ASoC: cs35l56: Rework IRQ allocation

The irq member was being set before calling the init function and then
cs35l56_irq_request() was called only when the init was successful.
However cs35l56_release() calls devm_free_irq() when the irq member is
set and therefore if init() fails then this will cause an attempted free
of an unallocated IRQ.

Instead pass the desired IRQ number to the cs35l56_irq_request()
function and set cs35l56->irq only when it has been successfully
allocated.

Signed-off-by: Simon Trimmer <simont@opensource.cirrus.com>
Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Link: https://lore.kernel.org/r/168147949598.26.711670799488943454@mailman-core.alsa-project.org
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: simontrimmer

sound/soc/codecs/cs35l56-i2c.c

@@ -27,7 +27,6 @@ static int cs35l56_i2c_probe(struct i2c_client *client)
 		return -ENOMEM;
 
 	cs35l56->dev = dev;
-	cs35l56->irq = client->irq;
 	cs35l56->can_hibernate = true;
 
 	i2c_set_clientdata(client, cs35l56);
@@ -43,7 +42,7 @@ static int cs35l56_i2c_probe(struct i2c_client *client)
 
 	ret = cs35l56_init(cs35l56);
 	if (ret == 0)
-		ret = cs35l56_irq_request(cs35l56);
+		ret = cs35l56_irq_request(cs35l56, client->irq);
 	if (ret < 0)
 		cs35l56_remove(cs35l56);
 

sound/soc/codecs/cs35l56-spi.c

@@ -32,15 +32,14 @@ static int cs35l56_spi_probe(struct spi_device *spi)
 	}
 
 	cs35l56->dev = &spi->dev;
-	cs35l56->irq = spi->irq;
 
 	ret = cs35l56_common_probe(cs35l56);
 	if (ret != 0)
 		return ret;
 
 	ret = cs35l56_init(cs35l56);
 	if (ret == 0)
-		ret = cs35l56_irq_request(cs35l56);
+		ret = cs35l56_irq_request(cs35l56, spi->irq);
 	if (ret < 0)
 		cs35l56_remove(cs35l56);
 

sound/soc/codecs/cs35l56.c

@@ -423,18 +423,19 @@ irqreturn_t cs35l56_irq(int irq, void *data)
 }
 EXPORT_SYMBOL_NS_GPL(cs35l56_irq, SND_SOC_CS35L56_CORE);
 
-int cs35l56_irq_request(struct cs35l56_private *cs35l56)
+int cs35l56_irq_request(struct cs35l56_private *cs35l56, int irq)
 {
 	int ret;
 
-	if (!cs35l56->irq)
+	if (!irq)
 		return 0;
 
-	ret = devm_request_threaded_irq(cs35l56->dev, cs35l56->irq, NULL,
-					cs35l56_irq,
+	ret = devm_request_threaded_irq(cs35l56->dev, irq, NULL, cs35l56_irq,
 					IRQF_ONESHOT | IRQF_SHARED | IRQF_TRIGGER_LOW,
 					"cs35l56", cs35l56);
-	if (ret < 0)
+	if (!ret)
+		cs35l56->irq = irq;
+	else
 		dev_err(cs35l56->dev, "Failed to get IRQ: %d\n", ret);
 
 	return ret;

sound/soc/codecs/cs35l56.h

@@ -74,7 +74,7 @@ int cs35l56_system_resume_no_irq(struct device *dev);
 int cs35l56_system_resume_early(struct device *dev);
 int cs35l56_system_resume(struct device *dev);
 irqreturn_t cs35l56_irq(int irq, void *data);
-int cs35l56_irq_request(struct cs35l56_private *cs35l56);
+int cs35l56_irq_request(struct cs35l56_private *cs35l56, int irq);
 int cs35l56_common_probe(struct cs35l56_private *cs35l56);
 int cs35l56_init(struct cs35l56_private *cs35l56);
 int cs35l56_remove(struct cs35l56_private *cs35l56);