Re: [RESEND PATCH] iommu: Split iommu_unmaps

[Joerg Roedel <joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>]

On Mon, Jun 17, 2013 at 07:57:34PM -0600, Alex Williamson wrote:
> iommu_map splits requests into pages that the iommu driver reports
> that it can handle.  The iommu_unmap path does not do the same.  This
> can cause problems not only from callers that might expect the same
> behavior as the map path, but even from the failure path of iommu_map,
> should it fail at a point where it has mapped and needs to unwind a
> set of pages that the iommu driver cannot handle directly.  amd_iommu,
> for example, will BUG_ON if asked to unmap a non power of 2 size.
> 
> Fix this by extracting and generalizing the sizing code from the
> iommu_map path and use it for both map and unmap.

Very true, thanks for fixing this.

Applied to the core branch.