diff options
| -rw-r--r-- | drivers/usb/core/hub.c | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index 4f7629d1ba6a..5da5394127e9 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -4758,6 +4758,8 @@ static void hub_events(void) /* deal with port status changes */ for (i = 1; i <= hdev->maxchild; i++) { + struct usb_device *udev = hub->ports[i - 1]->child; + if (test_bit(i, hub->busy_bits)) continue; connect_change = test_bit(i, hub->change_bits); @@ -4856,8 +4858,6 @@ static void hub_events(void) */ if (hub_port_warm_reset_required(hub, portstatus)) { int status; - struct usb_device *udev = - hub->ports[i - 1]->child; dev_dbg(hub_dev, "warm reset port %d\n", i); if (!udev || @@ -4874,6 +4874,24 @@ static void hub_events(void) usb_unlock_device(udev); connect_change = 0; } + /* + * On disconnect USB3 protocol ports transit from U0 to + * SS.Inactive to Rx.Detect. If this happens a warm- + * reset is not needed, but a (re)connect may happen + * before khubd runs and sees the disconnect, and the + * device may be an unknown state. + * + * If the port went through SS.Inactive without khubd + * seeing it the C_LINK_STATE change flag will be set, + * and we reset the dev to put it in a known state. + */ + } else if (udev && hub_is_superspeed(hub->hdev) && + (portchange & USB_PORT_STAT_C_LINK_STATE) && + (portstatus & USB_PORT_STAT_CONNECTION)) { + usb_lock_device(udev); + usb_reset_device(udev); + usb_unlock_device(udev); + connect_change = 0; } if (connect_change) |