linux-kernel - Re: [PATCH] drm/ttm: properly unmap dma page upon failure

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Message-ID: <20190706173309.GA111051@google.com>
Date:   Sat, 6 Jul 2019 11:33:09 -0600
From:   Yu Zhao <yuzhao@...gle.com>
To:     Christian Koenig <christian.koenig@....com>,
        Huang Rui <ray.huang@....com>,
        Junwei Zhang <Jerry.Zhang@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/ttm: properly unmap dma page upon failure

On Mon, Mar 25, 2019 at 02:22:50PM -0600, Yu Zhao wrote:
> dma_unmap_page() must be called with exactly the same dma address
> and size returned by dma_map_page(). Otherwise, the function may
> fail.
> 
> This is at least the case for debug_dma_unmap_page() and AMD iommu
> unmap_page callback.

Hi, can we please take this fix? Thanks.