[PATCH v1] drm/tegra: gem: Correct iommu_map_sg() error checking

[Dmitry Osipenko]

iommu_map_sg() doesn't return a error value, but a size of the requested
IOMMU mapping or zero in case of error.

Signed-off-by: Dmitry Osipenko <dig...@gmail.com>
---
 drivers/gpu/drm/tegra/gem.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/tegra/gem.c b/drivers/gpu/drm/tegra/gem.c
index ab1e53d434e8..710d3c289b2e 100644
--- a/drivers/gpu/drm/tegra/gem.c
+++ b/drivers/gpu/drm/tegra/gem.c
@@ -114,7 +114,7 @@ static const struct host1x_bo_ops tegra_bo_ops = {
 static int tegra_bo_iommu_map(struct tegra_drm *tegra, struct tegra_bo *bo)
 {
        int prot = IOMMU_READ | IOMMU_WRITE;
-       ssize_t err;
+       int err;
 
        if (bo->mm)
                return -EBUSY;
@@ -135,15 +135,14 @@ static int tegra_bo_iommu_map(struct tegra_drm *tegra, 
struct tegra_bo *bo)
 
        bo->paddr = bo->mm->start;
 
-       err = iommu_map_sg(tegra->domain, bo->paddr, bo->sgt->sgl,
-                          bo->sgt->nents, prot);
-       if (err < 0) {
-               dev_err(tegra->drm->dev, "failed to map buffer: %zd\n", err);
+       bo->size = iommu_map_sg(tegra->domain, bo->paddr, bo->sgt->sgl,
+                               bo->sgt->nents, prot);
+       if (!bo->size) {
+               dev_err(tegra->drm->dev, "failed to map buffer\n");
+               err = -ENOMEM;
                goto remove;
        }
 
-       bo->size = err;
-
        mutex_unlock(&tegra->mm_lock);
 
        return 0;
-- 
2.15.1