hi all:
When I plug in usb3.0 device for stressing test, once
usb_get_device_descriptor fail in hub_port_init.
we will call hub_port_disable(hub, port1, 0);
And usb3.0 device may not recover successfully only with below function
retval = hub_port_reset(hub, port1, udev, delay, false);
when we try to save back the device.
in hub_port_connect_change
--> for (i = 0; i < SET_CONFIG_TRIES; i++) {
--> hub_port_init
--> hub_port_reset(hub, port1, udev, delay, false);
--> usb_get_device_descriptor
(fail) --> hub_port_disable(hub, port1, 0);
( I list rough function calls flow like above)
For covering this error handling, shall we add patch like below?
diff --git drivers/usb/core/hub.c b/linux-3.8.2/drivers/usb/core/hub.c
index 64af693..599de96 100644
--- a/linux-3.8.2/drivers/usb/core/hub.c
+++ b/linux-3.8.2/drivers/usb/core/hub.c
@@ -4451,6 +4453,10 @@ static int hub_port_reset(struct usb_hub *hub, int port1,
if (retval) {
hub_port_disable(hub, port1, 0);
update_devnum(udev, devnum); /* for disconnect processing */
+ if(udev->speed == USB_SPEED_SUPER)
+ hub_port_reset(hub, port1, udev,
+ HUB_BH_RESET_TIME, true);
}
mutex_unlock(&usb_address0_mutex);
return retval;
Thanks for your kind help in advance,
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