patch-2.3.43 linux/drivers/usb/hub.c

• Lines: 20
• Date: Mon Feb 7 19:12:16 2000
• Orig file: v2.3.42/linux/drivers/usb/hub.c
• Orig date: Fri Jan 28 15:09:08 2000

diff -u --recursive --new-file v2.3.42/linux/drivers/usb/hub.c linux/drivers/usb/hub.c
@@ -446,8 +446,18 @@
 			}
 
 			if (portchange & USB_PORT_STAT_C_ENABLE) {
-				dbg("port %d enable change", i + 1);
+				dbg("port %d enable change, status %x", i + 1, portstatus);
 				usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_C_ENABLE);
+
+				// EM interference sometimes causes bad shielded USB devices to 
+				// be shutdown by the hub, this hack enables them again.
+				// Works at least with mouse driver. 
+				if (!(portstatus & USB_PORT_STAT_ENABLE) && 
+				    (portstatus & USB_PORT_STAT_CONNECTION)) {
+					err("already running port %i disabled by hub (EMI?), re-enabling...",
+						i + 1);
+					usb_hub_port_connect_change(dev, i);
+				}
 			}
 
 			if (portstatus & USB_PORT_STAT_SUSPEND) {