platform: don't return 0 from platform_get_irq[_byname]() on error

of_irq_get[_byname]() return 0 iff  irq_create_of_mapping() call fails.
Returning both  error code and 0 on failure is a sign of a misdesigned API,
it makes the failure check unnecessarily complex and error prone. We should
rely  on the platform IRQ resource in this case, not return 0,  especially
as 0 can be  a valid  IRQ resource too...

Fixes: aff008ad813c ("platform_get_irq: Revert to platform_get_resource if of_irq_get fails")
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
CC: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index f57fff3f268b..44c9d4daf510 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -97,7 +97,7 @@ int platform_get_irq(struct platform_device *dev, unsigned int num)
                 int ret;
 
                 ret = of_irq_get(dev->dev.of_node, num);
-                if (ret >= 0 || ret == -EPROBE_DEFER)
+                if (ret > 0 || ret == -EPROBE_DEFER)
                         return ret;
         }
 
@@ -175,7 +175,7 @@ int platform_get_irq_byname(struct platform_device *dev, const char *name)
                 int ret;
 
                 ret = of_irq_get_byname(dev->dev.of_node, name);
-                if (ret >= 0 || ret == -EPROBE_DEFER)
+                if (ret > 0 || ret == -EPROBE_DEFER)
                         return ret;
         }