From patchwork Wed Jul 20 22:25:38 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Wang X-Patchwork-Id: 592100 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A9691C433EF for ; Wed, 20 Jul 2022 22:25:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230385AbiGTWZ5 (ORCPT ); Wed, 20 Jul 2022 18:25:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58366 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229449AbiGTWZ5 (ORCPT ); Wed, 20 Jul 2022 18:25:57 -0400 Received: from mailgw02.mediatek.com (unknown [210.61.82.184]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E172D5F5B for ; Wed, 20 Jul 2022 15:25:49 -0700 (PDT) X-UUID: 7303a5cbfcee482ebc19e8e599b5ae40-20220721 X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.8, REQID:32d62e1f-1f76-4e4c-a03b-6bba437f19f6, OB:20, L OB:0,IP:0,URL:5,TC:0,Content:0,EDM:0,RT:0,SF:95,FILE:0,RULE:Release_Ham,AC TION:release,TS:100 X-CID-INFO: VERSION:1.1.8, REQID:32d62e1f-1f76-4e4c-a03b-6bba437f19f6, OB:20, LOB :0,IP:0,URL:5,TC:0,Content:0,EDM:0,RT:0,SF:95,FILE:0,RULE:Spam_GS981B3D,AC TION:quarantine,TS:100 X-CID-META: VersionHash:0f94e32, CLOUDID:5a9f06d8-5d6d-4eaf-a635-828a3ee48b7c, C OID:dfdc1513ed4c,Recheck:0,SF:28|17|19|48,TC:nil,Content:0,EDM:-3,IP:nil,U RL:1,File:nil,QS:nil,BEC:nil,COL:0 X-UUID: 7303a5cbfcee482ebc19e8e599b5ae40-20220721 Received: from mtkcas11.mediatek.inc [(172.21.101.40)] by mailgw02.mediatek.com (envelope-from ) (Generic MTA with TLSv1.2 ECDHE-RSA-AES256-SHA384 256/256) with ESMTP id 1451868277; Thu, 21 Jul 2022 06:25:43 +0800 Received: from mtkmbs11n1.mediatek.inc (172.21.101.185) by mtkmbs11n1.mediatek.inc (172.21.101.185) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.792.3; Thu, 21 Jul 2022 06:25:41 +0800 Received: from mtkswgap22.mediatek.inc (172.21.77.33) by mtkmbs11n1.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.792.3 via Frontend Transport; Thu, 21 Jul 2022 06:25:41 +0800 From: To: , CC: , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v2 2/4] mt76: mt7921s: fix race issue between reset and suspend/resume Date: Thu, 21 Jul 2022 06:25:38 +0800 Message-ID: <0a8e8ed3b179da75d4e141e0384992864e36b33a.1658355599.git.sean.wang@kernel.org> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <5f835553ee8b76e4a4ed83f9562eaa0b1a24c1e6.1658355599.git.sean.wang@kernel.org> References: <5f835553ee8b76e4a4ed83f9562eaa0b1a24c1e6.1658355599.git.sean.wang@kernel.org> MIME-Version: 1.0 X-MTK: N Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Sean Wang It is unexpected that the reset work is running simultaneously with the suspend or resume context and it is possible that reset work is still running even after mt7921 is suspended if we don't fix the race issue. Thus, the suspend procedure should be waiting until the reset is completed at the beginning and ignore the subsequent the reset requests. In case there is an error that happens during either suspend or resume handler, we will schedule a reset task to recover the error before returning the error code to ensure we can immediately fix the error there. Fixes: ca74b9b907f9 ("mt76: mt7921s: add reset support") Co-developed-by: YN Chen Signed-off-by: YN Chen Signed-off-by: Sean Wang --- v2: use flush_work instead of cancel_work_sync --- drivers/net/wireless/mediatek/mt76/mt7921/sdio.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/sdio.c b/drivers/net/wireless/mediatek/mt76/mt7921/sdio.c index 487acd6e2be8..2face849fb4f 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7921/sdio.c +++ b/drivers/net/wireless/mediatek/mt76/mt7921/sdio.c @@ -206,6 +206,7 @@ static int mt7921s_suspend(struct device *__dev) pm->suspended = true; set_bit(MT76_STATE_SUSPEND, &mdev->phy.state); + flush_work(&dev->reset_work); cancel_delayed_work_sync(&pm->ps_work); cancel_work_sync(&pm->wake_work); @@ -261,6 +262,9 @@ static int mt7921s_suspend(struct device *__dev) clear_bit(MT76_STATE_SUSPEND, &mdev->phy.state); pm->suspended = false; + if (err < 0) + mt7921_reset(&dev->mt76); + return err; } @@ -276,7 +280,7 @@ static int mt7921s_resume(struct device *__dev) err = mt7921_mcu_drv_pmctrl(dev); if (err < 0) - return err; + goto failed; mt76_worker_enable(&mdev->tx_worker); mt76_worker_enable(&mdev->sdio.txrx_worker); @@ -288,11 +292,12 @@ static int mt7921s_resume(struct device *__dev) mt76_connac_mcu_set_deep_sleep(mdev, false); err = mt76_connac_mcu_set_hif_suspend(mdev, false); - if (err) - return err; - +failed: pm->suspended = false; + if (err < 0) + mt7921_reset(&dev->mt76); + return err; }