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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-08-06 21:16:44 +1000
committerIngo Molnar <mingo@elte.hu>2009-08-06 13:55:09 +0200
commite0d82a0a4e9841b787e6431ccfbb515546c55dc2 (patch)
tree5fe4ea05533ca0c60f90e27bd5fd9c3aacbcd668 /arch/powerpc/kernel/power5+-pmu.c
parentaf6af30c0fcd77e621638e53ef8b176bca8bd3b4 (diff)
downloadlinux-2.6.34-ux500-e0d82a0a4e9841b787e6431ccfbb515546c55dc2.tar.gz
perf_counter/powerpc: Check oprofile_cpu_type for NULL before using it
If the current CPU doesn't support performance counters, cur_cpu_spec->oprofile_cpu_type can be NULL. The current perf_counter modules don't test for that case and would thus crash at boot time. Bug reported by David Woodhouse. Reported-by: David Woodhouse <dwmw2@infradead.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Paul Mackerras <paulus@samba.org> LKML-Reference: <19066.48028.446975.501454@cargo.ozlabs.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/powerpc/kernel/power5+-pmu.c')
-rw-r--r--arch/powerpc/kernel/power5+-pmu.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/power5+-pmu.c b/arch/powerpc/kernel/power5+-pmu.c
index f4adca8e98a..31918af3e35 100644
--- a/arch/powerpc/kernel/power5+-pmu.c
+++ b/arch/powerpc/kernel/power5+-pmu.c
@@ -678,8 +678,9 @@ static struct power_pmu power5p_pmu = {
static int init_power5p_pmu(void)
{
- if (strcmp(cur_cpu_spec->oprofile_cpu_type, "ppc64/power5+")
- && strcmp(cur_cpu_spec->oprofile_cpu_type, "ppc64/power5++"))
+ if (!cur_cpu_spec->oprofile_cpu_type ||
+ (strcmp(cur_cpu_spec->oprofile_cpu_type, "ppc64/power5+")
+ && strcmp(cur_cpu_spec->oprofile_cpu_type, "ppc64/power5++")))
return -ENODEV;
return register_power_pmu(&power5p_pmu);