From patchwork Wed Jul 20 22:25:37 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Wang X-Patchwork-Id: 12924548 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 355F6C43334 for ; Wed, 20 Jul 2022 22:36:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Type:MIME-Version: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-Transfer-Encoding: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=5cWbfCLir+nWd69+kcxFSIfKlSJmDzAyzHBfaCvYP30=; b=P58Ka05LSoHtDrABES0PHc1EIQ 7C+KwERORlJ4+tTjw7nSbBkBjn47OaJt+ezVH4uPMQk2FN+I78U0jvtqs7onc30WoydF2Fqdn6fB7 8r33S66EdEH2rLKgfDcNXmvsOuWAvbaiBgIWyMX8rD93qlxlEewZPMzxkHXzqFZ4vxXb66cE93i1/ 7DL++8vzQ3dehfLYZty42Jv65/U6DlTbiKkOjLseEWkbqGhK2paVdZYhmACh3KKjD2WG6/l0JWxBA urbLDteU3x7I1eNxJOWtH58Gw1TQbM0WltBzkTDmvuPzeb5XUw18wiEyW+ecd3RAG6sbWJUfEQDtU U2HNxt4A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1oEIIp-00CW2f-7v; Wed, 20 Jul 2022 22:36:23 +0000 Received: from mailgw02.mediatek.com ([216.200.240.185]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1oEIIm-00CW1v-Qm for linux-mediatek@lists.infradead.org; Wed, 20 Jul 2022 22:36:22 +0000 X-UUID: 630dc174e8d7475faf6002cfeea96f17-20220720 X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.8,REQID:adda1feb-2147-42d5-a945-d448ea9ac793,OB:0,LO B:0,IP:0,URL:5,TC:0,Content:0,EDM:0,RT:0,SF:0,FILE:0,RULE:Release_Ham,ACTI ON:release,TS:5 X-CID-META: VersionHash:0f94e32,CLOUDID:f4308433-b9e4-42b8-b28a-6364427c76bb,C OID:IGNORED,Recheck:0,SF:nil,TC:nil,Content:0,EDM:-3,IP:nil,URL:1,File:nil ,QS:nil,BEC:nil,COL:0 X-UUID: 630dc174e8d7475faf6002cfeea96f17-20220720 Received: from mtkmbs11n1.mediatek.inc [(172.21.101.185)] by mailgw02.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384 256/256) with ESMTP id 393331902; Wed, 20 Jul 2022 15:36:16 -0700 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 06:25:41 +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 1/4] mt76: mt7921e: fix race issue between reset and suspend/resume Date: Thu, 21 Jul 2022 06:25:37 +0800 Message-ID: <5f835553ee8b76e4a4ed83f9562eaa0b1a24c1e6.1658355599.git.sean.wang@kernel.org> X-Mailer: git-send-email 1.7.9.5 MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220720_153620_919581_CCE4E290 X-CRM114-Status: GOOD ( 16.84 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.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: 0c1ce9884607 ("mt76: mt7921: add wifi 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/mac.c | 5 +++++ drivers/net/wireless/mediatek/mt76/mt7921/pci.c | 13 +++++++++---- 2 files changed, 14 insertions(+), 4 deletions(-) diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/mac.c b/drivers/net/wireless/mediatek/mt76/mt7921/mac.c index 47f0aa81ab02..6bd9fc9228a2 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7921/mac.c +++ b/drivers/net/wireless/mediatek/mt76/mt7921/mac.c @@ -780,6 +780,7 @@ void mt7921_mac_reset_work(struct work_struct *work) void mt7921_reset(struct mt76_dev *mdev) { struct mt7921_dev *dev = container_of(mdev, struct mt7921_dev, mt76); + struct mt76_connac_pm *pm = &dev->pm; if (!dev->hw_init_done) return; @@ -787,8 +788,12 @@ void mt7921_reset(struct mt76_dev *mdev) if (dev->hw_full_reset) return; + if (pm->suspended) + return; + queue_work(dev->mt76.wq, &dev->reset_work); } +EXPORT_SYMBOL_GPL(mt7921_reset); void mt7921_mac_update_mib_stats(struct mt7921_phy *phy) { diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c index 9d1ba838e54f..a88561a4e903 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c +++ b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c @@ -363,6 +363,7 @@ static int mt7921_pci_suspend(struct device *device) int i, err; pm->suspended = true; + flush_work(&dev->reset_work); cancel_delayed_work_sync(&pm->ps_work); cancel_work_sync(&pm->wake_work); @@ -424,6 +425,9 @@ static int mt7921_pci_suspend(struct device *device) restore_suspend: pm->suspended = false; + if (err < 0) + mt7921_reset(&dev->mt76); + return err; } @@ -437,7 +441,7 @@ static int mt7921_pci_resume(struct device *device) err = mt7921_mcu_drv_pmctrl(dev); if (err < 0) - return err; + goto failed; mt7921_wpdma_reinit_cond(dev); @@ -467,11 +471,12 @@ static int mt7921_pci_resume(struct device *device) mt76_connac_mcu_set_deep_sleep(&dev->mt76, 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; }