2017 21:30:12 +0100

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

Markus Elfring (3):
  Adjust 14 function calls together with a variable assignment
  Use common error handling code in snd_es1938_probe()
  Use common error handling code in snd_es1938_create()

 sound/pci/es1938.c | 117 ++++++++++++++++++++++++++++++-----------------------
 1 file changed, 67 insertions(+), 50 deletions(-)

-- 
2.15.0

[PATCH 1/3] ALSA: es1938: Adjust 14 function calls together with a variable assignment

[SF Markus Elfring]

From: Markus Elfring <elfring@users.sourceforge.net>
Date: Tue, 14 Nov 2017 21:00:32 +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/es1938.c | 54 +++++++++++++++++++++++++++++++++++-------------------
 1 file changed, 35 insertions(+), 19 deletions(-)

diff --git a/sound/pci/es1938.c b/sound/pci/es1938.c
index 9d248eb2e26c..83d652bdef51 100644
--- a/sound/pci/es1938.c
+++ b/sound/pci/es1938.c
@@ -312,7 +312,8 @@ static void snd_es1938_write_cmd(struct es1938 *chip, unsigned char cmd)
 	int i;
 	unsigned char v;
 	for (i = 0; i < WRITE_LOOP_TIMEOUT; i++) {
-		if (!(v = inb(SLSB_REG(chip, READSTATUS)) & 0x80)) {
+		v = inb(SLSB_REG(chip, READSTATUS));
+		if (!(v & 0x80)) {
 			outb(cmd, SLSB_REG(chip, WRITEDATA));
 			return;
 		}
@@ -328,9 +329,13 @@ static int snd_es1938_get_byte(struct es1938 *chip)
 {
 	int i;
 	unsigned char v;
-	for (i = GET_LOOP_TIMEOUT; i; i--)
-		if ((v = inb(SLSB_REG(chip, STATUS))) & 0x80)
+
+	for (i = GET_LOOP_TIMEOUT; i; i--) {
+		v = inb(SLSB_REG(chip, STATUS));
+		if (v & 0x80)
 			return inb(SLSB_REG(chip, READDATA));
+	}
+
 	dev_err(chip->card->dev, "get_byte timeout: status 0x02%x\n", v);
 	return -ENODEV;
 }
@@ -885,11 +890,10 @@ static int snd_es1938_pcm_hw_params(struct snd_pcm_substream *substream,
 				    struct snd_pcm_hw_params *hw_params)
 
 {
-	int err;
+	int err = snd_pcm_lib_malloc_pages(substream,
+					   params_buffer_bytes(hw_params));
 
-	if ((err = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params))) < 0)
-		return err;
-	return 0;
+	return (err < 0) ? err : 0;
 }
 
 static int snd_es1938_pcm_hw_free(struct snd_pcm_substream *substream)
@@ -1035,9 +1039,9 @@ static const struct snd_pcm_ops snd_es1938_capture_ops = {
 static int snd_es1938_new_pcm(struct es1938 *chip, int device)
 {
 	struct snd_pcm *pcm;
-	int err;
+	int err = snd_pcm_new(chip->card, "es-1938-1946", device, 2, 1, &pcm);
 
-	if ((err = snd_pcm_new(chip->card, "es-1938-1946", device, 2, 1, &pcm)) < 0)
+	if (err < 0)
 		return err;
 	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_es1938_playback_ops);
 	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_es1938_capture_ops);
@@ -1594,7 +1598,8 @@ static int snd_es1938_create(struct snd_card *card,
 	*rchip = NULL;
 
 	/* enable PCI device */
-	if ((err = pci_enable_device(pci)) < 0)
+	err = pci_enable_device(pci);
+	if (err < 0)
 		return err;
         /* check, if we can restrict PCI DMA transfers to 24 bits */
 	if (dma_set_mask(&pci->dev, DMA_BIT_MASK(24)) < 0 ||
@@ -1615,7 +1620,8 @@ static int snd_es1938_create(struct snd_card *card,
 	chip->card = card;
 	chip->pci = pci;
 	chip->irq = -1;
-	if ((err = pci_request_regions(pci, "ESS Solo-1")) < 0) {
+	err = pci_request_regions(pci, "ESS Solo-1");
+	if (err < 0) {
 		kfree(chip);
 		pci_disable_device(pci);
 		return err;
@@ -1640,7 +1646,8 @@ static int snd_es1938_create(struct snd_card *card,
 
 	snd_es1938_chip_init(chip);
 
-	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_es1938_free(chip);
 		return err;
 	}
@@ -1771,7 +1778,9 @@ static int snd_es1938_mixer(struct es1938 *chip)
 				kctl->private_free = snd_es1938_hwv_free;
 				break;
 			}
-		if ((err = snd_ctl_add(card, kctl)) < 0)
+
+		err = snd_ctl_add(card, kctl);
+		if (err < 0)
 			return err;
 	}
 	return 0;
@@ -1805,7 +1814,9 @@ static int snd_es1938_probe(struct pci_dev *pci,
 		    	return -ENODEV;
 		}
 	}
-	if ((err = snd_es1938_create(card, pci, &chip)) < 0) {
+
+	err = snd_es1938_create(card, pci, &chip);
+	if (err < 0) {
 		snd_card_free(card);
 		return err;
 	}
@@ -1818,11 +1829,13 @@ static int snd_es1938_probe(struct pci_dev *pci,
 		chip->revision,
 		chip->irq);
 
-	if ((err = snd_es1938_new_pcm(chip, 0)) < 0) {
+	err = snd_es1938_new_pcm(chip, 0);
+	if (err < 0) {
 		snd_card_free(card);
 		return err;
 	}
-	if ((err = snd_es1938_mixer(chip)) < 0) {
+	err = snd_es1938_mixer(chip);
+	if (err < 0) {
 		snd_card_free(card);
 		return err;
 	}
@@ -1833,11 +1846,13 @@ static int snd_es1938_probe(struct pci_dev *pci,
 		dev_err(card->dev, "OPL3 not detected at 0x%lx\n",
 			   SLSB_REG(chip, FMLOWADDR));
 	} else {
-	        if ((err = snd_opl3_timer_new(opl3, 0, 1)) < 0) {
+		err = snd_opl3_timer_new(opl3, 0, 1);
+		if (err < 0) {
 	                snd_card_free(card);
 	                return err;
 		}
-	        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;
 		}
@@ -1855,7 +1870,8 @@ static int snd_es1938_probe(struct pci_dev *pci,
 
 	snd_es1938_create_gameport(chip);
 
-	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: es1938: Use common error handling code in snd_es1938_probe()

[SF Markus Elfring]

From: Markus Elfring <elfring@users.sourceforge.net>
Date: Tue, 14 Nov 2017 21:06:05 +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/es1938.c | 48 ++++++++++++++++++++++--------------------------
 1 file changed, 22 insertions(+), 26 deletions(-)

diff --git a/sound/pci/es1938.c b/sound/pci/es1938.c
index 83d652bdef51..b19e611345d1 100644
--- a/sound/pci/es1938.c
+++ b/sound/pci/es1938.c
@@ -1810,16 +1810,15 @@ static int snd_es1938_probe(struct pci_dev *pci,
 	for (idx = 0; idx < 5; idx++) {
 		if (pci_resource_start(pci, idx) == 0 ||
 		    !(pci_resource_flags(pci, idx) & IORESOURCE_IO)) {
-		    	snd_card_free(card);
-		    	return -ENODEV;
+			err = -ENODEV;
+			goto free_card;
 		}
 	}
 
 	err = snd_es1938_create(card, pci, &chip);
-	if (err < 0) {
-		snd_card_free(card);
-		return err;
-	}
+	if (err < 0)
+		goto free_card;
+
 	card->private_data = chip;
 
 	strcpy(card->driver, "ES1938");
@@ -1830,15 +1829,13 @@ static int snd_es1938_probe(struct pci_dev *pci,
 		chip->irq);
 
 	err = snd_es1938_new_pcm(chip, 0);
-	if (err < 0) {
-		snd_card_free(card);
-		return err;
-	}
+	if (err < 0)
+		goto free_card;
+
 	err = snd_es1938_mixer(chip);
-	if (err < 0) {
-		snd_card_free(card);
-		return err;
-	}
+	if (err < 0)
+		goto free_card;
+
 	if (snd_opl3_create(card,
 			    SLSB_REG(chip, FMLOWADDR),
 			    SLSB_REG(chip, FMHIGHADDR),
@@ -1847,15 +1844,12 @@ static int snd_es1938_probe(struct pci_dev *pci,
 			   SLSB_REG(chip, FMLOWADDR));
 	} else {
 		err = snd_opl3_timer_new(opl3, 0, 1);
-		if (err < 0) {
-	                snd_card_free(card);
-	                return err;
-		}
+		if (err < 0)
+			goto free_card;
+
 		err = snd_opl3_hwdep_new(opl3, 0, 1, NULL);
-		if (err < 0) {
-	                snd_card_free(card);
-	                return err;
-		}
+		if (err < 0)
+			goto free_card;
 	}
 	if (snd_mpu401_uart_new(card, 0, MPU401_HW_MPU401,
 				chip->mpu_port,
@@ -1871,14 +1865,16 @@ static int snd_es1938_probe(struct pci_dev *pci,
 	snd_es1938_create_gameport(chip);
 
 	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_es1938_remove(struct pci_dev *pci)
-- 
2.15.0

[PATCH 3/3] ALSA: es1938: Use common error handling code in snd_es1938_create()

[SF Markus Elfring]

From: Markus Elfring <elfring@users.sourceforge.net>
Date: Tue, 14 Nov 2017 21:25:55 +0100

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

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
---
 sound/pci/es1938.c | 29 +++++++++++++++++------------
 1 file changed, 17 insertions(+), 12 deletions(-)

diff --git a/sound/pci/es1938.c b/sound/pci/es1938.c
index b19e611345d1..2b4dd1297bbc 100644
--- a/sound/pci/es1938.c
+++ b/sound/pci/es1938.c
@@ -1606,14 +1606,14 @@ static int snd_es1938_create(struct snd_card *card,
 	    dma_set_coherent_mask(&pci->dev, DMA_BIT_MASK(24)) < 0) {
 		dev_err(card->dev,
 			"architecture does not support 24bit PCI busmaster DMA\n");
-		pci_disable_device(pci);
-                return -ENXIO;
+		err = -ENXIO;
+		goto disable_device;
         }
 
 	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);
 	spin_lock_init(&chip->mixer_lock);
@@ -1623,8 +1623,7 @@ static int snd_es1938_create(struct snd_card *card,
 	err = pci_request_regions(pci, "ESS Solo-1");
 	if (err < 0) {
 		kfree(chip);
-		pci_disable_device(pci);
-		return err;
+		goto disable_device;
 	}
 	chip->io_port = pci_resource_start(pci, 0);
 	chip->sb_port = pci_resource_start(pci, 1);
@@ -1634,8 +1633,8 @@ static int snd_es1938_create(struct snd_card *card,
 	if (request_irq(pci->irq, snd_es1938_interrupt, IRQF_SHARED,
 			KBUILD_MODNAME, chip)) {
 		dev_err(card->dev, "unable to grab IRQ %d\n", pci->irq);
-		snd_es1938_free(chip);
-		return -EBUSY;
+		err = -EBUSY;
+		goto free_sound_chip;
 	}
 	chip->irq = pci->irq;
 	dev_dbg(card->dev,
@@ -1647,13 +1646,19 @@ static int snd_es1938_create(struct snd_card *card,
 	snd_es1938_chip_init(chip);
 
 	err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
-	if (err < 0) {
-		snd_es1938_free(chip);
-		return err;
-	}
+	if (err < 0)
+		goto free_sound_chip;
 
 	*rchip = chip;
 	return 0;
+
+disable_device:
+	pci_disable_device(pci);
+	return err;
+
+free_sound_chip:
+	snd_es1938_free(chip);
+	return err;
 }
 
 /* --------------------------------------------------------------------
-- 
2.15.0