[PATCH 0/3] ALSA: es1968: Fine-tuning for seven function implementations

[PATCH 0/3] ALSA: es1968: Fine-tuning for seven function implementations

[SF Markus Elfring]

From: Markus Elfring <elfring@users.sourceforge.net>
Date: Wed, 15 Nov 2017 10:23:45 +0100

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

Markus Elfring (3):
  Adjust 16 function calls together with a variable assignment
  Use common error handling code in two functions
  Use common error handling code in snd_es1968_capture_open()

 sound/pci/es1968.c | 163 ++++++++++++++++++++++++++++++-----------------------
 1 file changed, 92 insertions(+), 71 deletions(-)

-- 
2.15.0

[PATCH 1/3] ALSA: es1968: Adjust 16 function calls together with a variable assignment

[SF Markus Elfring]

From: Markus Elfring <elfring@users.sourceforge.net>
Date: Tue, 14 Nov 2017 22:45:01 +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/es1968.c | 78 ++++++++++++++++++++++++++++++++----------------------
 1 file changed, 47 insertions(+), 31 deletions(-)

diff --git a/sound/pci/es1968.c b/sound/pci/es1968.c
index 0b1845ca6005..d68980087f93 100644
--- a/sound/pci/es1968.c
+++ b/sound/pci/es1968.c
@@ -1620,7 +1620,8 @@ static int snd_es1968_capture_open(struct snd_pcm_substream *substream)
 	es->mode = ESM_MODE_CAPTURE;
 
 	/* get mixbuffer */
-	if ((es->mixbuf = snd_es1968_new_memory(chip, ESM_MIXBUF_SIZE)) == NULL) {
+	es->mixbuf = snd_es1968_new_memory(chip, ESM_MIXBUF_SIZE);
+	if (!es->mixbuf) {
 		snd_es1968_free_apu_pair(chip, apu1);
 		snd_es1968_free_apu_pair(chip, apu2);
 		kfree(es);
@@ -1717,11 +1718,14 @@ static void es1968_measure_clock(struct es1968 *chip)
 		chip->clock = 48000; /* default clock value */
 
 	/* search 2 APUs (although one apu is enough) */
-	if ((apu = snd_es1968_alloc_apu_pair(chip, ESM_APU_PCM_PLAY)) < 0) {
+	apu = snd_es1968_alloc_apu_pair(chip, ESM_APU_PCM_PLAY);
+	if (apu < 0) {
 		dev_err(chip->card->dev, "Hmm, cannot find empty APU pair!?\n");
 		return;
 	}
-	if ((memory = snd_es1968_new_memory(chip, CLOCK_MEASURE_BUFSIZE)) == NULL) {
+
+	memory = snd_es1968_new_memory(chip, CLOCK_MEASURE_BUFSIZE);
+	if (!memory) {
 		dev_warn(chip->card->dev,
 			 "cannot allocate dma buffer - using default clock %d\n",
 			 chip->clock);
@@ -1813,7 +1817,8 @@ snd_es1968_pcm(struct es1968 *chip, int device)
 	int err;
 
 	/* get DMA buffer */
-	if ((err = snd_es1968_init_dmabuf(chip)) < 0)
+	err = snd_es1968_init_dmabuf(chip);
+	if (err < 0)
 		return err;
 
 	/* set PCMBAR */
@@ -1822,9 +1827,10 @@ snd_es1968_pcm(struct es1968 *chip, int device)
 	wave_set_register(chip, 0x01FE, chip->dma.addr >> 12);
 	wave_set_register(chip, 0x01FF, chip->dma.addr >> 12);
 
-	if ((err = snd_pcm_new(chip->card, "ESS Maestro", device,
-			       chip->playback_streams,
-			       chip->capture_streams, &pcm)) < 0)
+	err = snd_pcm_new(chip->card, "ESS Maestro", device,
+			  chip->playback_streams,
+			  chip->capture_streams, &pcm);
+	if (err < 0)
 		return err;
 
 	pcm->private_data = chip;
@@ -1973,9 +1979,9 @@ static void es1968_update_hw_volume(struct work_struct *work)
 static irqreturn_t snd_es1968_interrupt(int irq, void *dev_id)
 {
 	struct es1968 *chip = dev_id;
-	u32 event;
+	u32 event = inb(chip->io_port + 0x1A);
 
-	if (!(event = inb(chip->io_port + 0x1A)))
+	if (!event)
 		return IRQ_NONE;
 
 	outw(inw(chip->io_port + 4) & 1, chip->io_port + 4);
@@ -2030,13 +2036,15 @@ snd_es1968_mixer(struct es1968 *chip)
 		.read = snd_es1968_ac97_read,
 	};
 
-	if ((err = snd_ac97_bus(chip->card, 0, &ops, NULL, &pbus)) < 0)
+	err = snd_ac97_bus(chip->card, 0, &ops, NULL, &pbus);
+	if (err < 0)
 		return err;
 	pbus->no_vra = 1; /* ES1968 doesn't need VRA */
 
 	memset(&ac97, 0, sizeof(ac97));
 	ac97.private_data = chip;
-	if ((err = snd_ac97_mixer(pbus, &ac97, &chip->ac97)) < 0)
+	err = snd_ac97_mixer(pbus, &ac97, &chip->ac97);
+	if (err < 0)
 		return err;
 
 #ifndef CONFIG_SND_ES1968_INPUT
@@ -2686,7 +2694,8 @@ static int snd_es1968_create(struct snd_card *card,
 	*chip_ret = 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 28 bits */
 	if (dma_set_mask(&pci->dev, DMA_BIT_MASK(28)) < 0 ||
@@ -2718,7 +2727,8 @@ static int snd_es1968_create(struct snd_card *card,
 	chip->playback_streams = play_streams;
 	chip->capture_streams = capt_streams;
 
-	if ((err = pci_request_regions(pci, "ESS Maestro")) < 0) {
+	err = pci_request_regions(pci, "ESS Maestro");
+	if (err < 0) {
 		kfree(chip);
 		pci_disable_device(pci);
 		return err;
@@ -2764,7 +2774,8 @@ static int snd_es1968_create(struct snd_card *card,
 
 	snd_es1968_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_es1968_free(chip);
 		return err;
 	}
@@ -2829,14 +2840,16 @@ static int snd_es1968_probe(struct pci_dev *pci,
 		total_bufsize[dev] = 128;
 	if (total_bufsize[dev] > 4096)
 		total_bufsize[dev] = 4096;
-	if ((err = snd_es1968_create(card, pci,
-				     total_bufsize[dev] * 1024, /* in bytes */
-				     pcm_substreams_p[dev], 
-				     pcm_substreams_c[dev],
-				     pci_id->driver_data,
-				     use_pm[dev],
-				     radio_nr[dev],
-				     &chip)) < 0) {
+
+	err = snd_es1968_create(card, pci,
+				total_bufsize[dev] * 1024, /* in bytes */
+				pcm_substreams_p[dev],
+				pcm_substreams_c[dev],
+				pci_id->driver_data,
+				use_pm[dev],
+				radio_nr[dev],
+				&chip);
+	if (err < 0) {
 		snd_card_free(card);
 		return err;
 	}
@@ -2857,12 +2870,14 @@ static int snd_es1968_probe(struct pci_dev *pci,
 		break;
 	}
 
-	if ((err = snd_es1968_pcm(chip, 0)) < 0) {
+	err = snd_es1968_pcm(chip, 0);
+	if (err < 0) {
 		snd_card_free(card);
 		return err;
 	}
 
-	if ((err = snd_es1968_mixer(chip)) < 0) {
+	err = snd_es1968_mixer(chip);
+	if (err < 0) {
 		snd_card_free(card);
 		return err;
 	}
@@ -2880,13 +2895,13 @@ static int snd_es1968_probe(struct pci_dev *pci,
 		}
 	}
 	if (enable_mpu[dev]) {
-		if ((err = snd_mpu401_uart_new(card, 0, MPU401_HW_MPU401,
-					       chip->io_port + ESM_MPU401_PORT,
-					       MPU401_INFO_INTEGRATED |
-					       MPU401_INFO_IRQ_HOOK,
-					       -1, &chip->rmidi)) < 0) {
+		err = snd_mpu401_uart_new(card, 0, MPU401_HW_MPU401,
+					  chip->io_port + ESM_MPU401_PORT,
+					  MPU401_INFO_INTEGRATED |
+					  MPU401_INFO_IRQ_HOOK,
+					  -1, &chip->rmidi);
+		if (err < 0)
 			dev_warn(card->dev, "skipping MPU-401 MIDI support..\n");
-		}
 	}
 
 	snd_es1968_create_gameport(chip, dev);
@@ -2907,7 +2922,8 @@ static int snd_es1968_probe(struct pci_dev *pci,
 	sprintf(card->longname, "%s at 0x%lx, irq %i",
 		card->shortname, chip->io_port, 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: es1968: Use common error handling code in two functions

[SF Markus Elfring]

From: Markus Elfring <elfring@users.sourceforge.net>
Date: Wed, 15 Nov 2017 09:04:41 +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/es1968.c | 66 ++++++++++++++++++++++++++++--------------------------
 1 file changed, 34 insertions(+), 32 deletions(-)

diff --git a/sound/pci/es1968.c b/sound/pci/es1968.c
index d68980087f93..7777ec583e20 100644
--- a/sound/pci/es1968.c
+++ b/sound/pci/es1968.c
@@ -2702,14 +2702,14 @@ static int snd_es1968_create(struct snd_card *card,
 	    dma_set_coherent_mask(&pci->dev, DMA_BIT_MASK(28)) < 0) {
 		dev_err(card->dev,
 			"architecture does not support 28bit PCI busmaster DMA\n");
-		pci_disable_device(pci);
-		return -ENXIO;
+		err = -ENXIO;
+		goto disable_device;
 	}
 
 	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
 	if (! chip) {
-		pci_disable_device(pci);
-		return -ENOMEM;
+		err = -ENOMEM;
+		goto disable_device;
 	}
 
 	/* Set Vars */
@@ -2730,15 +2730,14 @@ static int snd_es1968_create(struct snd_card *card,
 	err = pci_request_regions(pci, "ESS Maestro");
 	if (err < 0) {
 		kfree(chip);
-		pci_disable_device(pci);
-		return err;
+		goto disable_device;
 	}
 	chip->io_port = pci_resource_start(pci, 0);
 	if (request_irq(pci->irq, snd_es1968_interrupt, IRQF_SHARED,
 			KBUILD_MODNAME, chip)) {
 		dev_err(card->dev, "unable to grab IRQ %d\n", pci->irq);
-		snd_es1968_free(chip);
-		return -EBUSY;
+		err = -EBUSY;
+		goto free_sound_chip;
 	}
 	chip->irq = pci->irq;
 	        
@@ -2775,20 +2774,17 @@ static int snd_es1968_create(struct snd_card *card,
 	snd_es1968_chip_init(chip);
 
 	err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
-	if (err < 0) {
-		snd_es1968_free(chip);
-		return err;
-	}
+	if (err < 0)
+		goto free_sound_chip;
 
 #ifdef CONFIG_SND_ES1968_RADIO
 	/* don't play with GPIOs on laptops */
 	if (chip->pci->subsystem_vendor != 0x125d)
 		goto no_radio;
 	err = v4l2_device_register(&pci->dev, &chip->v4l2_dev);
-	if (err < 0) {
-		snd_es1968_free(chip);
-		return err;
-	}
+	if (err < 0)
+		goto free_sound_chip;
+
 	chip->tea.v4l2_dev = &chip->v4l2_dev;
 	chip->tea.private_data = chip;
 	chip->tea.radio_nr = radio_nr;
@@ -2810,6 +2806,14 @@ static int snd_es1968_create(struct snd_card *card,
 	*chip_ret = chip;
 
 	return 0;
+
+disable_device:
+	pci_disable_device(pci);
+	return err;
+
+free_sound_chip:
+	snd_es1968_free(chip);
+	return err;
 }
 
 
@@ -2849,10 +2853,9 @@ static int snd_es1968_probe(struct pci_dev *pci,
 				use_pm[dev],
 				radio_nr[dev],
 				&chip);
-	if (err < 0) {
-		snd_card_free(card);
-		return err;
-	}
+	if (err < 0)
+		goto free_card;
+
 	card->private_data = chip;
 
 	switch (chip->type) {
@@ -2871,16 +2874,12 @@ static int snd_es1968_probe(struct pci_dev *pci,
 	}
 
 	err = snd_es1968_pcm(chip, 0);
-	if (err < 0) {
-		snd_card_free(card);
-		return err;
-	}
+	if (err < 0)
+		goto free_card;
 
 	err = snd_es1968_mixer(chip);
-	if (err < 0) {
-		snd_card_free(card);
-		return err;
-	}
+	if (err < 0)
+		goto free_card;
 
 	if (enable_mpu[dev] == 2) {
 		/* check the black list */
@@ -2923,13 +2922,16 @@ static int snd_es1968_probe(struct pci_dev *pci,
 		card->shortname, chip->io_port, 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_es1968_remove(struct pci_dev *pci)
-- 
2.15.0

[PATCH 3/3] ALSA: es1968: Use common error handling code in snd_es1968_capture_open()

[SF Markus Elfring]

From: Markus Elfring <elfring@users.sourceforge.net>
Date: Wed, 15 Nov 2017 09:30:00 +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/es1968.c | 31 +++++++++++++++++--------------
 1 file changed, 17 insertions(+), 14 deletions(-)

diff --git a/sound/pci/es1968.c b/sound/pci/es1968.c
index 7777ec583e20..fc45fab258c1 100644
--- a/sound/pci/es1968.c
+++ b/sound/pci/es1968.c
@@ -1589,23 +1589,20 @@ static int snd_es1968_capture_open(struct snd_pcm_substream *substream)
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct es1968 *chip = snd_pcm_substream_chip(substream);
 	struct esschan *es;
-	int apu1, apu2;
+	int apu1, apu2, rc;
 
 	apu1 = snd_es1968_alloc_apu_pair(chip, ESM_APU_PCM_CAPTURE);
 	if (apu1 < 0)
 		return apu1;
 	apu2 = snd_es1968_alloc_apu_pair(chip, ESM_APU_PCM_RATECONV);
 	if (apu2 < 0) {
-		snd_es1968_free_apu_pair(chip, apu1);
-		return apu2;
+		rc = apu2;
+		goto free_first_pair;
 	}
 	
 	es = kzalloc(sizeof(*es), GFP_KERNEL);
-	if (!es) {
-		snd_es1968_free_apu_pair(chip, apu1);
-		snd_es1968_free_apu_pair(chip, apu2);
-		return -ENOMEM;
-	}
+	if (!es)
+		goto e_nomem;
 
 	es->apu[0] = apu1;
 	es->apu[1] = apu1 + 1;
@@ -1621,12 +1618,9 @@ static int snd_es1968_capture_open(struct snd_pcm_substream *substream)
 
 	/* get mixbuffer */
 	es->mixbuf = snd_es1968_new_memory(chip, ESM_MIXBUF_SIZE);
-	if (!es->mixbuf) {
-		snd_es1968_free_apu_pair(chip, apu1);
-		snd_es1968_free_apu_pair(chip, apu2);
-		kfree(es);
-                return -ENOMEM;
-        }
+	if (!es->mixbuf)
+		goto free_data;
+
 	memset(es->mixbuf->buf.area, 0, ESM_MIXBUF_SIZE);
 
 	runtime->private_data = es;
@@ -1640,6 +1634,15 @@ static int snd_es1968_capture_open(struct snd_pcm_substream *substream)
 	spin_unlock_irq(&chip->substream_lock);
 
 	return 0;
+
+free_data:
+	kfree(es);
+e_nomem:
+	rc = -ENOMEM;
+	snd_es1968_free_apu_pair(chip, apu2);
+free_first_pair:
+	snd_es1968_free_apu_pair(chip, apu1);
+	return rc;
 }
 
 static int snd_es1968_playback_close(struct snd_pcm_substream *substream)
-- 
2.15.0