From patchwork Wed Jul 20 22:25:39 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Wang X-Patchwork-Id: 12924545 X-Patchwork-Delegate: nbd@nbd.name 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 EB422CCA483 for ; Wed, 20 Jul 2022 22:26:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230440AbiGTWZ7 (ORCPT ); Wed, 20 Jul 2022 18:25:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58376 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229449AbiGTWZ6 (ORCPT ); Wed, 20 Jul 2022 18:25:58 -0400 Received: from mailgw02.mediatek.com (unknown [210.61.82.184]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id ABD5D55B6 for ; Wed, 20 Jul 2022 15:25:51 -0700 (PDT) X-UUID: 644307b5d3ab4422a7d1bcd47ab8712e-20220721 X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.8,REQID:1bbe364b-8c76-4435-bbdd-1c4a301cad63,OB:30,L OB:10,IP:0,URL:5,TC:0,Content:-5,EDM:0,RT:0,SF:95,FILE:0,RULE:Release_Ham, ACTION:release,TS:95 X-CID-INFO: VERSION:1.1.8,REQID:1bbe364b-8c76-4435-bbdd-1c4a301cad63,OB:30,LOB :10,IP:0,URL:5,TC:0,Content:-5,EDM:0,RT:0,SF:95,FILE:0,RULE:Spam_GS981B3D, ACTION:quarantine,TS:95 X-CID-META: VersionHash:0f94e32,CLOUDID:5b9f06d8-5d6d-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: 644307b5d3ab4422a7d1bcd47ab8712e-20220721 Received: from mtkcas10.mediatek.inc [(172.21.101.39)] by mailgw02.mediatek.com (envelope-from ) (Generic MTA with TLSv1.2 ECDHE-RSA-AES256-SHA384 256/256) with ESMTP id 802798640; Thu, 21 Jul 2022 06:25:42 +0800 Received: from mtkmbs11n1.mediatek.inc (172.21.101.185) by mtkmbs10n2.mediatek.inc (172.21.101.183) 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 06:25:42 +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 3/4] mt76: mt7921u: fix race issue between reset and suspend/resume Date: Thu, 21 Jul 2022 06:25:39 +0800 Message-ID: <983945d762b95c0259cc8d7702e5e25fffcc0ef0.1658355599.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: df3e4143ba8a ("mt76: mt7921u: add suspend/resume 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 --- .../net/wireless/mediatek/mt76/mt7921/usb.c | 28 ++++++++++++++++--- 1 file changed, 24 insertions(+), 4 deletions(-) diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/usb.c b/drivers/net/wireless/mediatek/mt76/mt7921/usb.c index dd3b8884e162..613d5cefffc7 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7921/usb.c +++ b/drivers/net/wireless/mediatek/mt76/mt7921/usb.c @@ -300,11 +300,15 @@ static void mt7921u_disconnect(struct usb_interface *usb_intf) static int mt7921u_suspend(struct usb_interface *intf, pm_message_t state) { struct mt7921_dev *dev = usb_get_intfdata(intf); + struct mt76_connac_pm *pm = &dev->pm; int err; + pm->suspended = true; + flush_work(&dev->reset_work); + err = mt76_connac_mcu_set_hif_suspend(&dev->mt76, true); if (err) - return err; + goto failed; mt76u_stop_rx(&dev->mt76); mt76u_stop_tx(&dev->mt76); @@ -312,11 +316,20 @@ static int mt7921u_suspend(struct usb_interface *intf, pm_message_t state) set_bit(MT76_STATE_SUSPEND, &dev->mphy.state); return 0; + +failed: + pm->suspended = false; + + if (err < 0) + mt7921_reset(&dev->mt76); + + return err; } static int mt7921u_resume(struct usb_interface *intf) { struct mt7921_dev *dev = usb_get_intfdata(intf); + struct mt76_connac_pm *pm = &dev->pm; bool reinit = true; int err, i; @@ -338,16 +351,23 @@ static int mt7921u_resume(struct usb_interface *intf) if (reinit || mt7921_dma_need_reinit(dev)) { err = mt7921u_dma_init(dev, true); if (err) - return err; + goto failed; } clear_bit(MT76_STATE_SUSPEND, &dev->mphy.state); err = mt76u_resume_rx(&dev->mt76); if (err < 0) - return err; + goto failed; + + err = mt76_connac_mcu_set_hif_suspend(&dev->mt76, false); +failed: + pm->suspended = false; + + if (err < 0) + mt7921_reset(&dev->mt76); - return mt76_connac_mcu_set_hif_suspend(&dev->mt76, false); + return err; } #endif /* CONFIG_PM */