From nobody Mon Oct 6 13:58:08 2025 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by smtp.subspace.kernel.org (Postfix) with ESMTP id A731E28AAE0; Tue, 22 Jul 2025 06:27:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=114.242.206.163 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753165648; cv=none; b=TTqk1iZbM1t1PKrHwnxcvlbafEioiQydbz38aN2a/hQ3faDOg51F3ppUjSg5qG21HoeiGXYjSlM7xzKZro1GJdUgPrA9MHi2w7zVk0xiJuezfV9PIhuy08K3qaw5lhw3jRAZHlWfMSC+waSPFkvjNJA1pF9SnJWrzudWfxNusp4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753165648; c=relaxed/simple; bh=2983MGwCmTrhiCMmjo7ivMO1IqUzAw2fc+EtY+FKFwI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Gr7ZbHK8qbPB9ZedYu13UdEt4fY0hmXNWcZiQX8ecHc6GWzQCZRgIAjzNN0MtxGrv+9wXqn6rDcn9Nm4CxFFKyRwDIdqe75vX49XWCYHEJVEvtB7kKwlwrMLnAfFufA608s3Gm+eftQwooiFT+FvrWNttl7BqA+n6sHhq9XFKWY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=loongson.cn; spf=pass smtp.mailfrom=loongson.cn; arc=none smtp.client-ip=114.242.206.163 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=loongson.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=loongson.cn Received: from loongson.cn (unknown [113.200.148.30]) by gateway (Coremail) with SMTP id _____8DxjXJJL39oD2gvAQ--.31070S3; Tue, 22 Jul 2025 14:27:21 +0800 (CST) Received: from linux.localdomain (unknown [113.200.148.30]) by front1 (Coremail) with SMTP id qMiowJAxvsFFL39oIIchAA--.2200S3; Tue, 22 Jul 2025 14:27:19 +0800 (CST) From: Tiezhu Yang To: Andrew Lunn , "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH net-next 1/2] net: stmmac: Return early if invalid in loongson_dwmac_fix_reset() Date: Tue, 22 Jul 2025 14:27:15 +0800 Message-ID: <20250722062716.29590-2-yangtiezhu@loongson.cn> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20250722062716.29590-1-yangtiezhu@loongson.cn> References: <20250722062716.29590-1-yangtiezhu@loongson.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: qMiowJAxvsFFL39oIIchAA--.2200S3 X-CM-SenderInfo: p1dqw3xlh2x3gn0dqz5rrqw2lrqou0/ X-Coremail-Antispam: 1Uk129KBj9xXoWruFW7uryxCw4xWw1xJr4kKrX_yoWDJFb_WF 1SvFnYqFn8Xr45t347tw13ZrySvFykWa1ruanrt3yS93y2vwn8JF9Y9rZ5GFnxCrykZF98 Gr1ftr4Ivw18tosvyTuYvTs0mTUanT9S1TB71UUUUj7qnTZGkaVYY2UrUUUUj1kv1TuYvT s0mT0YCTnIWjqI5I8CrVACY4xI64kE6c02F40Ex7xfYxn0WfASr-VFAUDa7-sFnT9fnUUI cSsGvfJTRUUUbS8YFVCjjxCrM7AC8VAFwI0_Jr0_Gr1l1xkIjI8I6I8E6xAIw20EY4v20x vaj40_Wr0E3s1l1IIY67AEw4v_Jrv_JF1l8cAvFVAK0II2c7xJM28CjxkF64kEwVA0rcxS w2x7M28EF7xvwVC0I7IYx2IY67AKxVW8JVW5JwA2z4x0Y4vE2Ix0cI8IcVCY1x0267AKxV W8JVWxJwA2z4x0Y4vEx4A2jsIE14v26r4UJVWxJr1l84ACjcxK6I8E87Iv6xkF7I0E14v2 6F4UJVW0owAaw2AFwI0_JF0_Jw1le2I262IYc4CY6c8Ij28IcVAaY2xG8wAqjxCEc2xF0c Ia020Ex4CE44I27wAqx4xG64xvF2IEw4CE5I8CrVC2j2WlYx0E2Ix0cI8IcVAFwI0_Jw0_ WrylYx0Ex4A2jsIE14v26r4j6F4UMcvjeVCFs4IE7xkEbVWUJVW8JwACjcxG0xvY0x0EwI xGrwCY1x0262kKe7AKxVWUAVWUtwCF04k20xvY0x0EwIxGrwCFx2IqxVCFs4IE7xkEbVWU JVW8JwCFI7km07C267AKxVWUAVWUtwC20s026c02F40E14v26r1j6r18MI8I3I0E7480Y4 vE14v26r106r1rMI8E67AF67kF1VAFwI0_JF0_Jw1lIxkGc2Ij64vIr41lIxAIcVC0I7IY x2IY67AKxVW8JVW5JwCI42IY6xIIjxv20xvEc7CjxVAFwI0_Gr0_Cr1lIxAIcVCF04k26c xKx2IYs7xG6r1j6r1xMIIF0xvEx4A2jsIE14v26r4j6F4UMIIF0xvEx4A2jsIEc7CjxVAF wI0_Gr0_Gr1UYxBIdaVFxhVjvjDU0xZFpf9x07jz5lbUUUUU= Content-Type: text/plain; charset="utf-8" If the DMA_BUS_MODE_SFT_RESET bit is 1 before software reset, there is no need to do anything for this abnormal case, just return -EINVAL immediately in loongson_dwmac_fix_reset(). Signed-off-by: Tiezhu Yang --- drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c b/drivers= /net/ethernet/stmicro/stmmac/dwmac-loongson.c index e1591e6217d4..6d10077666c7 100644 --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c @@ -513,6 +513,9 @@ static int loongson_dwmac_fix_reset(void *priv, void __= iomem *ioaddr) { u32 value =3D readl(ioaddr + DMA_BUS_MODE); =20 + if (value & DMA_BUS_MODE_SFT_RESET) + return -EINVAL; + value |=3D DMA_BUS_MODE_SFT_RESET; writel(value, ioaddr + DMA_BUS_MODE); =20 --=20 2.42.0