aboutsummaryrefslogtreecommitdiff
path: root/arch/powerpc/kernel/power5-pmu.c
diff options
context:
space:
mode:
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)
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.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/power5-pmu.c b/arch/powerpc/kernel/power5-pmu.c
index 29b2c6c0e83..867f6f66396 100644
--- a/arch/powerpc/kernel/power5-pmu.c
+++ b/arch/powerpc/kernel/power5-pmu.c
@@ -618,7 +618,8 @@ static struct power_pmu power5_pmu = {
static int init_power5_pmu(void)
{
- if (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"))
return -ENODEV;
return register_power_pmu(&power5_pmu);