[ARM] 3018/1: S3C2410 - check de-referenced device is really a platform device

Patch from Ben Dooks

Check that the device we are looking at is really
a platform device before trying to cast it to one
to find out the platform bus number.

Thanks to RMK for pointing this out.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 4 insertions, 1 deletions

diff --git a/arch/arm/mach-s3c2410/clock.c b/arch/arm/mach-s3c2410/clock.c
index f59608268751..8b3d5dc35de5 100644
--- a/arch/arm/mach-s3c2410/clock.c
+++ b/arch/arm/mach-s3c2410/clock.c
@@ -98,7 +98,10 @@ struct clk *clk_get(struct device *dev, const char *id)
         struct clk *clk = ERR_PTR(-ENOENT);
         int idno;
 
-        idno = (dev == NULL) ? -1 : to_platform_device(dev)->id;
+        if (dev == NULL || dev->bus != &platform_bus_type)
+                idno = -1;
+        else
+                idno = to_platform_device(dev)->id;
 
         down(&clocks_sem);