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Subject[PATCH] ARM: at91: panic when the mck rate is zero
Date
If the mck rate is zero, we'll hit the following warning:

WARNING: CPU: 0 PID: 0 at arch/arm/mach-at91/at91sam926x_time.c:257 at91sam926x_pit_init+0x13c/0x260()

But the kernel will continue to try booting and face a lot of divisions by zero
when trying to handle the various clocks.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
---
arch/arm/mach-at91/at91sam926x_time.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/arch/arm/mach-at91/at91sam926x_time.c b/arch/arm/mach-at91/at91sam926x_time.c
index 0f04ffe9c5a8..f060f6371392 100644
--- a/arch/arm/mach-at91/at91sam926x_time.c
+++ b/arch/arm/mach-at91/at91sam926x_time.c
@@ -250,6 +250,8 @@ void __init at91sam926x_pit_init(void)
if (IS_ERR(mck))
panic("AT91: PIT: Unable to get mck clk\n");
pit_rate = clk_get_rate(mck) / 16;
+ if (pit_rate == 0)
+ panic("AT91: PIT: can't continue, mck rate is zero\n");
pit_cycle = (pit_rate + HZ/2) / HZ;
WARN_ON(((pit_cycle - 1) & ~AT91_PIT_PIV) != 0);

--
1.8.3.2


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