[PATCH] drm/amdgpu: check if hubbub is NULL in debugfs/amdgpu_dm_capabilities

[Peter Shkenev]

HUBBUB structure is not initialized on DCE hardware, so check if it is NULL
to avoid null dereference while accessing amdgpu_dm_capabilities file in
debugfs.

Signed-off-by: Peter Shkenev <mustela@erminea.space>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c 
b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
index c7d13e743e6c..b726bcd18e29 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
@@ -3988,7 +3988,7 @@ static int capabilities_show(struct seq_file *m, void 
*unused)
 
        struct hubbub *hubbub = dc->res_pool->hubbub;
 
-       if (hubbub->funcs->get_mall_en)
+       if (hubbub && hubbub->funcs->get_mall_en)
                hubbub->funcs->get_mall_en(hubbub, &mall_in_use);
 
        if (dc->cap_funcs.get_subvp_en)
-- 
2.50.1