[AVR32] Warn, don't BUG if clk_disable is called too many times

Print a helpful warning along with a stack dump if clk_disable is
called on a already-disabled clock. Remove the BUG_ON().

Extracted from a patch by David Brownell.

Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/arch/avr32/mach-at32ap/clock.c b/arch/avr32/mach-at32ap/clock.c
index 3d0d1097389f..49e7b12fe710 100644
--- a/arch/avr32/mach-at32ap/clock.c
+++ b/arch/avr32/mach-at32ap/clock.c
@@ -63,7 +63,11 @@ EXPORT_SYMBOL(clk_enable);
 
 static void __clk_disable(struct clk *clk)
 {
-        BUG_ON(clk->users == 0);
+        if (clk->users == 0) {
+                printk(KERN_ERR "%s: mismatched disable\n", clk->name);
+                WARN_ON(1);
+                return;
+        }
 
         if (--clk->users == 0 && clk->mode)
                 clk->mode(clk, 0);