On Wed, Jul 05, 2017 at 07:29:48PM +0300, Dmitry Osipenko wrote: > The iommu_unmap() treats zero bytes number returned by an IOMMU driver as > an indicator that unmapping should be stopped. As a result, GART driver > unmaps only the first page entry of the whole range, which is incorrect. > > Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx> > --- > drivers/iommu/tegra-gart.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) Is this perhaps the bug that you were referring to in an earlier patch? Looks to me like you'd run into that bug everytime you try mapping an IOVA that wasn't properly unmapped before. Anyway, this looks like the right thing to do: Acked-by: Thierry Reding <treding@xxxxxxxxxx>
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