linux-kernel - Re: [PATCH v7 01/28] iommufd: Report unmapped bytes in the error path of iopt_unmap_iova

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Message-ID: <20250704125907.GM1209783@nvidia.com>
Date: Fri, 4 Jul 2025 09:59:07 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Nicolin Chen <nicolinc@...dia.com>
Cc: kevin.tian@...el.com, corbet@....net, will@...nel.org,
	bagasdotme@...il.com, robin.murphy@....com, joro@...tes.org,
	thierry.reding@...il.com, vdumpa@...dia.com, jonathanh@...dia.com,
	shuah@...nel.org, jsnitsel@...hat.com, nathan@...nel.org,
	peterz@...radead.org, yi.l.liu@...el.com, mshavit@...gle.com,
	praan@...gle.com, zhangzekun11@...wei.com, iommu@...ts.linux.dev,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-tegra@...r.kernel.org,
	linux-kselftest@...r.kernel.org, patches@...ts.linux.dev,
	mochs@...dia.com, alok.a.tiwari@...cle.com, vasant.hegde@....com,
	dwmw2@...radead.org, baolu.lu@...ux.intel.com
Subject: Re: [PATCH v7 01/28] iommufd: Report unmapped bytes in the error
 path of iopt_unmap_iova_range

On Thu, Jun 26, 2025 at 12:34:32PM -0700, Nicolin Chen wrote:
> There are callers that read the unmapped bytes even when rc != 0. Thus, do
> not forget to report it in the error path too.
> 
> Fixes: 8d40205f6093 ("iommufd: Add kAPI toward external drivers for kernel access")
> Cc: stable@...r.kernel.org
> Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
> ---
>  drivers/iommu/iommufd/io_pagetable.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)

Reviewed-by: Jason Gunthorpe <jgg@...dia.com>

Jason