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 <dig...@gmail.com>
---
drivers/iommu/tegra-gart.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/iommu/tegra-gart.c b/drivers/iommu/tegra-gart.c
index 55fdb56d85ea..c622f4a4bedd 100644
--- a/drivers/iommu/tegra-gart.c
+++ b/drivers/iommu/tegra-gart.c
@@ -309,7 +309,7 @@ static size_t gart_iommu_unmap(struct iommu_domain *domain,
unsigned long iova,
gart_set_pte(gart, iova, 0);
FLUSH_GART_REGS(gart);
spin_unlock_irqrestore(&gart->pte_lock, flags);
- return 0;
+ return bytes;
}
static phys_addr_t gart_iommu_iova_to_phys(struct iommu_domain *domain,
--
2.13.2
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