Without this, under rare conditions hypervisor crashes are possible due
to this method being called without checking against NULL.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
Index: 2008年11月20日/xen/arch/x86/acpi/cpufreq/powernow.c
===================================================================
--- 2008年11月20日.orig/xen/arch/x86/acpi/cpufreq/powernow.c 2008年11月05日 
16:54:22.000000000 +0100
+++ 2008年11月20日/xen/arch/x86/acpi/cpufreq/powernow.c 2008年12月03日 
11:56:27.000000000 +0100
@@ -129,6 +129,16 @@ static int powernow_cpufreq_target(struc
 return result;
 }
 
+static int powernow_cpufreq_verify(struct cpufreq_policy *policy)
+{
+ struct powernow_cpufreq_data *data;
+
+ if (!policy || !(data = drv_data[policy->cpu]))
+ return -EINVAL;
+
+ return cpufreq_frequency_table_verify(policy, data->freq_table);
+}
+
 static int powernow_cpufreq_cpu_init(struct cpufreq_policy *policy)
 {
 unsigned int i;
@@ -243,6 +253,7 @@ static int powernow_cpufreq_cpu_exit(str
 }
 
 static struct cpufreq_driver powernow_cpufreq_driver = {
+ .verify = powernow_cpufreq_verify,
 .target = powernow_cpufreq_target,
 .init = powernow_cpufreq_cpu_init,
 .exit = powernow_cpufreq_cpu_exit
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