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authorDave Jones <davej@redhat.com>2009-08-04 14:03:25 -0400
committerDave Jones <davej@redhat.com>2009-08-04 14:32:11 -0400
commit4bc5d34135039566b8d6efa2de7515b2be505da8 (patch)
tree9405817331384c08569d87aee44c1a4160bad9d0
parentd5194decd0a6f792b2789eebd4ddf022a248f655 (diff)
[CPUFREQ] Make cpufreq suspend code conditional on powerpc.
The suspend code runs with interrupts disabled, and the powerpc workaround we do in the cpufreq suspend hook calls the drivers ->get method. powernow-k8's ->get does an smp_call_function_single which needs interrupts enabled cpufreq's suspend/resume code was added in 42d4dc3f4e1e to work around a hardware problem on ppc powerbooks. If we make all this code conditional on powerpc, we avoid the issue above. Signed-off-by: Dave Jones <davej@redhat.com>
-rw-r--r--drivers/cpufreq/cpufreq.c21
1 files changed, 19 insertions, 2 deletions
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index bd74a0b1217..fd69086d08d 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -1248,13 +1248,22 @@ EXPORT_SYMBOL(cpufreq_get);
static int cpufreq_suspend(struct sys_device *sysdev, pm_message_t pmsg)
{
- int cpu = sysdev->id;
int ret = 0;
+
+#ifdef __powerpc__
+ int cpu = sysdev->id;
unsigned int cur_freq = 0;
struct cpufreq_policy *cpu_policy;
dprintk("suspending cpu %u\n", cpu);
+ /*
+ * This whole bogosity is here because Powerbooks are made of fail.
+ * No sane platform should need any of the code below to be run.
+ * (it's entirely the wrong thing to do, as driver->get may
+ * reenable interrupts on some architectures).
+ */
+
if (!cpu_online(cpu))
return 0;
@@ -1313,6 +1322,7 @@ static int cpufreq_suspend(struct sys_device *sysdev, pm_message_t pmsg)
out:
cpufreq_cpu_put(cpu_policy);
+#endif /* __powerpc__ */
return ret;
}
@@ -1326,12 +1336,18 @@ out:
*/
static int cpufreq_resume(struct sys_device *sysdev)
{
- int cpu = sysdev->id;
int ret = 0;
+
+#ifdef __powerpc__
+ int cpu = sysdev->id;
struct cpufreq_policy *cpu_policy;
dprintk("resuming cpu %u\n", cpu);
+ /* As with the ->suspend method, all the code below is
+ * only necessary because Powerbooks suck.
+ * See commit 42d4dc3f4e1e for jokes. */
+
if (!cpu_online(cpu))
return 0;
@@ -1395,6 +1411,7 @@ out:
schedule_work(&cpu_policy->update);
fail:
cpufreq_cpu_put(cpu_policy);
+#endif /* __powerpc__ */
return ret;
}