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Subject[PATCH v4 3/3] drm/radeon: fix scatter-gather mapping with user pages
Date
Calls to dma_map_sg may return segments / entries than requested
if they fall on page bounderies. The old implementation did not
support this use case.

Signed-off-by: Shane Francis <bigbeeshane@gmail.com>
---
drivers/gpu/drm/radeon/radeon_ttm.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c
index 3b92311d30b9..b3380ffab4c2 100644
--- a/drivers/gpu/drm/radeon/radeon_ttm.c
+++ b/drivers/gpu/drm/radeon/radeon_ttm.c
@@ -528,7 +528,7 @@ static int radeon_ttm_tt_pin_userptr(struct ttm_tt *ttm)

r = -ENOMEM;
nents = dma_map_sg(rdev->dev, ttm->sg->sgl, ttm->sg->nents, direction);
- if (nents != ttm->sg->nents)
+ if (nents == 0)
goto release_sg;

drm_prime_sg_to_page_addr_arrays(ttm->sg, ttm->pages,
--
2.26.0
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