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 00C1C19C540; Tue, 1 Jul 2025 05:15:11 +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=1751346912; cv=none; b=j2bFTYzogCpwh3/q3MApEeJJhaI6Jf9d5/nMwzfNlYY/jWhlmESsFf+C7eoxfbNRhzA2L2mW6qMWoNUDgQQCbDRmNOqmVYyCXvQoC2qCm1v3/F7+YSGWW926eNE2jejxzvLRSr6coWxVuoZKOp/fzPvJpOu8Q8YFez4QKXS/3l8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751346912; c=relaxed/simple; bh=dPYeU3gWfacVLOnxyAio8wfmeyC5iym8ETd7fTIJXSE=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=HClJ+OqeHqs0ZgrpoJxGV8aAlv5NNtjr4j71zug7S1VVA2GqgGrHUlzd+6Q2nX1QeqzZNKLOzu4shnVolDVKQL97i61MOwa4TJ2mc/WogqG1AQjJB2SL2rJWUdqKtBAav+/eyZNETkum3yL4bQUqxFVWC+JKUmWd81TxNYocQkc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=EXk6ce2Z; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="EXk6ce2Z" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5C256C4CEEB; Tue, 1 Jul 2025 05:15:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1751346911; bh=dPYeU3gWfacVLOnxyAio8wfmeyC5iym8ETd7fTIJXSE=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=EXk6ce2Z7pY4Zk1qrF3KwY98IF7643FreNdeQpppNOhjKsikY+XxGcKwyWa8Yhe0u UEhVqsXShJRT12D+z2f/AZaepB4nyhODwa5aVOgeCqSyzAmsaZkAqX06bPmehH2aj9 JNgsKIe2oRtPufxSXwUrT9Mr4JskLekdiNuNddgXtcXfFgT5pXW+w8T/Q6ldOAuLGu yXNnDLcrDHyGaInBCuQaFUj8cdUfOGI79kc5CFyCTj9EcE6dZKP7ffffrIuNY9QDqT VQwgTuHGsx4lLdJDETY7/3GbeLKCCDZi9y4v2dC8qIWQk39ojfZEu+aUNULmzgGBvZ JTLLhPwMHelPw== Message-ID: <11c0c230-7a19-460c-99cb-18caf62aaedc@kernel.org> Date: Tue, 1 Jul 2025 07:15:08 +0200 Precedence: bulk X-Mailing-List: linux-serial@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] pch_uart: Fix dma_sync_sg_for_device() nents value To: Andy Shevchenko Cc: Thomas Fourier , Tomoya MORINAGA , linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org References: <20250630121021.106643-2-fourier.thomas@gmail.com> <624ba0b2-afe0-4111-96b9-8b678b6472fe@kernel.org> Content-Language: en-US From: Jiri Slaby Autocrypt: addr=jirislaby@kernel.org; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 30. 06. 25, 15:13, Andy Shevchenko wrote: > On Mon, Jun 30, 2025 at 03:01:01PM +0200, Jiri Slaby wrote: >> On 30. 06. 25, 14:10, Thomas Fourier wrote: >>> The dma_sync_sg_for_device() functions should be called with the same >>> nents as the dma_map_sg(), not the value the map function returned. >> >> Care to explain why do you intend to sync more than mapped? "should be >> called" is way to vague. > > It's documented as the correct use of the DMA streaming API. > Should we go deeper and understand why? That's IMO enough if he put/referenced this in the commit log... -- js suse labs