usb, xhci: Clear warm reset change event during init

commit 79c3dd8150fd5236d95766a9e662e3e932b462c9 upstream.

I noticed on my Panther Point system that I wasn't getting hotplug events
for my usb3.0 disk on a usb3 port.  I tracked it down to the fact that the
system had the warm reset change bit still set.  This seemed to block future
events from being received, including a hotplug event.

Clearing this bit during initialization allowed the hotplug event to be
received and the disk to be recognized correctly.

This patch should be backported to kernels as old as 2.6.39.

Signed-off-by: Don Zickus <dzickus@redhat.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index a428aa080a365e219857cd0b465aab5e67a4887b..210e3597091a08f4b0387769c6641e4faed500e2 100644 (file)
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -813,6 +813,12 @@ static void hub_activate(struct usb_hub *hub, enum hub_activation_type type)
                                        USB_PORT_FEAT_C_PORT_LINK_STATE);
                }
 
+               if ((portchange & USB_PORT_STAT_C_BH_RESET) &&
+                               hub_is_superspeed(hub->hdev)) {
+                       need_debounce_delay = true;
+                       clear_port_feature(hub->hdev, port1,
+                                       USB_PORT_FEAT_C_BH_PORT_RESET);
+               }
                /* We can forget about a "removed" device when there's a
                 * physical disconnect or the connect status changes.
                 */