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| author | Eric Dumazet <dada1@cosmosbay.com> | 2008-12-02 07:21:21 +0100 |
|---|---|---|
| committer | Robert Richter <robert.richter@amd.com> | 2008-12-03 15:58:51 +0100 |
| commit | 9ea84ad77d635bdb76c9a08f44f21a9af98359ee (patch) | |
| tree | f1ec975d7c665d379d5b456a2a9951cdae59de2b /arch | |
| parent | 061e41fdb5047b1fb161e89664057835935ca1d2 (diff) | |
| download | linux-9ea84ad77d635bdb76c9a08f44f21a9af98359ee.tar.gz linux-9ea84ad77d635bdb76c9a08f44f21a9af98359ee.tar.bz2 linux-9ea84ad77d635bdb76c9a08f44f21a9af98359ee.zip | |
oprofile: fix CPU unplug panic in ppro_stop()
If oprofile statically compiled in kernel, a cpu unplug triggers
a panic in ppro_stop(), because a NULL pointer is dereferenced.
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: Robert Richter <robert.richter@amd.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/oprofile/op_model_ppro.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/oprofile/op_model_ppro.c b/arch/x86/oprofile/op_model_ppro.c index 716d26f0e5d4..e9f80c744cf3 100644 --- a/arch/x86/oprofile/op_model_ppro.c +++ b/arch/x86/oprofile/op_model_ppro.c @@ -156,6 +156,8 @@ static void ppro_start(struct op_msrs const * const msrs) unsigned int low, high; int i; + if (!reset_value) + return; for (i = 0; i < num_counters; ++i) { if (reset_value[i]) { CTRL_READ(low, high, msrs, i); @@ -171,6 +173,8 @@ static void ppro_stop(struct op_msrs const * const msrs) unsigned int low, high; int i; + if (!reset_value) + return; for (i = 0; i < num_counters; ++i) { if (!reset_value[i]) continue; |