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Diffstat (limited to 'drivers/base/platform.c')
-rw-r--r--drivers/base/platform.c40
1 files changed, 25 insertions, 15 deletions
diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 615c6b06b427..4b49641effa1 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -153,23 +153,24 @@ EXPORT_SYMBOL_GPL(devm_platform_ioremap_resource_byname);
* if (irq < 0)
* return irq;
*
- * Return: IRQ number on success, negative error number on failure.
+ * Return: non-zero IRQ number on success, negative error number on failure.
*/
int platform_get_irq_optional(struct platform_device *dev, unsigned int num)
{
+ int ret;
#ifdef CONFIG_SPARC
/* sparc does not have irqs represented as IORESOURCE_IRQ resources */
if (!dev || num >= dev->archdata.num_irqs)
return -ENXIO;
- return dev->archdata.irqs[num];
+ ret = dev->archdata.irqs[num];
+ goto out;
#else
struct resource *r;
- int ret;
if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) {
ret = of_irq_get(dev->dev.of_node, num);
if (ret > 0 || ret == -EPROBE_DEFER)
- return ret;
+ goto out;
}
r = platform_get_resource(dev, IORESOURCE_IRQ, num);
@@ -177,7 +178,7 @@ int platform_get_irq_optional(struct platform_device *dev, unsigned int num)
if (r && r->flags & IORESOURCE_DISABLED) {
ret = acpi_irq_get(ACPI_HANDLE(&dev->dev), num, r);
if (ret)
- return ret;
+ goto out;
}
}
@@ -191,13 +192,17 @@ int platform_get_irq_optional(struct platform_device *dev, unsigned int num)
struct irq_data *irqd;
irqd = irq_get_irq_data(r->start);
- if (!irqd)
- return -ENXIO;
+ if (!irqd) {
+ ret = -ENXIO;
+ goto out;
+ }
irqd_set_trigger_type(irqd, r->flags & IORESOURCE_BITS);
}
- if (r)
- return r->start;
+ if (r) {
+ ret = r->start;
+ goto out;
+ }
/*
* For the index 0 interrupt, allow falling back to GpioInt
@@ -210,11 +215,14 @@ int platform_get_irq_optional(struct platform_device *dev, unsigned int num)
ret = acpi_dev_gpio_irq_get(ACPI_COMPANION(&dev->dev), num);
/* Our callers expect -ENXIO for missing IRQs. */
if (ret >= 0 || ret == -EPROBE_DEFER)
- return ret;
+ goto out;
}
- return -ENXIO;
+ ret = -ENXIO;
#endif
+out:
+ WARN(ret == 0, "0 is an invalid IRQ number\n");
+ return ret;
}
EXPORT_SYMBOL_GPL(platform_get_irq_optional);
@@ -233,7 +241,7 @@ EXPORT_SYMBOL_GPL(platform_get_irq_optional);
* if (irq < 0)
* return irq;
*
- * Return: IRQ number on success, negative error number on failure.
+ * Return: non-zero IRQ number on success, negative error number on failure.
*/
int platform_get_irq(struct platform_device *dev, unsigned int num)
{
@@ -305,8 +313,10 @@ static int __platform_get_irq_byname(struct platform_device *dev,
}
r = platform_get_resource_byname(dev, IORESOURCE_IRQ, name);
- if (r)
+ if (r) {
+ WARN(r->start == 0, "0 is an invalid IRQ number\n");
return r->start;
+ }
return -ENXIO;
}
@@ -318,7 +328,7 @@ static int __platform_get_irq_byname(struct platform_device *dev,
*
* Get an IRQ like platform_get_irq(), but then by name rather then by index.
*
- * Return: IRQ number on success, negative error number on failure.
+ * Return: non-zero IRQ number on success, negative error number on failure.
*/
int platform_get_irq_byname(struct platform_device *dev, const char *name)
{
@@ -340,7 +350,7 @@ EXPORT_SYMBOL_GPL(platform_get_irq_byname);
* Get an optional IRQ by name like platform_get_irq_byname(). Except that it
* does not print an error message if an IRQ can not be obtained.
*
- * Return: IRQ number on success, negative error number on failure.
+ * Return: non-zero IRQ number on success, negative error number on failure.
*/
int platform_get_irq_byname_optional(struct platform_device *dev,
const char *name)