From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753217AbcI1J3I (ORCPT ); Wed, 28 Sep 2016 05:29:08 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:57484 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932252AbcI1JJA (ORCPT ); Wed, 28 Sep 2016 05:09:00 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Fabio Estevam , Marc Kleine-Budde Subject: [PATCH 4.4 56/73] can: flexcan: fix resume function Date: Wed, 28 Sep 2016 11:05:26 +0200 Message-Id: <20160928090438.127535783@linuxfoundation.org> X-Mailer: git-send-email 2.10.0 In-Reply-To: <20160928090434.509091655@linuxfoundation.org> References: <20160928090434.509091655@linuxfoundation.org> User-Agent: quilt/0.64 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Fabio Estevam commit 4de349e786a3a2d51bd02d56f3de151bbc3c3df9 upstream. On a imx6ul-pico board the following error is seen during system suspend: dpm_run_callback(): platform_pm_resume+0x0/0x54 returns -110 PM: Device 2090000.flexcan failed to resume: error -110 The reason for this suspend error is because when the CAN interface is not active the clocks are disabled and then flexcan_chip_enable() will always fail due to a timeout error. In order to fix this issue, only call flexcan_chip_enable/disable() when the CAN interface is active. Based on a patch from Dong Aisheng in the NXP kernel. Signed-off-by: Fabio Estevam Signed-off-by: Marc Kleine-Budde Signed-off-by: Greg Kroah-Hartman --- drivers/net/can/flexcan.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) --- a/drivers/net/can/flexcan.c +++ b/drivers/net/can/flexcan.c @@ -1268,11 +1268,10 @@ static int __maybe_unused flexcan_suspen struct flexcan_priv *priv = netdev_priv(dev); int err; - err = flexcan_chip_disable(priv); - if (err) - return err; - if (netif_running(dev)) { + err = flexcan_chip_disable(priv); + if (err) + return err; netif_stop_queue(dev); netif_device_detach(dev); } @@ -1285,13 +1284,17 @@ static int __maybe_unused flexcan_resume { struct net_device *dev = dev_get_drvdata(device); struct flexcan_priv *priv = netdev_priv(dev); + int err; priv->can.state = CAN_STATE_ERROR_ACTIVE; if (netif_running(dev)) { netif_device_attach(dev); netif_start_queue(dev); + err = flexcan_chip_enable(priv); + if (err) + return err; } - return flexcan_chip_enable(priv); + return 0; } static SIMPLE_DEV_PM_OPS(flexcan_pm_ops, flexcan_suspend, flexcan_resume);