[ARM] S3C: BUG_ON() if clock has already been registered
Add a simple check when registering a clock on whether
the clock has already been added to the list.
Any attempt to re-register a clock will cause the
clock list to be come looped and thus produces silent
failures when looking up clocks.
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
diff --git a/arch/arm/plat-s3c/clock.c b/arch/arm/plat-s3c/clock.c
index 35249b5..da7ac07 100644
--- a/arch/arm/plat-s3c/clock.c
+++ b/arch/arm/plat-s3c/clock.c
@@ -304,6 +304,9 @@
/* add to the list of available clocks */
+ /* Quick check to see if this clock has already been registered. */
+ BUG_ON(clk->list.prev != clk->list.next);
+
spin_lock(&clocks_lock);
list_add(&clk->list, &clocks);
spin_unlock(&clocks_lock);