[PATCH 4/4] media: nvidia: tegra-vde: Fix iommu_map_sgtable() return value check

[Mikko Perttunen <mperttunen@nvidia.com>]

Commit "iommu: return full error code from iommu_map_sg[_atomic]()"
changed iommu_map_sgtable() to return an ssize_t and negative values
in error cases, rather than a size_t and a zero.

Update tegra_vde_iommu_map() to correctly check for errors from
iommu_map_sgtable.

Fixes: ad8f36e4b6b1 ("iommu: return full error code from iommu_map_sg[_atomic]()")
Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
---
 drivers/media/platform/nvidia/tegra-vde/iommu.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/media/platform/nvidia/tegra-vde/iommu.c b/drivers/media/platform/nvidia/tegra-vde/iommu.c
index b1d9d841d944..824d2aa80a43 100644
--- a/drivers/media/platform/nvidia/tegra-vde/iommu.c
+++ b/drivers/media/platform/nvidia/tegra-vde/iommu.c
@@ -25,6 +25,7 @@ int tegra_vde_iommu_map(struct tegra_vde *vde,
 	unsigned long shift;
 	unsigned long end;
 	dma_addr_t addr;
+	ssize_t map_err;
 
 	end = vde->domain->geometry.aperture_end;
 	size = iova_align(&vde->iova, size);
@@ -36,11 +37,11 @@ int tegra_vde_iommu_map(struct tegra_vde *vde,
 
 	addr = iova_dma_addr(&vde->iova, iova);
 
-	size = iommu_map_sgtable(vde->domain, addr, sgt,
-				 IOMMU_READ | IOMMU_WRITE);
-	if (!size) {
+	map_err = iommu_map_sgtable(vde->domain, addr, sgt,
+				    IOMMU_READ | IOMMU_WRITE);
+	if (map_err < 0) {
 		__free_iova(&vde->iova, iova);
-		return -ENXIO;
+		return map_err;
 	}
 
 	*iovap = iova;

-- 
2.53.0