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

commit e330b9a6bb35dc7097a4f02cb1ae7b6f96df92af upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 176b59f5bc4717925e174ce18d794470cf58b91e..ba66330cea674ba4b65726eabd8d79c06da33a8d 100644 (file)
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -96,7 +96,7 @@ 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;
        }
 
@@ -154,7 +154,7 @@ 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;
        }