From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtpout-02.galae.net (smtpout-02.galae.net [185.246.84.56]) (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 692B5418A4A; Mon, 27 Jul 2026 13:34:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.246.84.56 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785159269; cv=none; b=TAREnVK5GjHAazs/kAolhLPIBj4rzEgoeIS3VmOxIIv2LlGb/cDQTuE9/uYXxyS0EUQEPbHAcWNnTvWCnAhv2gwpBC/0/H6QfnRTKoda0/x+7CiVjPCVpdibkATfc9HblItrgJ7lDYyep//UkJdCMbvKZR/w9nrCER75qxGmm9w= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785159269; c=relaxed/simple; bh=8nCC74OizPibC/VmYtaMPSzN+yTYakaPlTbJM80iJz8=; h=Mime-Version:Content-Type:Date:Message-Id:Subject:Cc:To:From: References:In-Reply-To; b=EYG0ubiOKKpFBuB7nSPfq2ww/QkdEYcaHruxbS9641ZxjJpLCy697pA/RbszBQt5zAYpPdY6txDb6LUshmGtyPQGo7RRo6ZioRZhovDHHCFSUIHP1Kvx6RuzBHIqLTT4OfuKFKhXsiIplvPFj7BaRJr+1vIFCEGVLzlb5JnLkDU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com; spf=pass smtp.mailfrom=bootlin.com; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b=qJTkWcYM; arc=none smtp.client-ip=185.246.84.56 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="qJTkWcYM" Received: from smtpout-01.galae.net (smtpout-01.galae.net [212.83.139.233]) by smtpout-02.galae.net (Postfix) with ESMTPS id BDAC11A1288; Mon, 27 Jul 2026 13:34:25 +0000 (UTC) Received: from mail.galae.net (mail.galae.net [212.83.136.155]) by smtpout-01.galae.net (Postfix) with ESMTPS id 8A468601BE; Mon, 27 Jul 2026 13:34:25 +0000 (UTC) Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id CB39311C13417; Mon, 27 Jul 2026 15:34:18 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=dkim; t=1785159260; h=from:subject:date:message-id:to:cc:mime-version:content-type: content-transfer-encoding:in-reply-to:references; bh=I6ymMscZuXDmnMu0xXwCDGg0OdCFa5YfwRRztwaKfKQ=; b=qJTkWcYMohV8KiTV9f6VrOhta4xlpQginYR+u15Db47qm6wM7feR12P8aPBrpe+rDDZkLT 96pNjf5FwFMFnsNEL1JYbsBAWoHTZCOADvymFWqPqUc2FscE3+5r7MCx6CgfEImWJDM/qO VfkPpot0zXzvPI6TtD/zCCvHx/Nh+PrneN5pnyJWFh+4HKIYVQoXMpmOwkR1dAq8mbuDbb UWUzLb5UK2gBqj/9Ap82+/KeyDEQ1NSMMSzsJYxdGpB7vR0cxaSOcgHSpJmM/4qcI3t6wj ROdb+FvXUFMrrzRfqtm06mDR+xWOd61SuOeNuBBjW12zcALasLu2FFRyjJsAtQ== Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Mon, 27 Jul 2026 15:34:18 +0200 Message-Id: Subject: Re: [PATCH] staging: media: tegra-video: vi: fix probe failure on skipped last port Cc: "Sowjanya Komatineni" , "Thierry Reding" , "Jonathan Hunter" , "Mauro Carvalho Chehab" , "Hans Verkuil" , "Greg Kroah-Hartman" , , , , To: "Hao-Qun Huang" , "Luca Ceresoli" From: "Luca Ceresoli" X-Mailer: aerc 0.21.0 References: <20260707152425.571254-1-alvinhuang0603@gmail.com> <20260727204307.24353.alvinhuang0603@gmail.com> In-Reply-To: <20260727204307.24353.alvinhuang0603@gmail.com> X-Last-TLS-Session-Version: TLSv1.3 Hello Hao-Qun, On Mon Jul 27, 2026 at 2:43 PM CEST, Hao-Qun Huang wrote: > On Mon Jul 27, 2026 at 1:10 PM CEST, Luca Ceresoli wrote: >> Do you have a real use case where ths failure happens? > > No, I found it by reading the code. I went back and checked the in-tree > tegra DTs that have vi ports: lg-x3 (p880), nexus7-grouper and > asus-transformer all link the port through to a CSI channel endpoint with > data-lanes, which parses fine, and asus-tf600t has no remote-endpoint so > it skips on the !parent path, which leaves ret alone. So no in-tree boar= d > hits this. > >> Also, mixing two different return values may solve a bug but makes for m= ore >> intricated. I'd rather second a fix based on moving the whole foreach lo= op >> body into a subfunction, and make the foreach loop body as simple as >> calling the subfunction and handling returned errors. This would fix the >> code making it more readbale. > > Agreed. This one was already committed to media.git/next on Jul 18 > though, Ah, I missed that, I got no e-mail notification about the patch being applied. > so I would rather send the subfunction split as a cleanup on top > than respin it, which also keeps the stable backport small. I have that > version building here and can post it. Yes, I'd appreciate that. > If you would rather have the committed patch dropped and replaced by a v2 > with the refactor, say so and I will send that instead. No need, thanks. Best regards, Luca -- Luca Ceresoli, Bootlin Embedded Linux and Kernel engineering https://bootlin.com