Commit 4211a303 authored by Jacob Shin's avatar Jacob Shin Committed by Linus Torvalds
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[PATCH] x86_64: Proper null pointer check in powernow_k8_get

This prevents crashes on dual core system when enough ticks are lost.

Replaces earlier patch by me.

Cc: Dave Jones <>
Signed-off-by: default avatarThomas Renninger <>
Signed-off-by: default avatarAndi Kleen <>
Signed-off-by: default avatarLinus Torvalds <>
parent d7fa706c
......@@ -46,7 +46,7 @@
#define PFX "powernow-k8: "
#define BFX PFX "BIOS error: "
#define VERSION "version 1.60.1"
#define VERSION "version 1.60.2"
#include "powernow-k8.h"
/* serialize freq changes */
......@@ -910,6 +910,9 @@ static int powernowk8_target(struct cpufreq_policy *pol, unsigned targfreq, unsi
unsigned int newstate;
int ret = -EIO;
if (!data)
return -EINVAL;
/* only run on specific CPU from here on */
oldmask = current->cpus_allowed;
set_cpus_allowed(current, cpumask_of_cpu(pol->cpu));
......@@ -969,6 +972,9 @@ static int powernowk8_verify(struct cpufreq_policy *pol)
struct powernow_k8_data *data = powernow_data[pol->cpu];
if (!data)
return -EINVAL;
return cpufreq_frequency_table_verify(pol, data->powernow_table);
......@@ -1100,6 +1106,9 @@ static unsigned int powernowk8_get (unsigned int cpu)
data = powernow_data[first_cpu(cpu_core_map[cpu])];
if (!data)
return -EINVAL;
if (!data)
return -EINVAL;
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