Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932966Ab3FEWE5 (ORCPT ); Wed, 5 Jun 2013 18:04:57 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:37691 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932416Ab3FEVfP (ORCPT ); Wed, 5 Jun 2013 17:35:15 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Alan Stern Subject: [ 029/127] USB: UHCI: fix for suspend of virtual HP controller Date: Wed, 5 Jun 2013 14:33:16 -0700 Message-Id: <20130605213221.290787068@linuxfoundation.org> X-Mailer: git-send-email 1.8.3.rc0.20.gb99dd2e In-Reply-To: <20130605213217.966891866@linuxfoundation.org> References: <20130605213217.966891866@linuxfoundation.org> User-Agent: quilt/0.60-5.1.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1663 Lines: 45 3.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Alan Stern commit 997ff893603c6455da4c5e26ba1d0f81adfecdfc upstream. HP's virtual UHCI host controller takes a long time to suspend (several hundred microseconds), even when no devices are attached. This provokes a warning message from uhci-hcd in the auto-stop case. To prevent this from happening, this patch adds a test to avoid performing an auto-stop when the wait_for_hp quirk flag is set. The controller will still suspend through the normal runtime PM mechanism. And since that pathway includes a 1-ms delay, the slowness of the virtual hardware won't matter. Signed-off-by: Alan Stern Reported-and-tested-by: ZhenHua Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/uhci-hub.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/drivers/usb/host/uhci-hub.c +++ b/drivers/usb/host/uhci-hub.c @@ -225,7 +225,8 @@ static int uhci_hub_status_data(struct u /* auto-stop if nothing connected for 1 second */ if (any_ports_active(uhci)) uhci->rh_state = UHCI_RH_RUNNING; - else if (time_after_eq(jiffies, uhci->auto_stop_time)) + else if (time_after_eq(jiffies, uhci->auto_stop_time) && + !uhci->wait_for_hp) suspend_rh(uhci, UHCI_RH_AUTO_STOPPED); break; -- 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/