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. _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
