ACPI: dock: avoid check _STA method

In some BIOSes, every _STA method call will send a notification again,
this cause freeze. And in some BIOSes, it appears _STA should be called
after _DCK. This tries to avoid calls _STA, and still keep the device
present check.

http://bugzilla.kernel.org/show_bug.cgi?id=10431

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c
index 7d2edf1..25d2161 100644 (file)
--- a/drivers/acpi/dock.c
+++ b/drivers/acpi/dock.c
@@ -604,14 +604,17 @@ static int handle_eject_request(struct dock_station *ds, u32 event)
 static void dock_notify(acpi_handle handle, u32 event, void *data)
 {
        struct dock_station *ds = data;
+       struct acpi_device *tmp;
 
        switch (event) {
        case ACPI_NOTIFY_BUS_CHECK:
-               if (!dock_in_progress(ds) && dock_present(ds)) {
+               if (!dock_in_progress(ds) && acpi_bus_get_device(ds->handle,
+                  &tmp)) {
                        begin_dock(ds);
                        dock(ds);
                        if (!dock_present(ds)) {
                                printk(KERN_ERR PREFIX "Unable to dock!\n");
+                               complete_dock(ds);
                                break;
                        }
                        atomic_notifier_call_chain(&dock_notifier_list,