[PATCH 4.4 18/25] drm/msm: Fix wrong size calculation

From: Greg Kroah-Hartman
Date: Tue Feb 01 2022 - 13:19:47 EST


From: Xianting Tian <xianting.tian@xxxxxxxxxxxxxxxxx>

commit 0a727b459ee39bd4c5ced19d6024258ac87b6b2e upstream.

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>
Link: https://lore.kernel.org/r/20220112123334.749776-1-xianting.tian@xxxxxxxxxxxxxxxxx
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/gpu/drm/msm/msm_drv.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -286,7 +286,7 @@ static int msm_init_vram(struct drm_devi
ret = of_address_to_resource(node, 0, &r);
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);
} else
#endif