tegra: clock: Avoid a divide-by-zero error
The clock fix-up for tegra is still present in the code. It causes a
divide-by-zero bug after relocation when chain-loading U-Boot from
coreboot. Fix this by adding a check.
Signed-off-by: Simon Glass <sjg@chromium.org>
Fixes: 7468676 (ARM: tegra: fix clock_get_periph_rate() for UART clocks)
diff --git a/arch/arm/mach-tegra/clock.c b/arch/arm/mach-tegra/clock.c
index 76436d8..bac4211 100644
--- a/arch/arm/mach-tegra/clock.c
+++ b/arch/arm/mach-tegra/clock.c
@@ -339,8 +339,11 @@
* return value doesn't help. In summary this clock driver is
* quite broken but I'm afraid I have no idea how to fix it
* without completely replacing it.
+ *
+ * Be careful to avoid a divide by zero error.
*/
- div -= 2;
+ if (div >= 1)
+ div -= 2;
break;
#endif
default: