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x86 / perf: Fix suspend to RAM on HP nx6325

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Commit 3f6da3905398826d85731247e7fbcf53400c18bd
(perf: Rework and fix the arch CPU-hotplug hooks) broke suspend to
RAM on my HP nx6325 (and most likely on other AMD-based boxes too)
by allowing amd_pmu_cpu_offline() to be executed for CPUs that are
going offline as part of the suspend process.  The problem is that
cpuhw->amd_nb may be NULL already, so the function should make sure
it's not NULL before accessing the object pointed to by it.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Rafael J. Wysocki 2010-03-21 21:51:51 +01:00 committed by Linus Torvalds
parent 220bf991b0
commit a90110c610
1 changed files with 5 additions and 3 deletions
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8
arch/x86/kernel/cpu/perf_event_amd.c
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@ -348,10 +348,12 @@ static void amd_pmu_cpu_offline(int cpu)
raw_spin_lock(&amd_nb_lock);
if (--cpuhw->amd_nb->refcnt == 0)
kfree(cpuhw->amd_nb);
if (cpuhw->amd_nb) {
if (--cpuhw->amd_nb->refcnt == 0)
kfree(cpuhw->amd_nb);
cpuhw->amd_nb = NULL;
cpuhw->amd_nb = NULL;
}
raw_spin_unlock(&amd_nb_lock);
}