Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933713Ab3CLWfU (ORCPT ); Tue, 12 Mar 2013 18:35:20 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:60474 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756163Ab3CLWdn (ORCPT ); Tue, 12 Mar 2013 18:33:43 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Sarah Sharp , Alan Stern Subject: [ 098/100] USB: Fix connected device switch to Inactive state. Date: Tue, 12 Mar 2013 15:32:23 -0700 Message-Id: <20130312223133.388509842@linuxfoundation.org> X-Mailer: git-send-email 1.8.1.rc1.5.g7e0651a In-Reply-To: <20130312223122.884099393@linuxfoundation.org> References: <20130312223122.884099393@linuxfoundation.org> User-Agent: quilt/0.60-2.1.2 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3106 Lines: 94 3.8-stable review patch. If anyone has any objections, please let me know. ------------------ From: Sarah Sharp [This is upstream commit d3b9d7a9051d7024a93c76a84b2f84b3b66ad6d5. It needs to be backported to kernels as old as 3.2, because it fixes the buggy commit 65bdac5effd15d6af619b3b7218627ef4d84ed6a "USB: Handle warm reset failure on empty port."] A USB 3.0 device can transition to the Inactive state if a U1 or U2 exit transition fails. The current code in hub_events simply issues a warm reset, but does not call any pre-reset or post-reset driver methods (or unbind/rebind drivers without them). Therefore the drivers won't know their device has just been reset. hub_events should instead call usb_reset_device. This means hub_port_reset now needs to figure out whether it should issue a warm reset or a hot reset. Remove the FIXME note about needing disconnect() for a NOTATTACHED device. This patch fixes that. Signed-off-by: Sarah Sharp Acked-by: Alan Stern Signed-off-by: Greg Kroah-Hartman --- drivers/usb/core/hub.c | 30 +++++++++++++++++++++++++----- 1 file changed, 25 insertions(+), 5 deletions(-) --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -2605,7 +2605,6 @@ static void hub_port_finish_reset(struct case -ENODEV: clear_port_feature(hub->hdev, port1, USB_PORT_FEAT_C_RESET); - /* FIXME need disconnect() for NOTATTACHED device */ if (hub_is_superspeed(hub->hdev)) { clear_port_feature(hub->hdev, port1, USB_PORT_FEAT_C_BH_PORT_RESET); @@ -2639,6 +2638,18 @@ static int hub_port_reset(struct usb_hub * Some companion controllers don't like it when they mix. */ down_read(&ehci_cf_port_reset_rwsem); + } else if (!warm) { + /* + * If the caller hasn't explicitly requested a warm reset, + * double check and see if one is needed. + */ + status = hub_port_status(hub, port1, + &portstatus, &portchange); + if (status < 0) + goto done; + + if (hub_port_warm_reset_required(hub, portstatus)) + warm = true; } /* Reset the port */ @@ -4730,12 +4741,21 @@ 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); - status = hub_port_reset(hub, i, NULL, - HUB_BH_RESET_TIME, true); - if (status < 0) - hub_port_disable(hub, i, 1); + if (!udev) { + status = hub_port_reset(hub, i, + NULL, HUB_BH_RESET_TIME, + true); + if (status < 0) + hub_port_disable(hub, i, 1); + } else { + usb_lock_device(udev); + status = usb_reset_device(udev); + usb_unlock_device(udev); + } connect_change = 0; } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/