drm/amdgpu: Fix memory leak

drm_gem_object_put() should be paired with drm_gem_object_lookup().

All gem objs are saved in fb->base.obj[]. Need put the old first before
assign a new obj.

Trigger VRAM leak by running command below
$ service gdm restart

Signed-off-by: xinhui pan <xinhui.pan@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
index afa5f8a..b05301e 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
@@ -955,8 +955,9 @@ int amdgpu_display_framebuffer_init(struct drm_device *dev,
        }
 
        for (i = 1; i < rfb->base.format->num_planes; ++i) {
+               drm_gem_object_get(rfb->base.obj[0]);
+               drm_gem_object_put(rfb->base.obj[i]);
                rfb->base.obj[i] = rfb->base.obj[0];
-               drm_gem_object_get(rfb->base.obj[i]);
        }
 
        return 0;
@@ -1002,6 +1003,7 @@ amdgpu_display_user_framebuffer_create(struct drm_device *dev,
                return ERR_PTR(ret);
        }
 
+       drm_gem_object_put(obj);
        return &amdgpu_fb->base;
 }