Commit 1dc482b6 authored Jul 11, 2017 by Mark Salter Committed by Rafael J. Wysocki Jul 12, 2017

ACPI / irq: Fix return code of acpi_gsi_to_irq()



The function acpi_gsi_to_irq() must return 0 on success as the caller
ghes_probe expects an 0 for success. This change also matches x86
implementation.

This patch was submitted around 4.5 timeframe but wasn't pushed because
it didn't fix a real problem. Now that RAS/GHES patches are in kernel,
this fixes an error seen on a Mustang (arm64) platform:

    GHES: Failed to map GSI to IRQ for generic hardware error source: 2
    GHES: probe of GHES.2 failed with error 81

Signed-off-by: Tuan Phan <tphan@apm.com>
Signed-off-by: Loc Ho <lho@apm.com>
Signed-off-by: Mark Salter <msalter@redhat.com>
Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

parent 6f7da290

drivers/acpi/irq.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -24,7 +24,7 @@ static struct fwnode_handle *acpi_gsi_domain_id;
		*
		* irq location updated with irq value [>0 on success, 0 on failure]
		*
		* Returns: linux IRQ number on success (>0)
		* Returns: 0 on success
		* -EINVAL on failure
		*/
		int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
		@@ -37,7 +37,7 @@ int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
		* *irq == 0 means no mapping, that should
		* be reported as a failure
		*/
		return (irq > 0) ? irq : -EINVAL;
		return (*irq > 0) ? 0 : -EINVAL;
		}
		EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);