From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id ACFF41E8324; Mon, 23 Jun 2025 21:14:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750713292; cv=none; b=YuIINQCc63xXlJgmgMDzMeFCDKPV0XeG3LpdgzpxV+kW+yyHG/fD/TGswcTfZLtd4+TIu2DHTCEXvtsB4yLaGfH+9Usx+R0smS4aE98rs7t8oQuGZ5JVrs5QIdshgBk37WKhV6UEBfhgcsz2iOtIsoW/qV9v01UukosoLMsVwVc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750713292; c=relaxed/simple; bh=mTnX5VS75AeswuduYWYCWoiv/suq0mPi83EJX75w9a8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=RLKV/BW4IQtf2Q9a/FcuOXPv738Ykhn3swWVVx6lXCoh9yGNlpyCglt+mlysiEbRqvGjc0yDuJGn8RVIPBOVajwzjdqQ/OkCu/YmJ2743xcI3e5HZDeWEGroZ4LMmseCQSwIlBCFodcKcRpF9C5Po4mB+Kw2ik/fW1Qc+vDMQR8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=wThWyH8V; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="wThWyH8V" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4558DC4CEEA; Mon, 23 Jun 2025 21:14:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1750713292; bh=mTnX5VS75AeswuduYWYCWoiv/suq0mPi83EJX75w9a8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=wThWyH8VjpfCH8QN/ninN51dxZfsD2dSQvdkC0YuKNHGTObFeHbS9woJ0nG90Jw/P HKeXLRM4BlCEMWKs0Jh/qtsHvS5p+IYbPv9AGtLX1Y1uWgO6Q7cGcv6lxTY53BpVO8 EgvqNG2IoMtYogZvHJdKz9+RCvcA2frAWY23gxWM= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Yanqing Wang , Macpaul Lin , Biao Huang , Paolo Abeni , Sasha Levin Subject: [PATCH 5.15 115/411] driver: net: ethernet: mtk_star_emac: fix suspend/resume issue Date: Mon, 23 Jun 2025 15:04:19 +0200 Message-ID: <20250623130636.430368097@linuxfoundation.org> X-Mailer: git-send-email 2.50.0 In-Reply-To: <20250623130632.993849527@linuxfoundation.org> References: <20250623130632.993849527@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Yanqing Wang [ Upstream commit ba99c627aac85bc746fb4a6e2d79edb3ad100326 ] Identify the cause of the suspend/resume hang: netif_carrier_off() is called during link state changes and becomes stuck while executing linkwatch_work(). To resolve this issue, call netif_device_detach() during the Ethernet suspend process to temporarily detach the network device from the kernel and prevent the suspend/resume hang. Fixes: 8c7bd5a454ff ("net: ethernet: mtk-star-emac: new driver") Signed-off-by: Yanqing Wang Signed-off-by: Macpaul Lin Signed-off-by: Biao Huang Link: https://patch.msgid.link/20250528075351.593068-1-macpaul.lin@mediatek.com Signed-off-by: Paolo Abeni Signed-off-by: Sasha Levin --- drivers/net/ethernet/mediatek/mtk_star_emac.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/net/ethernet/mediatek/mtk_star_emac.c b/drivers/net/ethernet/mediatek/mtk_star_emac.c index 639cf1c27dbd4..e336730ba1257 100644 --- a/drivers/net/ethernet/mediatek/mtk_star_emac.c +++ b/drivers/net/ethernet/mediatek/mtk_star_emac.c @@ -1464,6 +1464,8 @@ static __maybe_unused int mtk_star_suspend(struct device *dev) if (netif_running(ndev)) mtk_star_disable(ndev); + netif_device_detach(ndev); + clk_bulk_disable_unprepare(MTK_STAR_NCLKS, priv->clks); return 0; @@ -1488,6 +1490,8 @@ static __maybe_unused int mtk_star_resume(struct device *dev) clk_bulk_disable_unprepare(MTK_STAR_NCLKS, priv->clks); } + netif_device_attach(ndev); + return ret; } -- 2.39.5