USB: don't lose disconnections during suspend

This patch (as1111) fixes a bug in the hub driver.  When a hub
resumes, disconnections that occurred while the hub was suspended are
lost.

A completely different fix for this problem has already been accepted
for 2.6.27; however the problem still needs to be handled in 2.6.26.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Tested-by: Lukas Hejtmanek <xhejtman@ics.muni.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 94789be..512d2d5 100644 (file)
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -713,18 +713,11 @@ static void hub_restart(struct usb_hub *hub, int type)
                }
 
                /* Was the power session lost while we were suspended? */
-               switch (type) {
-               case HUB_RESET_RESUME:
-                       portstatus = 0;
-                       portchange = USB_PORT_STAT_C_CONNECTION;
-                       break;
+               status = hub_port_status(hub, port1, &portstatus, &portchange);
 
-               case HUB_RESET:
-               case HUB_RESUME:
-                       status = hub_port_status(hub, port1,
-                                       &portstatus, &portchange);
-                       break;
-               }
+               /* If the device is gone, khubd will handle it later */
+               if (status == 0 && !(portstatus & USB_PORT_STAT_CONNECTION))
+                       continue;
 
                /* For "USB_PERSIST"-enabled children we must
                 * mark the child device for reset-resume and