This is a note to let you know that I've just added the patch titled
genirq: Don't return error on missing optional irq_request_resources()
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
genirq-don-t-return-error-on-missing-optional-irq_re.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit cd0bf269b4bd3e831a0a1f44620e12f2091ce7f4
Author: Antonio Borneo <antonio.borneo@xxxxxxxxxxx>
Date: Thu May 12 18:05:44 2022 +0200
genirq: Don't return error on missing optional irq_request_resources()
[ 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 <antonio.borneo@xxxxxxxxxxx>
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20220512160544.13561-1-antonio.borneo@xxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 856f0297dc73..521121c2666c 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -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);
