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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2009-08-06 21:16:44 +1000 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-08-06 13:55:09 +0200 |
| commit | e0d82a0a4e9841b787e6431ccfbb515546c55dc2 (patch) | |
| tree | 5fe4ea05533ca0c60f90e27bd5fd9c3aacbcd668 /arch/powerpc/kernel/power7-pmu.c | |
| parent | af6af30c0fcd77e621638e53ef8b176bca8bd3b4 (diff) | |
| download | linux-e0d82a0a4e9841b787e6431ccfbb515546c55dc2.tar.gz linux-e0d82a0a4e9841b787e6431ccfbb515546c55dc2.tar.bz2 linux-e0d82a0a4e9841b787e6431ccfbb515546c55dc2.zip | |
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/power7-pmu.c')
| -rw-r--r-- | arch/powerpc/kernel/power7-pmu.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/power7-pmu.c b/arch/powerpc/kernel/power7-pmu.c index 5a9f5cbd40a4..388cf57ad827 100644 --- a/arch/powerpc/kernel/power7-pmu.c +++ b/arch/powerpc/kernel/power7-pmu.c @@ -366,7 +366,8 @@ static struct power_pmu power7_pmu = { static int init_power7_pmu(void) { - if (strcmp(cur_cpu_spec->oprofile_cpu_type, "ppc64/power7")) + if (!cur_cpu_spec->oprofile_cpu_type || + strcmp(cur_cpu_spec->oprofile_cpu_type, "ppc64/power7")) return -ENODEV; return register_power_pmu(&power7_pmu); |