[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>

1 files changed, 19 insertions, 2 deletions

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index bd74a0b12176..fd69086d08d5 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;
 }