From patchwork Wed Dec 7 14:04:55 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lorenzo Bianconi X-Patchwork-Id: 13067204 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 A64A7C352A1 for ; Wed, 7 Dec 2022 14:05:53 +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-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=Gi/s8C1eEMs6of3JA85kDoSQTJ/ep+T3e352nQtWXoA=; b=l8hKG/A4ihh/CWp5fbk2JnPhUT JnfLMGrpvshEYC47PIYdRycXwVFnTZNxpUtsOutHvxwRX1UilLogIDZqHcAmjTTaIDdxbdUX8Nd8y kCf7arARxiBhPcS6tRJZ/QhA5chsmNv/4r6JSROmU6tA25EGe/xJTQhydrh2dUNJq6wm4oDJdGQXz 4wQtu7XRZiRNcW1+KUf8Zvp+zId7ovxQsrmCxemPWfYjJFhHcomfr2bnn9XU8duhP5Mqk8+RKxsvD pbRe0lJ+chR1GAbze7DXO/+kAr4anoBDmLDgOCx0ohB09JOxDvxiPuZB1HdMZ2qddFv0c/0a8ZM3+ idEQwRjA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1p2v3Q-004SeM-Mm; Wed, 07 Dec 2022 14:05:44 +0000 Received: from ams.source.kernel.org ([145.40.68.75]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1p2v3N-004SWh-5G for linux-mediatek@lists.infradead.org; Wed, 07 Dec 2022 14:05:44 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 74B43B81DF4; Wed, 7 Dec 2022 14:05:39 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id DA3ABC433C1; Wed, 7 Dec 2022 14:05:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1670421938; bh=sRaak4KLeCok7dS29659RMJxhIRUiWs94IOmcA+/uIE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CqQ7bQNh5/D/kXndvbEeFCOeu36ZFkIWH3EF5Tj8kSR8+zqgDsz2RX004OgTgOZ7E 6n7yvTBECDl3wGu1SH28FQJEC1IlZXOSGHasY3hLSzHI1aSHPFScQuAuu6LUI7gEw4 KT/9Gm4WkxGAtTCMCm0TT/ZTDLft7UUJpZG79L+qX5i3HSUQLrpcaqmCA7cWPj1mt0 yM4ce/VtFomWtZg5oO/QDPo5p6vsinnHHGrAqYCia8AuHG4GQkdhST1O23em/tXiXg 1OU+mSv2ORwiV01Hj5N8zlppIPnLjG+pXYUi9CS+8SgBDuihtng30dakx1siWpwL5h iUqFVcdVmnGHQ== From: Lorenzo Bianconi To: netdev@vger.kernel.org Cc: nbd@nbd.name, john@phrozen.org, sean.wang@mediatek.com, Mark-MC.Lee@mediatek.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, matthias.bgg@gmail.com, linux-mediatek@lists.infradead.org, lorenzo.bianconi@redhat.com, leon@kernel.org, sujuan.chen@mediatek.com Subject: [PATCH v3 net-next 2/2] net: ethernet: mtk_wed: fix possible deadlock if mtk_wed_wo_init fails Date: Wed, 7 Dec 2022 15:04:55 +0100 Message-Id: X-Mailer: git-send-email 2.38.1 In-Reply-To: References: MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221207_060541_432872_A5553991 X-CRM114-Status: GOOD ( 10.34 ) 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 Introduce __mtk_wed_detach() in order to avoid a deadlock in mtk_wed_attach routine if mtk_wed_wo_init fails since both mtk_wed_attach and mtk_wed_detach run holding hw_lock mutex. Fixes: 4c5de09eb0d0 ("net: ethernet: mtk_wed: add configure wed wo support") Signed-off-by: Lorenzo Bianconi Reviewed-by: Leon Romanovsky --- drivers/net/ethernet/mediatek/mtk_wed.c | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) diff --git a/drivers/net/ethernet/mediatek/mtk_wed.c b/drivers/net/ethernet/mediatek/mtk_wed.c index 4ef23eadd69e..a6271449617f 100644 --- a/drivers/net/ethernet/mediatek/mtk_wed.c +++ b/drivers/net/ethernet/mediatek/mtk_wed.c @@ -577,12 +577,10 @@ mtk_wed_deinit(struct mtk_wed_device *dev) } static void -mtk_wed_detach(struct mtk_wed_device *dev) +__mtk_wed_detach(struct mtk_wed_device *dev) { struct mtk_wed_hw *hw = dev->hw; - mutex_lock(&hw_lock); - mtk_wed_deinit(dev); mtk_wdma_rx_reset(dev); @@ -615,6 +613,13 @@ mtk_wed_detach(struct mtk_wed_device *dev) module_put(THIS_MODULE); hw->wed_dev = NULL; +} + +static void +mtk_wed_detach(struct mtk_wed_device *dev) +{ + mutex_lock(&hw_lock); + __mtk_wed_detach(dev); mutex_unlock(&hw_lock); } @@ -1497,8 +1502,10 @@ mtk_wed_attach(struct mtk_wed_device *dev) ret = mtk_wed_wo_init(hw); } out: - if (ret) - mtk_wed_detach(dev); + if (ret) { + dev_err(dev->hw->dev, "failed to attach wed device\n"); + __mtk_wed_detach(dev); + } unlock: mutex_unlock(&hw_lock);