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912b72a0b6
Fixes issue with Xen dom0 http://lists.xen.org/archives/html/xen-devel/2012-07/msg01838.html
35 lines
1.3 KiB
Diff
35 lines
1.3 KiB
Diff
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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Date: Thu, 16 Aug 2012 20:06:55 +0000 (+0200)
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Subject: intel_idle: Check cpu_idle_get_driver() for NULL before dereferencing it.
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X-Git-Tag: v3.6-rc3~33^2
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X-Git-Url: http://git.kernel.org/?p=linux%2Fkernel%2Fgit%2Ftorvalds%2Flinux.git;a=commitdiff_plain;h=3735d524da64b70b41c764359da36f88aded3610
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intel_idle: Check cpu_idle_get_driver() for NULL before dereferencing it.
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If the machine is booted without any cpu_idle driver set
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(b/c disable_cpuidle() has been called) we should follow
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other users of cpu_idle API and check the return value
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for NULL before using it.
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Reported-and-tested-by: Mark van Dijk <mark@internecto.net>
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Suggested-by: Jan Beulich <JBeulich@suse.com>
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Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
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---
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diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c
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index f559088..e872617 100644
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--- a/drivers/idle/intel_idle.c
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+++ b/drivers/idle/intel_idle.c
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@@ -606,8 +606,9 @@ static int __init intel_idle_init(void)
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intel_idle_cpuidle_driver_init();
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retval = cpuidle_register_driver(&intel_idle_driver);
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if (retval) {
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+ struct cpuidle_driver *drv = cpuidle_get_driver();
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printk(KERN_DEBUG PREFIX "intel_idle yielding to %s",
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- cpuidle_get_driver()->name);
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+ drv ? drv->name : "none");
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return retval;
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}
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