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driver core: platform: Make platform_get_irq_optional() optional

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Currently the platform_get_irq_optional() returns an error code even
if IRQ resource sumply has not been found. It prevents caller to be
error code agnostic in their error handling.

Now:
	ret = platform_get_irq_optional(...);
	if (ret != -ENXIO)
		return ret; // respect deferred probe
	if (ret > 0)
		...we get an IRQ...

After proposed change:
	ret = platform_get_irq_optional(...);
	if (ret < 0)
		return ret;
	if (ret > 0)
		...we get an IRQ...

Reported-by: Matthias Schiffer <matthias.schiffer@ew.tq-group.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20210331144526.19439-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andy Shevchenko 2021-03-31 17:45:26 +03:00 • committed by Greg Kroah-Hartman
parent 318c3e00f1
commit ed7027fdf4
1 changed files with 34 additions and 21 deletions
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55
drivers/base/platform.c
View file

@ -168,25 +168,7 @@ devm_platform_ioremap_resource_byname(struct platform_device *pdev,
EXPORT_SYMBOL_GPL(devm_platform_ioremap_resource_byname); EXPORT_SYMBOL_GPL(devm_platform_ioremap_resource_byname);
#endif /* CONFIG_HAS_IOMEM */ #endif /* CONFIG_HAS_IOMEM */
/** static int platform_do_get_irq(struct platform_device *dev, unsigned int num)
* platform_get_irq_optional - get an optional IRQ for a device
* @dev: platform device
* @num: IRQ number index
*
* Gets an IRQ for a platform device. Device drivers should check the return
* value for errors so as to not pass a negative integer value to the
* request_irq() APIs. This is the same as platform_get_irq(), except that it
* does not print an error message if an IRQ can not be obtained.
*
* For example::
*
* int irq = platform_get_irq_optional(pdev, 0);
* if (irq < 0)
* return irq;
*
* 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; int ret;
#ifdef CONFIG_SPARC #ifdef CONFIG_SPARC
@ -254,6 +236,37 @@ out:
WARN(ret == 0, "0 is an invalid IRQ number\n"); WARN(ret == 0, "0 is an invalid IRQ number\n");
return ret; return ret;
} }
/**
* platform_get_irq_optional - get an optional IRQ for a device
* @dev: platform device
* @num: IRQ number index
*
* Gets an IRQ for a platform device. Device drivers should check the return
* value for errors so as to not pass a negative integer value to the
* request_irq() APIs. This is the same as platform_get_irq(), except that it
* does not print an error message if an IRQ can not be obtained and returns
* 0 when IRQ resource has not been found.
*
* For example::
*
* int irq = platform_get_irq_optional(pdev, 0);
* if (irq < 0)
* return irq;
* if (irq > 0)
* ...we have IRQ line defined...
*
* 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;
ret = platform_do_get_irq(dev, num);
if (ret == -ENXIO)
return 0;
return ret;
}
EXPORT_SYMBOL_GPL(platform_get_irq_optional); EXPORT_SYMBOL_GPL(platform_get_irq_optional);
/** /**
@ -277,7 +290,7 @@ int platform_get_irq(struct platform_device *dev, unsigned int num)
{ {
int ret; int ret;
ret = platform_get_irq_optional(dev, num); ret = platform_do_get_irq(dev, num);
if (ret < 0 && ret != -EPROBE_DEFER) if (ret < 0 && ret != -EPROBE_DEFER)
dev_err(&dev->dev, "IRQ index %u not found\n", num); dev_err(&dev->dev, "IRQ index %u not found\n", num);
@ -295,7 +308,7 @@ int platform_irq_count(struct platform_device *dev)
{ {
int ret, nr = 0; int ret, nr = 0;
while ((ret = platform_get_irq_optional(dev, nr)) >= 0) while ((ret = platform_do_get_irq(dev, nr)) >= 0)
nr++; nr++;
if (ret == -EPROBE_DEFER) if (ret == -EPROBE_DEFER)