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drivers: fwnode: fix fwnode_irq_get[_byname]()

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[ Upstream commit 39d422555e ]

The fwnode_irq_get() and the fwnode_irq_get_byname() return 0 upon
device-tree IRQ mapping failure. This is contradicting the
fwnode_irq_get_byname() function documentation and can potentially be a
source of errors like:

int probe(...) {
	...

	irq = fwnode_irq_get_byname();
	if (irq <= 0)
		return irq;

	...
}

Here we do correctly check the return value from fwnode_irq_get_byname()
but the driver probe will now return success. (There was already one
such user in-tree).

Change the fwnode_irq_get_byname() to work as documented and make also the
fwnode_irq_get() follow same common convention returning a negative errno
upon failure.

Fixes: ca0acb511c ("device property: Add fwnode_irq_get_byname")
Suggested-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Suggested-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Message-ID: <3e64fe592dc99e27ef9a0b247fc49fa26b6b8a58.1685340157.git.mazziesaccount@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Matti Vaittinen 2023-05-29 09:22:33 +03:00 committed by Greg Kroah-Hartman
parent 85fd0afbfe
commit f358776ab9
1 changed files with 9 additions and 3 deletions
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12
drivers/base/property.c
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@ -987,12 +987,18 @@ EXPORT_SYMBOL(fwnode_iomap);
* @fwnode: Pointer to the firmware node
* @index: Zero-based index of the IRQ
*
* Return: Linux IRQ number on success. Other values are determined
* according to acpi_irq_get() or of_irq_get() operation.
* Return: Linux IRQ number on success. Negative errno on failure.
*/
int fwnode_irq_get(const struct fwnode_handle *fwnode, unsigned int index)
{
return fwnode_call_int_op(fwnode, irq_get, index);
int ret;
ret = fwnode_call_int_op(fwnode, irq_get, index);
/* We treat mapping errors as invalid case */
if (ret == 0)
return -EINVAL;
return ret;
}
EXPORT_SYMBOL(fwnode_irq_get);