linux-kernel - BUG at cpuidle_play

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Message-ID: <4F7E0884.5090602@suse.cz>
Date:	Thu, 05 Apr 2012 23:03:00 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	Boris Ostrovsky <boris.ostrovsky@....com>
CC:	Len Brown <len.brown@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	the arch/x86 maintainers <x86@...nel.org>,
	Jiri Slaby <jirislaby@...il.com>
Subject: BUG at cpuidle_play_dead

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,
-- 
js
suse labs

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