From patchwork Sun Jan 15 04:44:57 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Deren Wu X-Patchwork-Id: 13102150 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 8BE90C3DA78 for ; Sun, 15 Jan 2023 04:45:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230432AbjAOEp5 (ORCPT ); Sat, 14 Jan 2023 23:45:57 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44756 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230441AbjAOEpz (ORCPT ); Sat, 14 Jan 2023 23:45:55 -0500 Received: from mailgw02.mediatek.com (unknown [210.61.82.184]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3CF1E83E6 for ; Sat, 14 Jan 2023 20:45:46 -0800 (PST) X-UUID: 7576e534948f11ed945fc101203acc17-20230115 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=SE+ZkPRpNyah5KFkFmlvFD5P/yDO5NWK+lh8uAHJDSE=; b=b17A/ZgRhwqPCycbmRszwSYXLb3Q5DTZZ5Hb3gcIgySCA2qY5kSl3mZ8Q4PLmUqhiHFopUppm7NxVoOWquW8fmAHlusIIIFrU71VtnE9IMU0uehW8YLfz9JgMbgYIeofuAb4zCviqpwbCzNQDHFYjQCrbZCzLqvMXnB6sfU4VQg=; X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.17,REQID:f7e07952-779e-406d-a47e-ce30ef83b55f,IP:0,U RL:0,TC:0,Content:0,EDM:0,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTION: release,TS:0 X-CID-META: VersionHash:543e81c,CLOUDID:da73458c-8530-4eff-9f77-222cf6e2895b,B ulkID:nil,BulkQuantity:0,Recheck:0,SF:102,TC:nil,Content:0,EDM:-3,IP:nil,U RL:0,File:nil,Bulk:nil,QS:nil,BEC:nil,COL:0,OSI:0,OSA:0 X-CID-BVR: 0 X-UUID: 7576e534948f11ed945fc101203acc17-20230115 Received: from mtkmbs10n2.mediatek.inc [(172.21.101.183)] by mailgw02.mediatek.com (envelope-from ) (Generic MTA with TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384 256/256) with ESMTP id 1157367514; Sun, 15 Jan 2023 12:45:39 +0800 Received: from mtkmbs13n1.mediatek.inc (172.21.101.193) by mtkmbs13n2.mediatek.inc (172.21.101.108) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.792.15; Sun, 15 Jan 2023 12:45:37 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkmbs13n1.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.792.15 via Frontend Transport; Sun, 15 Jan 2023 12:45:37 +0800 From: Deren Wu To: Felix Fietkau , Lorenzo Bianconi CC: Sean Wang , Soul Huang , YN Chen , Leon Yen , Eric-SY Chang , Deren Wu , KM Lin , Robin Chiu , CH Yeh , Posh Sun , Stella Chang , Evelyn Tsai , Ryder Lee , Shayne Chen , linux-wireless , linux-mediatek , Deren Wu Subject: [PATCH] wifi: mt76: add memory barrier to SDIO queue kick Date: Sun, 15 Jan 2023 12:44:57 +0800 Message-ID: <2489b17e8249ef8db840edb6168888ff5c887a6b.1673754074.git.deren.wu@mediatek.com> X-Mailer: git-send-email 2.18.0 MIME-Version: 1.0 X-MTK: N Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org Ensure the entry has been fully updated before SDIO bus worker access it. This patch would fix potential memory risk in both mt7663s and mt7921s. Fixes: 764dee47e2c1 ("mt76: sdio: move common code in mt76_sdio module") Signed-off-by: Deren Wu Reviewed-by: AngeloGioacchino Del Regno --- drivers/net/wireless/mediatek/mt76/sdio.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/net/wireless/mediatek/mt76/sdio.c b/drivers/net/wireless/mediatek/mt76/sdio.c index 228bc7d45011..419723118ded 100644 --- a/drivers/net/wireless/mediatek/mt76/sdio.c +++ b/drivers/net/wireless/mediatek/mt76/sdio.c @@ -562,6 +562,10 @@ mt76s_tx_queue_skb_raw(struct mt76_dev *dev, struct mt76_queue *q, q->entry[q->head].buf_sz = len; q->entry[q->head].skb = skb; + + /* ensure the entry fully updated before bus access */ + smp_wmb(); + q->head = (q->head + 1) % q->ndesc; q->queued++;