dock: fix for ATA bay in a dock station

an ATA bay can be in a dock and itself can be ejected separately.
This patch handles such eject bay. Found by Holger.

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

1 files changed, 10 insertions, 4 deletions

diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c
index ac7dfefcb50b..c877cc526002 100644
--- a/drivers/acpi/dock.c
+++ b/drivers/acpi/dock.c
@@ -609,6 +609,7 @@ register_hotplug_dock_device(acpi_handle handle, struct acpi_dock_ops *ops,
 {
         struct dock_dependent_device *dd;
         struct dock_station *dock_station;
+        int ret = -EINVAL;
 
         if (!dock_station_count)
                 return -ENODEV;
@@ -618,16 +619,21 @@ register_hotplug_dock_device(acpi_handle handle, struct acpi_dock_ops *ops,
          * this would include the dock station itself
          */
         list_for_each_entry(dock_station, &dock_stations, sibiling) {
+                /*
+                 * An ATA bay can be in a dock and itself can be ejected
+                 * seperately, so there are two 'dock stations' which need the
+                 * ops
+                 */
                 dd = find_dock_dependent_device(dock_station, handle);
                 if (dd) {
                         dd->ops = ops;
                         dd->context = context;
                         dock_add_hotplug_device(dock_station, dd);
-                        return 0;
+                        ret = 0;
                 }
         }
 
-        return -EINVAL;
+        return ret;
 }
 
 EXPORT_SYMBOL_GPL(register_hotplug_dock_device);
@@ -1078,8 +1084,8 @@ find_dock(acpi_handle handle, u32 lvl, void *context, void **rv)
 static acpi_status
 find_bay(acpi_handle handle, u32 lvl, void *context, void **rv)
 {
-        /* If bay is in a dock, it's already handled */
-        if (is_ejectable_bay(handle) && !is_dock_device(handle))
+        /* If bay is a dock, it's already handled */
+        if (is_ejectable_bay(handle) && !is_dock(handle))
                 dock_add(handle);
         return AE_OK;
 }