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genirq: Don't return error on missing optional irq_request_resources()

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[ Upstream commit 95001b756467ecc9f5973eb5e74e97699d9bbdf1 ]

Function irq_chip::irq_request_resources() is reported as optional
in the declaration of struct irq_chip.
If the parent irq_chip does not implement it, we should ignore it
and return.

Don't return error if the functions is missing.

Signed-off-by: Antonio Borneo <[email protected]>
Signed-off-by: Marc Zyngier <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Sasha Levin <[email protected]>
This commit is contained in:
Antonio Borneo 2022-05-12 18:05:44 +02:00 • committed by Greg Kroah-Hartman
commit 3fb368c0ae
1 changed files with 2 additions and 1 deletions
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3
kernel/irq/chip.c
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@ -1484,7 +1484,8 @@ int irq_chip_request_resources_parent(struct irq_data *data)
if (data->chip->irq_request_resources)
return data->chip->irq_request_resources(data);
return -ENOSYS;
/* no error on missing optional irq_chip::irq_request_resources */
return 0;
}
EXPORT_SYMBOL_GPL(irq_chip_request_resources_parent);