[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>
This commit is contained in:
parent
d7fa706ce2
commit
4211a30349
|
@ -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;
|
||||
|
||||
|
|
Loading…
Reference in a new issue