On Thu, Aug 25, 2016 at 02:26:59PM +0800, Chen-Yu Tsai wrote: > The bootloader (U-boot) sometimes uses this timer for various delays. > It uses it as a ongoing counter, and does comparisons on the current > counter value. The timer counter is never stopped. > > In some cases when the user interacts with the bootloader, or lets > it idle for some time before loading Linux, the timer may expire, > and an interrupt will be pending. This results in an unexpected > interrupt when the timer interrupt is enabled by the kernel, at > which point the event_handler isn't set yet. This results in a NULL > pointer dereference exception, panic, and no way to reboot. > > Clear any pending interrupts after we stop the timer in the probe > function to avoid this. > > Cc: stable@xxxxxxxxxxxxxxx > Signed-off-by: Chen-Yu Tsai <wens@xxxxxxxx> Acked-by: Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx> Thanks! Maxime -- Maxime Ripard, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com
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