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SubjectRe: BUG at cpuidle_play_dead
On 04/05/12 17:03, Jiri Slaby wrote:
> Hi,
>
> I'm hitting this BUG as the last thing during shutdown:
> BUG: unable to handle kernel NULL pointer dereference at 00000000000002d8
> IP: [<ffffffff814ab60d>] cpuidle_play_dead+0x1d/0xb0
>
>
> It's because drv is NULL. The problem is gone if I do this:
> --- a/drivers/cpuidle/cpuidle.c
> +++ b/drivers/cpuidle/cpuidle.c
> @@ -83,6 +83,11 @@ int cpuidle_play_dead(void)
> int i, dead_state = -1;
> int power_usage = -1;
>
> + if (!drv) {
> + printk("DRIVER IS NULL\n");
> + return -ENODEV;
> + }
> +
> /* Find lowest-power state that supports long-term idle */
> for (i = CPUIDLE_DRIVER_STATE_START; i< drv->state_count; i++) {
> struct cpuidle_state *s =&drv->states[i];
>
> thanks,


This was already fixed in https://lkml.org/lkml/2012/3/31/249.

Len, please apply that patch.

Thanks.
-boris



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