Messages in this thread Patch in this message | | | From | Alexandre Belloni <> | Subject | [PATCH] ARM: at91: panic when the mck rate is zero | Date | Thu, 20 Mar 2014 17:14:22 +0100 |
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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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