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authorLen Brown <len.brown@intel.com>2009-08-02 12:10:02 -0400
committerLen Brown <len.brown@intel.com>2009-08-02 12:10:02 -0400
commit6a61487791a8b8f85542c51132e8c7ed9bc7fd0b (patch)
treeb8e090711245de8208d4af5789d45f96848e5adb /drivers/acpi
parentf63440eff06265fc56e73044f8727b12641b33f1 (diff)
parent74b5820808215f65b70b05a099d6d3c969b82689 (diff)
Merge branch 'bugzilla-13751' into release
Diffstat (limited to 'drivers/acpi')
-rw-r--r--drivers/acpi/osl.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index 71670719d61a..5691f165a952 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -189,11 +189,36 @@ acpi_status __init acpi_os_initialize(void)
return AE_OK;
}
+static void bind_to_cpu0(struct work_struct *work)
+{
+ set_cpus_allowed(current, cpumask_of_cpu(0));
+ kfree(work);
+}
+
+static void bind_workqueue(struct workqueue_struct *wq)
+{
+ struct work_struct *work;
+
+ work = kzalloc(sizeof(struct work_struct), GFP_KERNEL);
+ INIT_WORK(work, bind_to_cpu0);
+ queue_work(wq, work);
+}
+
acpi_status acpi_os_initialize1(void)
{
+ /*
+ * On some machines, a software-initiated SMI causes corruption unless
+ * the SMI runs on CPU 0. An SMI can be initiated by any AML, but
+ * typically it's done in GPE-related methods that are run via
+ * workqueues, so we can avoid the known corruption cases by binding
+ * the workqueues to CPU 0.
+ */
kacpid_wq = create_singlethread_workqueue("kacpid");
+ bind_workqueue(kacpid_wq);
kacpi_notify_wq = create_singlethread_workqueue("kacpi_notify");
+ bind_workqueue(kacpi_notify_wq);
kacpi_hotplug_wq = create_singlethread_workqueue("kacpi_hotplug");
+ bind_workqueue(kacpi_hotplug_wq);
BUG_ON(!kacpid_wq);
BUG_ON(!kacpi_notify_wq);
BUG_ON(!kacpi_hotplug_wq);