USB: Handle auto-transition from hot to warm reset.

USB 3.0 hubs and roothubs will automatically transition a failed hot
reset to a warm (BH) reset.  In that case, the warm reset change bit
will be set, and the link state change bit may also be set.  Change
hub_port_finish_reset to unconditionally clear those change bits for USB
3.0 hubs.  If these bits are not cleared, we may lose port change events
from the roothub.

This commit should be backported to kernels as old as 3.2, that contain
the commit 75d7cf72ab9fa01dc70877aa5c68e8ef477229dc "usbcore: refine
warm reset logic".

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Cc: stable@vger.kernel.org

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index a815fd2cc5e729287fe24b8a4b9bb4fc21082d6b..7f8f10ec127e59524fa9ea03bdedab35919c9b54 100644 (file)
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -2580,16 +2580,16 @@ static void hub_port_finish_reset(struct usb_hub *hub, int port1,
                clear_port_feature(hub->hdev,
                                port1, USB_PORT_FEAT_C_RESET);
                /* FIXME need disconnect() for NOTATTACHED device */
-               if (warm) {
+               if (hub_is_superspeed(hub->hdev)) {
                        clear_port_feature(hub->hdev, port1,
                                        USB_PORT_FEAT_C_BH_PORT_RESET);
                        clear_port_feature(hub->hdev, port1,
                                        USB_PORT_FEAT_C_PORT_LINK_STATE);
-               } else {
+               }
+               if (!warm)
                        usb_set_device_state(udev, *status
                                        ? USB_STATE_NOTATTACHED
                                        : USB_STATE_DEFAULT);
-               }
                break;
        }
 }