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=1792770780; b=hv50j+Xw5DbYMbmyoFGKS/5Aw41QuVAaLaencXECS0RGp4ZGcbM+tOFTpq8GmFhLNSyv Haq1e0b/4BoNSZUYy5uAM4fADz+YJn2NgyL6PbB/wIpaE75mYomEB92RNU0WNXNq+K/7M +ivfDdt2uWDJEimlHGHZYbbH0LxbfS31XGQhCOVLwFRZIA0wtU9zijFsaB+OuoNl40kOf B1/6w8VJwtg+VfF3GN1Jk0j6X5BYdgFYZM3HSMlvLIrf5DLvYR36m/rVQB4fLgXdZJl0O k6qptMWkjw7DgBQCMspQcfvYfTUISWW8Akp9Ko1GomdawBy2MMxfvNu8QyNxrqTHtpA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1792770780; h=Received:DKIM-Signature:Message-ID:From:Subject:Reply-To:To:Cc: In-Reply-To:References:Content-Type:Content-Transfer-Encoding:Date; bh=f5o7X4fxB23ALa8QVU1p/bEnDNLqxhIQ2MO6MYFZMrE=; b=1V3bpaxrX3uVxrwYTmY/QSWPeTlUAME5y6v8KsJKqW761TkwrWbBTjpKWJIgm/YlP7qR /E93yq5GJTj5HarlQXVl2yT33ge3IXQENY57NHW3CQv1Yu3CMKagaWXdTehGNChg0pOi1 EdKe7Ro/i18EQUaIbfkuAkNchO5aultLl0uPvqkZsARbcTKacLQwMcCFZ/oXSh34qixjR 3cjcnamd0a6qYOJZpS0PCiqItBlf9L1uIHuLSakG30FBSWKAVdjLnCb1vZMiz5Oj83zwe B8L0vHPLHMKxQtr8V5icZV9cYo+wgwYu0uwHG57zT2EuFhTz7WZaUBuWRojRuy3MnWQ== 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=PbGZf2FW; 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 CFD0C606A31A for ; Fri, 23 Oct 2026 15:52:59 +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=PbGZf2FW Received: by smtp.kernel.org (Postfix) with ESMTPSA id 511091F01825; Fri, 23 Oct 2026 15:52:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792770779; bh=f5o7X4fxB23ALa8QVU1p/bEnDNLqxhIQ2MO6MYFZMrE=; h=From:Subject:Reply-To:To:Cc:In-Reply-To:References:Date; b=PbGZf2FWRAOUGjfZ9eqtiQhMJRCtvCpgukXO6Aqp/oiI6RnBsa/AwC0ii8ZfrsGVj p8D6zA442k6PWTcMTInMp6zPrH2h4YSnaabRbtm00cprPHj5sCdTwxBjoZrGG9DqPK 2/eL39ftvXD4AeM2XTr8POG+byAbtgGRN6/Ec4iH06qz3vdqXcEWn2ukqLgBleZOIt N7FWgCjZcrDjRCOj9UNW7klwPFW0ElXW17SQxpnBJboB9w9gr5+44R/fwNoxqR0CZT jDzj4XVJ7M2HptBBt9d/LBIcCPxzKElhbkkQGTcOgbv8gHgfZmeY+55HtDlDIDva6U YjxqIpnW5wQcA== Message-ID: From: sashiko-bot@kernel.org Subject: Re: [PATCH v2] 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: <20261023-submit-serial-8250-dma-tx-length-v1-v2-1-c3106ef4d2df@gmail.com> References: <20261023-submit-serial-8250-dma-tx-length-v1-v2-1-c3106ef4d2df@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Date: Fri, 23 Oct 2026 15:52:58 +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: 1788cf6a91d9 ("tty: serial: switch from circ_buf to kfifo") > Cc: stable@vger.kernel.org > Signed-off-by: James Hilliard Sashiko has reviewed this patch and found no issues. --=20 Sashiko AI review =C2=B7 https://sashiko.dev/#/patchset/20261023-submit-ser= ial-8250-dma-tx-length-v1-v2-1-c3106ef4d2df@gmail.com?part=3D1