From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.kernel.org ([198.145.29.99]:39890 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726492AbeKOIdp (ORCPT ); Thu, 15 Nov 2018 03:33:45 -0500 Subject: patch "usb: core: Fix hub port connection events lost" added to usb-linus To: dennis.wassenberg@secunet.com, gregkh@linuxfoundation.org, mathias.nyman@linux.intel.com, stable@vger.kernel.org From: Date: Wed, 14 Nov 2018 14:28:39 -0800 Message-ID: <15422345198829@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled usb: core: Fix hub port connection events lost to my usb git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git in the usb-linus branch. The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.) The patch will hopefully also be merged in Linus's tree for the next -rc kernel release. If you have any questions about this process, please let me know. >>From 22454b79e6de05fa61a2a72d00d2eed798abbb75 Mon Sep 17 00:00:00 2001 From: Dennis Wassenberg Date: Tue, 13 Nov 2018 14:40:34 +0100 Subject: usb: core: Fix hub port connection events lost This will clear the USB_PORT_FEAT_C_CONNECTION bit in case of a hub port reset only if a device is was attached to the hub port before resetting the hub port. Using a Lenovo T480s attached to the ultra dock it was not possible to detect some usb-c devices at the dock usb-c ports because the hub_port_reset code will clear the USB_PORT_FEAT_C_CONNECTION bit after the actual hub port reset. Using this device combo the USB_PORT_FEAT_C_CONNECTION bit was set between the actual hub port reset and the clear of the USB_PORT_FEAT_C_CONNECTION bit. This ends up with clearing the USB_PORT_FEAT_C_CONNECTION bit after the new device was attached such that it was not detected. This patch will not clear the USB_PORT_FEAT_C_CONNECTION bit if there is currently no device attached to the port before the hub port reset. This will avoid clearing the connection bit for new attached devices. Signed-off-by: Dennis Wassenberg Acked-by: Mathias Nyman Cc: stable Signed-off-by: Greg Kroah-Hartman --- drivers/usb/core/hub.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index d9bd7576786a..0f9381b69a3b 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -2850,7 +2850,9 @@ static int hub_port_reset(struct usb_hub *hub, int port1, USB_PORT_FEAT_C_BH_PORT_RESET); usb_clear_port_feature(hub->hdev, port1, USB_PORT_FEAT_C_PORT_LINK_STATE); - usb_clear_port_feature(hub->hdev, port1, + + if (udev) + usb_clear_port_feature(hub->hdev, port1, USB_PORT_FEAT_C_CONNECTION); /* -- 2.19.1