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 646CA35F8D5; Wed, 19 Nov 2025 13:30:06 +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=1763559006; cv=none; b=OsxAGs2Y6GLMGTc9RE1o86bmKfN9qh7YHNhLXd/zPbBSjqPucs00ELuz01jUGreovu+j7xoMtuhnelfjMF5WQqNj07mw6YNBFvpkReilu/lXxHFTQ/fZddzwzV2qxiu7AmTKfuZMQKNoyxdpZDeT65Zke+Dos2nT7/PSpk7L7pU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763559006; c=relaxed/simple; bh=T77xD4ouQwJfrrfoYJul3nkxhRgI6f45RqfVLeuXla0=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=SV2ksn5aIc874Bm0gUUWa5npBeqC0QNTxP9cpad0e8/DxZBpnAMj3tiHW+emQUJZj3FBxzhl+zlWL46XLQ6CLc3jVzGjGuGdLabiYV97B45YWUrQrJ6K94ii4loEvzDMqzVQ8ZLVgy45bllcJDNj7qbLRBgzkXgQUad5jNZW0Q4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=CJmkRcmE; 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="CJmkRcmE" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B920DC19425; Wed, 19 Nov 2025 13:30:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1763559005; bh=T77xD4ouQwJfrrfoYJul3nkxhRgI6f45RqfVLeuXla0=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=CJmkRcmExDwPt0NuCANFi896HuCFEIGU3LYAoLvhl8S3uU9mfBypEzVSr32GsqZy0 9/i6r19RZmZ62wtupphqnAO8hbyri/wPrlx+2egmQAVVAfXzAjAQg9//PYFGan5bni pk0qcg+vRudcykukDUhBBIgqjiqJBtVsRDmSGRqW0pz5Gglk6LGSk41HQnN10/vOll y837YDb/TkXoHX8I8N3jo+MHBgeNPV8Cz170FjUyldCJaY8TGh2bFXWSLULpw+FO6d eb4+355odBMqKRZiIPwYiwF+iwiQXKJMUxv42Leegovr8lnDq2Mv1Ats+WCCrLVsSJ k/AyOs5u/QaIA== Date: Wed, 19 Nov 2025 15:30:00 +0200 From: Leon Romanovsky To: "Tian, Kevin" Cc: Bjorn Helgaas , Logan Gunthorpe , Jens Axboe , Robin Murphy , Joerg Roedel , Will Deacon , Marek Szyprowski , Jason Gunthorpe , Andrew Morton , Jonathan Corbet , Sumit Semwal , Christian =?iso-8859-1?Q?K=F6nig?= , Kees Cook , "Gustavo A. R. Silva" , Ankit Agrawal , Yishai Hadas , Shameer Kolothum , Alex Williamson , Krishnakant Jaju , Matt Ochs , "linux-pci@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-block@vger.kernel.org" , "iommu@lists.linux.dev" , "linux-mm@kvack.org" , "linux-doc@vger.kernel.org" , "linux-media@vger.kernel.org" , "dri-devel@lists.freedesktop.org" , "linaro-mm-sig@lists.linaro.org" , "kvm@vger.kernel.org" , "linux-hardening@vger.kernel.org" , Alex Mastro , Nicolin Chen Subject: Re: [PATCH v8 06/11] dma-buf: provide phys_vec to scatter-gather mapping routine Message-ID: <20251119133000.GB18335@unreal> References: <20251111-dmabuf-vfio-v8-0-fd9aa5df478f@nvidia.com> <20251111-dmabuf-vfio-v8-6-fd9aa5df478f@nvidia.com> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Wed, Nov 19, 2025 at 05:54:55AM +0000, Tian, Kevin wrote: > > From: Leon Romanovsky > > Sent: Tuesday, November 11, 2025 5:58 PM > > + > > + if (dma->state && dma_use_iova(dma->state)) { > > + WARN_ON_ONCE(mapped_len != size); > > then "goto err_unmap_dma". It never should happen, there is no need to provide error unwind to something that you won't get. > > Reviewed-by: Kevin Tian Thanks