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=1792689496; b=jRFkYX/P7Esa+0s5SkEY/4+WNymwSfp2J/TE+RG05RiWvgSvatt/LubsPRTMM7L8vtmY m5YqvD42w4OYhm5+67tWdtaioaJt1xZmZ8xAD/z9tisu9nNIvWR2zcWjQqoBtUrQC3RyF FuJgvu5B0mrFWBMv/oLqrxnBl/dCppfH8WQU6VrixeGq5unqr5J//8mW2GX65jCMVTnKV G7/IDYuZNQmljgoyx4PXMCZyD3Ws/gjfgo/+69JDJbYo4cbdongAqKJ3ZaXq20tbhdf/j H3vy4+B4INqFw/Z3lK/UXkgLjIn8T+97r98l3jowY1Painh8wAq+GHG5qgoMYOHgcmA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1792689496; h=Received:DKIM-Signature:Message-ID:From:Subject:Reply-To:To:Cc: In-Reply-To:References:Content-Type:Content-Transfer-Encoding:Date; bh=/X4XejafuQIpUOwNFg22E5HeWcGy38qZ4HqGferYaFY=; b=0wwI1pyoPkzYkg9hTJGdesnIysByrKnE/gVSMjbt2sYYJHrhLrcxAbqjeLJbyBHGkI3c Y+BXs+CmGHqysO+fVsli9Yum59Z9VCO18Tt4uINlpccDv5zMLhtQjjcBjxThKrdHVNtup 69ZlPxLwWpYBbHPwAvL17n3F9H44OEhe7LX5TH6S494AxTIKsPKVGR3bA6LGxnYlrv+DA SUDQYQug2Z6dln01fYjPFvSYC4SsJKsPQWkOR24HcYTGTvn/Uyi9QGuvrBJFYV+DWVdrK 47oD1XZSs8hNI4NuqM8d6e13FJCtAw6lhM6Ih+8MhaDSyKN7U10suHBZXc5G9U4dT5Q== 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=Hw4UREuj; 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 36C72606A319 for ; Thu, 22 Oct 2026 17:18:15 +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=Hw4UREuj Received: by smtp.kernel.org (Postfix) with ESMTPSA id B0DFB1F01825; Thu, 22 Oct 2026 17:18:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792689495; bh=/X4XejafuQIpUOwNFg22E5HeWcGy38qZ4HqGferYaFY=; h=From:Subject:Reply-To:To:Cc:In-Reply-To:References:Date; b=Hw4UREujOxM3iu1TeLc/mqJCZRbCciaGNEOcwB0SmXe8L6pvvyYpT6vZULoU5ZgP8 hlrPrp7aGMeDXL3Y5JF4H1I1cqh3GQ5UtEzfsX474isB9COLVO+vi1vpykdS9X9NAm sjYXABH+UwGYH8hafxbwqwxKmomeXCrqLGg+/2hZQGK7uvW0JvoLaNqGAD+8DWx8/0 xq3PZZKJgSV1vDM1v16VCp8fg7aKIn0k9/zD8HYyyg8VA6Bf++pfc+j/PLa4Is6ueF DgfsmGwDZb02HtSBI7qOC2kt8Hmu7cizaELg0hOM/RXr1Dx8SPzjSsCHgEgkWvR/JS 6cJlVmPe48gbw== Message-ID: From: sashiko-bot@kernel.org Subject: Re: [PATCH] serial: 8250: calculate TX length before preparing DMA flow control Reply-To: sashiko-reviews@lists.linux.dev To: "James Hilliard" Cc: linux-serial@vger.kernel.org In-Reply-To: <20261022-submit-serial-8250-dma-tx-length-v1-v1-1-18cecc89a099@gmail.com> References: <20261022-submit-serial-8250-dma-tx-length-v1-v1-1-18cecc89a099@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Date: Thu, 22 Oct 2026 17:18:15 +0000 X-Mailing-List: linux-serial@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list > The Renesas RZ/N1 preparation hook programs the UART DMA block size from > dma->tx_size. The generic TX path calls that hook before calculating the > length of the new transfer, so it programs zero on the first transfer and > the previous length on subsequent transfers. >=20 > Calculate the scatterlist length before calling the preparation hook so > the UART flow controller and DMA descriptor use the same transfer size. >=20 > Fixes: aa63d786cea2 ("serial: 8250: dw: Add support for DMA flow controll= ing devices") > Signed-off-by: James Hilliard Sashiko has reviewed this patch and found no issues. --=20 Sashiko AI review =C2=B7 https://sashiko.dev/#/patchset/20261022-submit-ser= ial-8250-dma-tx-length-v1-v1-1-18cecc89a099@gmail.com?part=3D1