From patchwork Tue Dec 30 14:18:55 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Emmanuel Grumbach X-Patchwork-Id: 5552451 X-Patchwork-Delegate: kvalo@adurom.com Return-Path: X-Original-To: patchwork-linux-wireless@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 3CBF8BF6C3 for ; Tue, 30 Dec 2014 14:20:16 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 7EA4B20160 for ; Tue, 30 Dec 2014 14:20:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A52EB2012E for ; Tue, 30 Dec 2014 14:20:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751987AbaL3OUI (ORCPT ); Tue, 30 Dec 2014 09:20:08 -0500 Received: from mga11.intel.com ([192.55.52.93]:50567 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751816AbaL3OUH (ORCPT ); Tue, 30 Dec 2014 09:20:07 -0500 Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga102.fm.intel.com with ESMTP; 30 Dec 2014 06:20:07 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.07,666,1413270000"; d="scan'208";a="644558903" Received: from egrumbacbox.jer.intel.com ([10.12.126.105]) by fmsmga001.fm.intel.com with ESMTP; 30 Dec 2014 06:20:03 -0800 From: Emmanuel Grumbach To: linux-wireless@vger.kernel.org Cc: Eliad Peller , Eliad Peller , Emmanuel Grumbach Subject: [PATCH 20/33] iwlwifi: mvm: wait for d0i3 exit on hw restart Date: Tue, 30 Dec 2014 16:18:55 +0200 Message-Id: <1419949148-24046-20-git-send-email-emmanuel.grumbach@intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1419948357.21410.4.camel@egrumbacBox> References: <1419948357.21410.4.camel@egrumbacBox> Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Eliad Peller On hw restart, make sure to wait for d0i3 exit (by checking the IN_D0I3 status bit). This is needed in order to avoid the stale d0i3_exit_work from doing harm (e.g. unref cleared reference). Signed-off-by: Eliad Peller Reviewed-by: Gregory Greenman Reviewed-by: Johannes Berg Signed-off-by: Emmanuel Grumbach --- drivers/net/wireless/iwlwifi/mvm/mac80211.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/drivers/net/wireless/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/iwlwifi/mvm/mac80211.c index 29f0feb..9ccecbc 100644 --- a/drivers/net/wireless/iwlwifi/mvm/mac80211.c +++ b/drivers/net/wireless/iwlwifi/mvm/mac80211.c @@ -972,6 +972,19 @@ static int iwl_mvm_mac_start(struct ieee80211_hw *hw) struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw); int ret; + /* Some hw restart cleanups must not hold the mutex */ + if (test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status)) { + /* + * Make sure we are out of d0i3. This is needed + * to make sure the reference accounting is correct + * (and there is no stale d0i3_exit_work). + */ + wait_event_timeout(mvm->d0i3_exit_waitq, + !test_bit(IWL_MVM_STATUS_IN_D0I3, + &mvm->status), + HZ); + } + mutex_lock(&mvm->mutex); ret = __iwl_mvm_mac_start(mvm); mutex_unlock(&mvm->mutex);