[PATCH] powernow-k8 crash workaround

From: Andrew Morton <[email protected]> Work around the oops reported in http://bugzilla.kernel.org/show_bug.cgi?id=6478. Thanks to Ralf Hildebrandt <[email protected]> for testing and reporting. Acked-by: Dave Jones <[email protected]> Cc: "Brown, Len" <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
chewitt · Jun 10, 2006 · a913f50 · a913f50
1 parent 670bd95
commit a913f50
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/drivers/acpi/processor_perflib.c b/drivers/acpi/processor_perflib.c
@@ -577,6 +577,8 @@ acpi_processor_register_performance(struct acpi_processor_performance
 		return_VALUE(-EBUSY);
 	}
 
+	WARN_ON(!performance);
+
 	pr->performance = performance;
 
 	if (acpi_processor_get_performance_info(pr)) {
@@ -609,7 +611,8 @@ acpi_processor_unregister_performance(struct acpi_processor_performance
 		return_VOID;
 	}
 
-	kfree(pr->performance->states);
+	if (pr->performance)
+		kfree(pr->performance->states);
 	pr->performance = NULL;
 
 	acpi_cpufreq_remove_file(pr);