From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793065207; b=15yoQP4wbepIgJs26/q3R6MrAUNA5xka2ii4szLdW/+wqZrK9wwhoXsUeXW2czqQV84y g7HT6iM8wTFsDkI3nQHkTXoJ62Xky5fc51lvuZeUiQVm46ZEe48/J+coe8uoHZqZwJXlA NCd3WkZHKSamlkdLyl+jhsbzC6KMoY8wVFbhIRdYFLb2/4ZQOvLnx47F4aYJvVxH1XxWD DgbN4KK0ZKUOMlD5bMxKBUx0bU97IoagvJ7pWN75m5LtAXQc89fpANJCMsAq3IpBhEVAi VGADaKC7qytUHnIMeLqdmxt2cbYruvrx7ozd3NgtnxrWlSn1uQNRA2sWkZK7A3LXuzA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793065207; h=Received:DKIM-Signature:Received:Content-Type:MIME-Version: Content-Transfer-Encoding:Subject:From:Message-Id:Date:References: In-Reply-To:To:Cc; bh=oLLGLsviN+AyNUwtthLtGQRS/ZFe1aWIbjzfKtVXnoI=; b=ec+CL2sJuMccwl7xcf74LxlDlM6VLEUEWtLyzcJZj7VhZC1yUj5hrEvkUs5UHv0E6kAK PBqfQZUMqKaAN2elpvGcErCu3z5+53nVOTWSXteZJGGb8DRuYbKywcgU0fF+VQxnVc0kC 0ytVcv1cRmUB8cM8IdFXJLcpuVJELU3aHO1r0ly1IZJWVvz0oYDoGJlKMp0RCqU/Ravdo 9CEpPLXM7nflz2jtrCuG5URtoMUKZ7ORzaQRoSG+MngRqoUsBL66Bkz+f4ht2r6+oQ2tr ew1mYlZBU2ujH8zlVJfpF6o2KlpxIx/Ow5y8yTnbwCyAYlS7yKLjxgvR7fvn8Bvq4Zg== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=i73fqt55; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 33357606A32D; Tue, 27 Oct 2026 01:40:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=i73fqt55 Received: by smtp.kernel.org (Postfix) with ESMTPSA id C7D801F01825; Tue, 27 Oct 2026 01:40:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793065206; bh=oLLGLsviN+AyNUwtthLtGQRS/ZFe1aWIbjzfKtVXnoI=; h=Subject:From:Date:References:In-Reply-To:To:Cc; b=i73fqt558eAnmGmhGUYMZnaF1B+DYgoGrf0uh6aV2cWpFpgZfCNDmbrIEJyR29c+t rut+VhYotqssVs85f0xKoDiKUwXFiS17OzVVedCdJG+1hWnPaCj7Vz8hUCdl+Ei7sk SF2zB9vUZnoWee/Ihzk/a6h/+++0ibndt2kXGFYWbJGsvbDPO0Qz90/Txwhw6XjNEy BpeHaejIFHpMqWmW9FumIP+nVRHEeAL338G6kz3NsHFiB6afYWI5u2fSnBic+TANVi DCtBCmgAVF8yneqrQ1V7iQKxus7ALUBRq2HHXOqmWMZu/Rz6n2VqtXiRoLaSuzbGjd tCeNK0n55iYhQ== Received: from [10.30.226.235] (localhost [IPv6:::1]) by aws-us-west-2-korg-oddjob-rhel9-1.codeaurora.org (Postfix) with ESMTP id BE57A3AA80F1; Tue, 27 Oct 2026 01:40:06 +0000 (UTC) Content-Type: text/plain; charset="utf-8" X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Subject: Re: [PATCH net v3 0/2] net: usb: cdc_ncm/cdc_mbim: fix netpoll lockup in tx_fixup From: patchwork-bot+netdevbpf@kernel.org Message-Id: <179306520565.3504795.7927315467376347222.git-patchwork-notify@kernel.org> Date: Tue, 27 Oct 2026 01:40:05 +0000 References: <20261024-cdc-ncm-netpoll-v3-0-6284ca03f967@tipi-net.de> In-Reply-To: <20261024-cdc-ncm-netpoll-v3-0-6284ca03f967@tipi-net.de> To: Nicolai Buchwitz Cc: oliver@neukum.org, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@kernel.org, kuba@kernel.org, pabeni@redhat.com, sjur.brandeland@stericsson.com, alexey.orishko@gmail.com, bjorn@mork.no, gsuarez@smithmicro.com, leitao@debian.org, linux-usb@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, mke@visotia.com Hello: This series was applied to netdev/net.git (main) by Jakub Kicinski : On Sat, 24 Oct 2026 15:23:05 +0200 you wrote: > Mikkel reported lockups with netconsole on a cdc_ncm device. Further > analysis showed that netpoll calls ndo_start_xmit() with IRQs off but > BHs on while holding the txq lock, and the spin_unlock_bh() in the > tx_fixup paths runs pending softirqs. A transmit from one of them then > spins on that txq lock. > > Patch 1 fixes cdc_ncm. Mikkel tested the v2 version of it. Patch 2 > fixes the same code in cdc_mbim and is untested. > > [...] Here is the summary with links: - [net,v3,1/2] net: usb: cdc_ncm: don't enable BHs in tx_fixup under netpoll https://git.kernel.org/netdev/net/c/108ca34cf4b4 - [net,v3,2/2] net: usb: cdc_mbim: don't enable BHs in tx_fixup under netpoll https://git.kernel.org/netdev/net/c/bfd7ced012c7 You are awesome, thank you! -- Deet-doot-dot, I am a bot. https://korg.docs.kernel.org/patchwork/pwbot.html