From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 4EFCB4CEE47 for ; Wed, 16 Sep 2026 15:41:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789573269; cv=none; b=qgz/X3+Bd26o6vV1/mrWc4dJLD2Ed8KynL9RYuIlzPdCSRd4pdVVOZzHd7Nhlf21pFMdQEwUspmDI8fbmu+Mdi01Ao+CtIBfH3ZY6t1EJuHZeYYo7h/P6XOLuJOHLDl0+HWBf8AWg+wS7VbbcRAxNfqmLo1fO6B4iWnTZcEQ7p4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789573269; c=relaxed/simple; bh=mGG7K92u/FcEdYd9Ujrj8ZGrhsURxTmOf+9gjC+2mPI=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=GOccxVmej+fFzQ6ASsc1+Mj+hEiwB/ir5P4eawlQrbByswYvaIgHuMfJzwZFIz/oAFAK9DTyyP9GffxwfAvaIsLgBXsA1o+r0WwR4eQgi19utPzCQJV1UKXw3gn2D3bK+0uKpjabioug2Zr7uLwQtwk3lNIO6u8zPnN7d4MgQGQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=fiBmOihx; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="fiBmOihx" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D683B1F000FF; Wed, 16 Sep 2026 15:41:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789573266; bh=dBv+NnMTFmspqqlJymZUyd1FQuZG+e+E+cdzedBWLds=; h=Subject:To:Cc:From:Date; b=fiBmOihxJ5Q2SUqDbOKYmCwjdAmAFrOKR9tRg+qkEYDWYgmMUAVrw23VwfzNZiNfs Ix6aIugOeSh9ItPR5UKmV8nCy64OEJlUgBXBPZeHnMen+X+Wu7arRlbtJGCIHuht1f vkVWKFMvdinp1NKxhgLxPujfyCA118jId0uRsAcs= Subject: FAILED: patch "[PATCH] net: macb: initialize PTP state before registering clock" failed to apply to 6.6-stable tree To: runyu.xiao@seu.edu.cn,kuba@kernel.org,theo.lebrun@bootlin.com,vadim.fedorenko@linux.dev Cc: From: Date: Wed, 16 Sep 2026 16:30:45 +0100 Message-ID: <2026091645-winnings-facsimile-bba7@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The patch below does not apply to the 6.6-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y git checkout FETCH_HEAD git cherry-pick -x e1406330d70e56dd44fa6fbafc86e77e5c80c122 # git commit -s git send-email --to '' --in-reply-to '2026091645-winnings-facsimile-bba7@gregkh' --subject-prefix 'PATCH 6.6.y' 'HEAD^..' Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From e1406330d70e56dd44fa6fbafc86e77e5c80c122 Mon Sep 17 00:00:00 2001 From: Runyu Xiao Date: Tue, 8 Sep 2026 18:39:24 +0800 Subject: [PATCH] net: macb: initialize PTP state before registering clock MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit gem_ptp_init() registers the PTP clock before initializing bp->tsu_clk_lock and the TSU hardware. Since ptp_clock_register() publishes the PTP character device, userspace may invoke PTP callbacks before the lock and hardware are ready. In addition, gem_ptp_init() is called from both the interface open and resume paths. Reinitializing tsu_clk_lock there can reset the lock while timestamp processing is using it. This race is theoretical and has not been observed in practice. Initialize tsu_clk_lock once during probe and initialize the TSU before registering the PTP clock. Fixes: ab91f0a9b5f4 ("net: macb: Add hardware PTP support") Cc: stable@vger.kernel.org Link: https://lore.kernel.org/netdev/20260904030439.3994047-1-runyu.xiao@seu.edu.cn/ Reviewed-by: Théo Lebrun Reviewed-by: Vadim Fedorenko Signed-off-by: Runyu Xiao Link: https://patch.msgid.link/20260908103924.607033-1-runyu.xiao@seu.edu.cn Signed-off-by: Jakub Kicinski diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c index 77dec2d6e3fb..4cb5d7088d43 100644 --- a/drivers/net/ethernet/cadence/macb_main.c +++ b/drivers/net/ethernet/cadence/macb_main.c @@ -5883,6 +5883,7 @@ static int macb_probe(struct platform_device *pdev) } spin_lock_init(&bp->lock); spin_lock_init(&bp->stats_lock); + spin_lock_init(&bp->tsu_clk_lock); /* setup capabilities */ macb_configure_caps(bp, macb_config); diff --git a/drivers/net/ethernet/cadence/macb_ptp.c b/drivers/net/ethernet/cadence/macb_ptp.c index e5195d7dac1d..6d9166389988 100644 --- a/drivers/net/ethernet/cadence/macb_ptp.c +++ b/drivers/net/ethernet/cadence/macb_ptp.c @@ -334,6 +334,7 @@ void gem_ptp_init(struct net_device *netdev) bp->tsu_rate = bp->ptp_info->get_tsu_rate(bp); bp->ptp_clock_info.max_adj = bp->ptp_info->get_ptp_max_adj(); gem_ptp_init_timer(bp); + gem_ptp_init_tsu(bp); bp->ptp_clock = ptp_clock_register(&bp->ptp_clock_info, &netdev->dev); if (IS_ERR(bp->ptp_clock)) { pr_err("ptp clock register failed: %ld\n", @@ -345,10 +346,6 @@ void gem_ptp_init(struct net_device *netdev) return; } - spin_lock_init(&bp->tsu_clk_lock); - - gem_ptp_init_tsu(bp); - dev_info(&bp->pdev->dev, "%s ptp clock registered.\n", GEM_PTP_TIMER_NAME); }