From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5F2CDC43461 for ; Wed, 12 May 2021 16:27:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2CAE961376 for ; Wed, 12 May 2021 16:27:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241067AbhELQ0S (ORCPT ); Wed, 12 May 2021 12:26:18 -0400 Received: from mail.kernel.org ([198.145.29.99]:55166 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236386AbhELPhu (ORCPT ); Wed, 12 May 2021 11:37:50 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 1AA8C61993; Wed, 12 May 2021 15:19:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1620832773; bh=CGO2sFoVdylIdaV4vRLZrGCCDcNNIkPwS96faCCOph0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=SN8JIeQyNsT79ls6FMGTYKsh1a9IxxXHmvn0+wuqjcyLCw7APsIEjAXgRe1t2+/mw JskrslORQu5uovu9DfjFdCDb7kovTpI8Stw45uCrBKupfnOqOFXqcsxHJZoauKE0z4 9/XNLXjuDqiWHrteVEJ053h9zrGYA02st+1nWJ9E= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Sean Wang , Felix Fietkau , Sasha Levin Subject: [PATCH 5.10 418/530] mt76: mt7663s: fix the possible device hang in high traffic Date: Wed, 12 May 2021 16:48:48 +0200 Message-Id: <20210512144833.505772490@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210512144819.664462530@linuxfoundation.org> References: <20210512144819.664462530@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Sean Wang [ Upstream commit 45247a85614b49b07b9dc59a4e6783b17e766ff2 ] Use the additional memory barrier to ensure the skb list up-to-date between the skb producer and consumer to avoid the invalid skb content written into sdio controller and then cause device hang due to mcu assert caught by WR_TIMEOUT_INT. Fixes: 1522ff731f84 ("mt76: mt7663s: introduce sdio tx aggregation") Signed-off-by: Sean Wang Signed-off-by: Felix Fietkau Signed-off-by: Sasha Levin --- drivers/net/wireless/mediatek/mt76/mt7615/sdio_txrx.c | 2 ++ drivers/net/wireless/mediatek/mt76/sdio.c | 3 +++ 2 files changed, 5 insertions(+) diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/sdio_txrx.c b/drivers/net/wireless/mediatek/mt76/mt7615/sdio_txrx.c index 2c269fee8555..d7d61a5b66a3 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7615/sdio_txrx.c +++ b/drivers/net/wireless/mediatek/mt76/mt7615/sdio_txrx.c @@ -201,6 +201,8 @@ static int mt7663s_tx_run_queue(struct mt76_dev *dev, enum mt76_txq_id qid) struct mt76_queue_entry *e = &q->entry[q->first]; struct sk_buff *iter; + smp_rmb(); + if (!test_bit(MT76_STATE_MCU_RUNNING, &dev->phy.state)) { __skb_put_zero(e->skb, 4); err = __mt7663s_xmit_queue(dev, e->skb->data, diff --git a/drivers/net/wireless/mediatek/mt76/sdio.c b/drivers/net/wireless/mediatek/mt76/sdio.c index 9a4d95a2a707..439ea4158260 100644 --- a/drivers/net/wireless/mediatek/mt76/sdio.c +++ b/drivers/net/wireless/mediatek/mt76/sdio.c @@ -215,6 +215,9 @@ mt76s_tx_queue_skb(struct mt76_dev *dev, enum mt76_txq_id qid, q->entry[q->head].skb = tx_info.skb; q->entry[q->head].buf_sz = len; + + smp_wmb(); + q->head = (q->head + 1) % q->ndesc; q->queued++; -- 2.30.2