Re: [PATCH] drm/msm: Fix wrong size calculation

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On 12/01/2022 15:33, Xianting Tian wrote:
For example, memory-region in .dts as below,
	reg = <0x0 0x50000000 0x0 0x20000000>

We can get below values,
struct resource r;
r.start = 0x50000000;
r.end	= 0x6fffffff;

So the size should be:
size = r.end - r.start + 1 = 0x20000000

Signed-off-by: Xianting Tian <xianting.tian@xxxxxxxxxxxxxxxxx>

Fixes: 072f1f9168ed ("drm/msm: add support for "stolen" mem")
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>

---
  drivers/gpu/drm/msm/msm_drv.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index 892c04365..f04a2337d 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -466,7 +466,7 @@ static int msm_init_vram(struct drm_device *dev)
  		of_node_put(node);
  		if (ret)
  			return ret;
-		size = r.end - r.start;
+		size = r.end - r.start + 1;
  		DRM_INFO("using VRAM carveout: %lx@%pa\n", size, &r.start);
/* if we have no IOMMU, then we need to use carveout allocator.


--
With best wishes
Dmitry



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