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oprofile: fix CPU unplug panic in ppro_stop()

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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>
This commit is contained in:
Eric Dumazet 2008-12-02 07:21:21 +01:00 committed by Robert Richter
parent 061e41fdb5
commit 9ea84ad77d
1 changed files with 4 additions and 0 deletions
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4
arch/x86/oprofile/op_model_ppro.c
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@ -156,6 +156,8 @@ static void ppro_start(struct op_msrs const * const msrs)
unsigned int low, high; unsigned int low, high;
int i; int i;
if (!reset_value)
return;
for (i = 0; i < num_counters; ++i) { for (i = 0; i < num_counters; ++i) {
if (reset_value[i]) { if (reset_value[i]) {
CTRL_READ(low, high, msrs, 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; unsigned int low, high;
int i; int i;
if (!reset_value)
return;
for (i = 0; i < num_counters; ++i) { for (i = 0; i < num_counters; ++i) {
if (!reset_value[i]) if (!reset_value[i])
continue; continue;