From 87b1ecf01a7e4b1ec2951914baac1e3a77fac00e Mon Sep 17 00:00:00 2001 From: Sarah Sharp Date: Wed, 14 Nov 2012 15:58:52 -0800 Subject: [PATCH] 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 6c6e2da66ed7c8e467171e47333afcea93f5b0ac "usbcore: refine warm reset logic". Signed-off-by: Sarah Sharp Acked-by: Alan Stern Cc: stable@vger.kernel.org --- drivers/usb/core/hub.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index a815fd2cc5e72..7f8f10ec127e5 100644 --- 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; } } -- 2.39.5