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Commit 9ea84ad7 authored by Eric Dumazet's avatar Eric Dumazet Committed by Robert Richter
Browse files

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: default avatarEric Dumazet <dada1@cosmosbay.com>
Signed-off-by: default avatarRobert Richter <robert.richter@amd.com>
parent 061e41fd

arch/x86/oprofile/op_model_ppro.c

+4 −0
Original line number Diff line number Diff line
@@ -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;