From patchwork Thu Sep 15 05:32:35 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Wang X-Patchwork-Id: 12976817 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 EFBB6ECAAA1 for ; Thu, 15 Sep 2022 05:32:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229729AbiIOFcq (ORCPT ); Thu, 15 Sep 2022 01:32:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57568 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229552AbiIOFcp (ORCPT ); Thu, 15 Sep 2022 01:32:45 -0400 Received: from mailgw02.mediatek.com (unknown [210.61.82.184]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D859B77577; Wed, 14 Sep 2022 22:32:43 -0700 (PDT) X-UUID: 9e0e5349c19f4b78a83b8417397e9ed2-20220915 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Type:MIME-Version:Message-ID:Date:Subject:CC:To:From; bh=YkxDDvQTqV0T2kgqiwptXOrxnydc9XfbPvm55Lt05Q0=; b=ASFl1ntJ19L2r1GeyWqCH/VEpjcJpSPBKqPPaMRwYPiRL3eKRJlxPLF2e41v1FNjxQ6lxOVQIckNw7XGgFPqgDAO90OSjRfOPZvkbymD3e8vOeeJvA+EU/bC/wQGK8VmTHWZzeQdYKm04Po82lzf4nLjpELDp1iFNsew7dXH1ZI=; X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.11,REQID:2b039e25-fdbd-4096-936c-9f185c2a0048,IP:0,U RL:0,TC:0,Content:-25,EDM:0,RT:0,SF:95,FILE:0,BULK:0,RULE:Release_Ham,ACTI ON:release,TS:70 X-CID-INFO: VERSION:1.1.11,REQID:2b039e25-fdbd-4096-936c-9f185c2a0048,IP:0,URL :0,TC:0,Content:-25,EDM:0,RT:0,SF:95,FILE:0,BULK:0,RULE:Spam_GS981B3D,ACTI ON:quarantine,TS:70 X-CID-META: VersionHash:39a5ff1,CLOUDID:9fb4b85d-5ed4-4e28-8b00-66ed9f042fbd,B ulkID:2209151332395LCBLUT0,BulkQuantity:0,Recheck:0,SF:28|17|19|48,TC:nil, Content:0,EDM:-3,IP:nil,URL:1,File:nil,Bulk:nil,QS:nil,BEC:nil,COL:0 X-UUID: 9e0e5349c19f4b78a83b8417397e9ed2-20220915 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 751581607; Thu, 15 Sep 2022 13:32:37 +0800 Received: from mtkcas11.mediatek.inc (172.21.101.40) by mtkmbs10n1.mediatek.inc (172.21.101.34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.2.792.15; Thu, 15 Sep 2022 13:32:37 +0800 Received: from mtkswgap22.mediatek.inc (172.21.77.33) by mtkcas11.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Thu, 15 Sep 2022 13:32:36 +0800 From: To: CC: , , , Deren Wu , "Johannes Berg" Subject: [PATCH 5.19] wifi: mt76: mt7921e: fix crash in chip reset fail Date: Thu, 15 Sep 2022 13:32:35 +0800 Message-ID: <404d2f5ec663128342541fa392a47226a46e5634.1663219530.git.objelf@gmail.com> X-Mailer: git-send-email 1.7.9.5 MIME-Version: 1.0 X-MTK: N Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Deren Wu commit fa3fbe64037839f448dc569212bafc5a495d8219 upstream. In case of drv own fail in reset, we may need to run mac_reset several times. The sequence would trigger system crash as the log below. Because we do not re-enable/schedule "tx_napi" before disable it again, the process would keep waiting for state change in napi_diable(). To avoid the problem and keep status synchronize for each run, goto final resource handling if drv own failed. [ 5857.353423] mt7921e 0000:3b:00.0: driver own failed [ 5858.433427] mt7921e 0000:3b:00.0: Timeout for driver own [ 5859.633430] mt7921e 0000:3b:00.0: driver own failed [ 5859.633444] ------------[ cut here ]------------ [ 5859.633446] WARNING: CPU: 6 at kernel/kthread.c:659 kthread_park+0x11d [ 5859.633717] Workqueue: mt76 mt7921_mac_reset_work [mt7921_common] [ 5859.633728] RIP: 0010:kthread_park+0x11d/0x150 [ 5859.633736] RSP: 0018:ffff8881b676fc68 EFLAGS: 00010202 ...... [ 5859.633766] Call Trace: [ 5859.633768] [ 5859.633771] mt7921e_mac_reset+0x176/0x6f0 [mt7921e] [ 5859.633778] mt7921_mac_reset_work+0x184/0x3a0 [mt7921_common] [ 5859.633785] ? mt7921_mac_set_timing+0x520/0x520 [mt7921_common] [ 5859.633794] ? __kasan_check_read+0x11/0x20 [ 5859.633802] process_one_work+0x7ee/0x1320 [ 5859.633810] worker_thread+0x53c/0x1240 [ 5859.633818] kthread+0x2b8/0x370 [ 5859.633824] ? process_one_work+0x1320/0x1320 [ 5859.633828] ? kthread_complete_and_exit+0x30/0x30 [ 5859.633834] ret_from_fork+0x1f/0x30 [ 5859.633842] Cc: stable@vger.kernel.org Fixes: 0efaf31dec57 ("mt76: mt7921: fix MT7921E reset failure") Signed-off-by: Deren Wu Link: https://lore.kernel.org/r/727eb5ffd3c7c805245e512da150ecf0a7154020.1659452909.git.deren.wu@mediatek.com Signed-off-by: Johannes Berg --- drivers/net/wireless/mediatek/mt76/mt7921/pci_mac.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/pci_mac.c b/drivers/net/wireless/mediatek/mt76/mt7921/pci_mac.c index b0f58bcf70cb..106c88b723b9 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7921/pci_mac.c +++ b/drivers/net/wireless/mediatek/mt76/mt7921/pci_mac.c @@ -345,7 +345,7 @@ int mt7921e_mac_reset(struct mt7921_dev *dev) err = mt7921e_driver_own(dev); if (err) - return err; + goto out; err = mt7921_run_firmware(dev); if (err)