Re: [PATCH v4 3/6] iommu: add ARM short descriptor page table allocator.

[Robin Murphy]

On 09/10/15 16:57, Will Deacon wrote:
> On Tue, Sep 22, 2015 at 03:12:47PM +0100, Yong Wu wrote:
> >       I would like to show you a problem I met, The recursion here may
> > lead to stack overflow while we test FHD video decode.
> >
> >      From the log, I get the internal variable in the error case: the
> > "size" is 0x100000, the "iova" is 0xfea00000, but at that time the
> > "blk_size" is 0x1000 as it was the map of small-page. so it enter the
> > recursion here.
> >
> >      After check the unmap flow, there is only a iommu_unmap in
> > __iommu_dma_unmap, and it won't check the physical address align in
> > iommu_unmap.
>
> That sounds like a bug in __iommu_dma_unmap. Robin?

Isn't it just cf27ec930be9 again wearing different trousers? All I do is 
call iommu_unmap with the same total size that was mapped originally.

Robin.

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