2022-02-28 09:48:53

by Jiasheng Jiang

Subject: [PATCH] ALSA: spi: Add check for clk_enable()

As the potential failure of the clk_enable(),
it should be better to check it and return error
if fails.

Fixes: 3568459a5113 ("ALSA: at73c213: manage SSC clock")
Signed-off-by: Jiasheng Jiang <[email protected]>
---
sound/spi/at73c213.c | 27 +++++++++++++++++++++------
1 file changed, 21 insertions(+), 6 deletions(-)

diff --git a/sound/spi/at73c213.c b/sound/spi/at73c213.c
index 76c0e37a838c..8a2da6b1012e 100644
--- a/sound/spi/at73c213.c
+++ b/sound/spi/at73c213.c
@@ -218,7 +218,9 @@ static int snd_at73c213_pcm_open(struct snd_pcm_substream *substream)
runtime->hw = snd_at73c213_playback_hw;
chip->substream = substream;

- clk_enable(chip->ssc->clk);
+ err = clk_enable(chip->ssc->clk);
+ if (err)
+ return err;

return 0;
}
@@ -776,7 +778,9 @@ static int snd_at73c213_chip_init(struct snd_at73c213 *chip)
goto out;

/* Enable DAC master clock. */
- clk_enable(chip->board->dac_clk);
+ retval = clk_enable(chip->board->dac_clk);
+ if (retval)
+ goto out;

/* Initialize at73c213 on SPI bus. */
retval = snd_at73c213_write_reg(chip, DAC_RST, 0x04);
@@ -889,7 +893,9 @@ static int snd_at73c213_dev_init(struct snd_card *card,
chip->card = card;
chip->irq = -1;

- clk_enable(chip->ssc->clk);
+ retval = clk_enable(chip->ssc->clk);
+ if (retval)
+ return retval;

retval = request_irq(irq, snd_at73c213_interrupt, 0, "at73c213", chip);
if (retval) {
@@ -1008,7 +1014,9 @@ static int snd_at73c213_remove(struct spi_device *spi)
int retval;

/* Stop playback. */
- clk_enable(chip->ssc->clk);
+ retval = clk_enable(chip->ssc->clk);
+ if (retval)
+ goto out;
ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXDIS));
clk_disable(chip->ssc->clk);

@@ -1088,9 +1096,16 @@ static int snd_at73c213_resume(struct device *dev)
{
struct snd_card *card = dev_get_drvdata(dev);
struct snd_at73c213 *chip = card->private_data;
+ int retval;

- clk_enable(chip->board->dac_clk);
- clk_enable(chip->ssc->clk);
+ retval = clk_enable(chip->board->dac_clk);
+ if (retval)
+ return retval;
+ retval = clk_enable(chip->ssc->clk);
+ if (retval) {
+ clk_disable(chip->board->dac_clk);
+ return retval;
+ }
ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXEN));

return 0;
--
2.25.1

2022-02-28 17:48:24

by Takashi Iwai

Subject: Re: [PATCH] ALSA: spi: Add check for clk_enable()

On Mon, 28 Feb 2022 03:28:39 +0100,
Jiasheng Jiang wrote:
>
> As the potential failure of the clk_enable(),
> it should be better to check it and return error
> if fails.
>
> Fixes: 3568459a5113 ("ALSA: at73c213: manage SSC clock")
> Signed-off-by: Jiasheng Jiang <[email protected]>

Thanks, applied now.


Takashi