From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Date: Tue, 16 May 2017 14:09:04 +0200
Subject: of: irq: use of_irq_get() in of_irq_to_resource()
Git-commit: 7a4228bbff769ebf449981a4248616db9f0cffec
Patch-mainline: v4.13-rc1
References: fate#326470
of_irq_to_resource() currently uses irq_of_parse_and_map() to
translate a DT interrupt specification into a Linux virtual interrupt
number. While this works in most cases, irq_of_parse_and_map() doesn't
properly handle the case where the interrupt controller is not yet
available (due to deferred probing for example).
So instead, use of_irq_get(), which is implemented exactly like
irq_of_parse_and_map(), with the exception that if the interrupt
controller is not yet available, it returns -EPROBE_DEFER. Obviously,
we also handle this error and bail out from of_irq_to_resource() when
of_irq_get() returns an error.
This allows to avoid silly error messages at boot time caused by
irq_create_of_mapping() when the interrupt controller is not
available:
[ 0.153168] irq: no irq domain found for /ap806/config-space@f0000000/interrupt-controller@3f0100 !
[ 0.154041] irq: no irq domain found for /cp110-master/config-space@f2000000/interrupt-controller@1e0000 !
[ 0.154124] irq: no irq domain found for /cp110-master/config-space@f2000000/interrupt-controller@1e0000 !
[ 0.154207] irq: no irq domain found for /cp110-master/config-space@f2000000/interrupt-controller@1e0000 !
[ 0.154437] irq: no irq domain found for /cp110-master/config-space@f2000000/interrupt-controller@1e0000 !
[ 0.154518] irq: no irq domain found for /cp110-master/config-space@f2000000/interrupt-controller@1e0000 !
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@suse.com>
---
drivers/of/irq.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/of/irq.c b/drivers/of/irq.c
index d11437cb1187..6ce72aa65425 100644
--- a/drivers/of/irq.c
+++ b/drivers/of/irq.c
@@ -369,7 +369,10 @@ EXPORT_SYMBOL_GPL(of_irq_parse_one);
*/
int of_irq_to_resource(struct device_node *dev, int index, struct resource *r)
{
- int irq = irq_of_parse_and_map(dev, index);
+ int irq = of_irq_get(dev, index);
+
+ if (irq < 0)
+ return irq;
/* Only dereference the resource if both the
* resource and the irq are valid. */
--
2.11.0