A VRAM size smaller than a page becomes a zero-page TTM range and
causes drm_mm_init() to hit its zero-range BUG check. Reject such a
range before initializing the VRAM manager.
Fixes: 37205891d84f ("drm/ttm: make ttm_range_man_init/takedown take type +
args")
Signed-off-by: Jiale Yao <[email protected]>
---
drivers/gpu/drm/radeon/radeon_ttm.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c
b/drivers/gpu/drm/radeon/radeon_ttm.c
index e7ab8162ac69..925593af1688 100644
--- a/drivers/gpu/drm/radeon/radeon_ttm.c
+++ b/drivers/gpu/drm/radeon/radeon_ttm.c
@@ -69,6 +69,9 @@ struct radeon_device *radeon_get_rdev(struct ttm_device *bdev)
static int radeon_ttm_init_vram(struct radeon_device *rdev)
{
+ if (rdev->mc.real_vram_size < PAGE_SIZE)
+ return -EINVAL;
+
return ttm_range_man_init(&rdev->mman.bdev, TTM_PL_VRAM,
false, rdev->mc.real_vram_size >> PAGE_SHIFT);
}
--
2.34.1
