From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [213.167.242.64]) (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 BEB296BFA8; Tue, 14 May 2024 10:14:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=213.167.242.64 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715681670; cv=none; b=OhTpKZbm7xCdmvl8SzwlcyegzMK1JB+/XxD20DbBJcjF9sW7+I6QB7xW1TFzb7I5qrNqo6T5vMV3HVN9Pog64ZTZyRVR4fao5aB2TxFuQFt/c0fGpTC2NaQURP76z7sifLqcjHf4MR7ESj4KL8c1cndIPrJ/wQm0DioIlpalC4M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715681670; c=relaxed/simple; bh=AJTZYpaGAZvZ9qTcyVYkjf6UB4DVz5QNTtQh4NrqSHk=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=bikoC3MrnCBmifg8bBmL483PiLBCAlySlPcBpAEF/4GDaPt4I310DqZIlhO0wBkw/Kubti7nQHWgxiAar8JtNNg7d4Sr+50Ua62DhLF+H6d2xf35lCrWzM3Fe7lh7xa91Ewrpq8QNmMbeZGYrI3Yvvai4/qyX6tIRHh/jWW+fXg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ideasonboard.com; spf=pass smtp.mailfrom=ideasonboard.com; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b=sLrLZOA2; arc=none smtp.client-ip=213.167.242.64 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="sLrLZOA2" Received: from [10.91.1.31] (unknown [149.14.240.163]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 159FA22A; Tue, 14 May 2024 12:14:14 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1715681654; bh=AJTZYpaGAZvZ9qTcyVYkjf6UB4DVz5QNTtQh4NrqSHk=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=sLrLZOA2CO694RBNyFaS7aT+ihrHBBoGdpMQMaByNMgcWlfR1s2e4rONXUFkFlYSN 2iaAbH9rTbihLIk0fQY+qz/UwTjyb/pqNhEb1AUSJY3glGd3dl6WAX0h4X35CSbxQ+ 9Xa6AomL8g0r9MgmZKVT8vjG00ich9niDcwDQ6JA= Message-ID: <3ba30852-cb50-497e-8968-a29d0b9a1986@ideasonboard.com> Date: Tue, 14 May 2024 11:14:18 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] media: ipu-bridge: fix error code in ipu_bridge_init() To: Andy Shevchenko , Dan Carpenter Cc: Bingbu Cao , Mauro Carvalho Chehab , Sakari Ailus , Hans de Goede , linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org References: Content-Language: en-US From: Dan Scally Autocrypt: addr=dan.scally@ideasonboard.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Hello On 10/05/2024 16:55, Andy Shevchenko wrote: > On Fri, May 10, 2024 at 06:43:31PM +0300, Dan Carpenter wrote: >> Return -EINVAL if "bridge->n_sensors == 0". Don't return success. > LGTM, but I leave the main Q "Is it really the error case?" to the maintainers. > I would imagine the use case where either from the following may happen: > 1) the sensors are all new and not listed as supported; > 2) there no sensors connected for real. > > In both cases I don't see this as a critical error that we can't enumerate > the bridge itself. > I have no strong feelings on this really. The CIO2 driver, before the bridge was a thing, didn't treat a lack of connected endpoints as an error case and still completed probe if the cio2_parse_firmware() function doesn't find any connected endpoints...but perhaps it should have behaved this way all along. Is there value in having the cio2 device probed, but useless? I can't think of any at the moment. The patch contents themselves look good to me.