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authorJacob Shin <jacob.shin@amd.com>2006-04-07 19:49:51 +0200
committerLinus Torvalds <torvalds@g5.osdl.org>2006-04-09 11:53:51 -0700
commit4211a30349e8d2b724cfb4ce2584604f5e59c299 (patch)
tree59fdb0b812156bbff2266cc51b22d9d608898ecf /arch
parentd7fa706ce2c29cb751c15ca00f3aa7b223e3c9f0 (diff)
[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 <davej@redhat.com> Signed-off-by: Thomas Renninger <trenn@suse.de> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/i386/kernel/cpu/cpufreq/powernow-k8.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/arch/i386/kernel/cpu/cpufreq/powernow-k8.c b/arch/i386/kernel/cpu/cpufreq/powernow-k8.c
index 6ba497c47df..7c0e160a214 100644
--- a/arch/i386/kernel/cpu/cpufreq/powernow-k8.c
+++ b/arch/i386/kernel/cpu/cpufreq/powernow-k8.c
@@ -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);
}
@@ -1103,6 +1109,9 @@ static unsigned int powernowk8_get (unsigned int cpu)
if (!data)
return -EINVAL;
+ if (!data)
+ return -EINVAL;
+
set_cpus_allowed(current, cpumask_of_cpu(cpu));
if (smp_processor_id() != cpu) {
printk(KERN_ERR PFX "limiting to CPU %d failed in powernowk8_get\n", cpu);