diff options
| author | Richard Fitzgerald <rf@opensource.cirrus.com> | 2021-10-26 13:57:22 +0100 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2021-10-26 14:31:10 +0100 |
| commit | a10148a8cf561d728c0f57994330b2da1df35577 (patch) | |
| tree | 0f409db68d265014944e9074ce7313dcc20fa40d /sound/soc/codecs/cs42l42.c | |
| parent | 6cb725b8a5cc7b9106d5d6dd5d2ca78c76913775 (diff) | |
| download | lwn-a10148a8cf561d728c0f57994330b2da1df35577.tar.gz lwn-a10148a8cf561d728c0f57994330b2da1df35577.zip | |
ASoC: cs42l42: free_irq() before powering-down on probe() fail
Relying on devm to free the irq handler on probe failure leaves a
small window of opportunity for an interrupt to become pending and
then the handler to run after the chip has been reset and powered
off.
For safety cs42l42_probe() should free the irq in the error path.
As the irq is now disabled by the driver in probe() and remove()
there is no point allocating it as a devres-managed item, so
convert to plain non-devres.
Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20211026125722.10220-3-rf@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound/soc/codecs/cs42l42.c')
| -rw-r--r-- | sound/soc/codecs/cs42l42.c | 19 |
1 files changed, 11 insertions, 8 deletions
diff --git a/sound/soc/codecs/cs42l42.c b/sound/soc/codecs/cs42l42.c index dc12842ee6e1..1029f6b3eb48 100644 --- a/sound/soc/codecs/cs42l42.c +++ b/sound/soc/codecs/cs42l42.c @@ -2078,17 +2078,16 @@ static int cs42l42_i2c_probe(struct i2c_client *i2c_client, /* Request IRQ if one was specified */ if (i2c_client->irq) { - ret = devm_request_threaded_irq(&i2c_client->dev, - i2c_client->irq, - NULL, cs42l42_irq_thread, - IRQF_ONESHOT | IRQF_TRIGGER_LOW, - "cs42l42", cs42l42); + ret = request_threaded_irq(i2c_client->irq, + NULL, cs42l42_irq_thread, + IRQF_ONESHOT | IRQF_TRIGGER_LOW, + "cs42l42", cs42l42); if (ret == -EPROBE_DEFER) { - goto err_disable; + goto err_disable_noirq; } else if (ret != 0) { dev_err(&i2c_client->dev, "Failed to request IRQ: %d\n", ret); - goto err_disable; + goto err_disable_noirq; } } @@ -2158,6 +2157,10 @@ err_shutdown: regmap_write(cs42l42->regmap, CS42L42_PWR_CTL1, 0xff); err_disable: + if (i2c_client->irq) + free_irq(i2c_client->irq, cs42l42); + +err_disable_noirq: gpiod_set_value_cansleep(cs42l42->reset_gpio, 0); err_disable_noreset: regulator_bulk_disable(ARRAY_SIZE(cs42l42->supplies), @@ -2170,7 +2173,7 @@ static int cs42l42_i2c_remove(struct i2c_client *i2c_client) struct cs42l42_private *cs42l42 = i2c_get_clientdata(i2c_client); if (i2c_client->irq) - devm_free_irq(&i2c_client->dev, i2c_client->irq, cs42l42); + free_irq(i2c_client->irq, cs42l42); /* * The driver might not have control of reset and power supplies, |