[PATCH] ACPI: fix the process flow for 0 which return from acpi_register_gsi

[MaJun]

The return value 0 from acpi_register_gsi() means irq mapping failed.
So, we should process this case in else branch.

Signed-off-by: MaJun <majun...@huawei.com>
---
 drivers/acpi/resource.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
index 56241eb..9918326 100644
--- a/drivers/acpi/resource.c
+++ b/drivers/acpi/resource.c
@@ -416,7 +416,7 @@ static void acpi_dev_get_irqresource(struct resource *res, 
u32 gsi,
 
        res->flags = acpi_dev_irq_flags(triggering, polarity, shareable);
        irq = acpi_register_gsi(NULL, gsi, triggering, polarity);
-       if (irq >= 0) {
+       if (irq > 0) {
                res->start = irq;
                res->end = irq;
        } else {
-- 
1.7.12.4