linux-kernel - [PATCH] drm/amdgpu: check if hubbub is NULL in debugfs/amdgpu_dm

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Message-ID: <20250717204819.731936-1-mustela@erminea.space>
Date: Thu, 17 Jul 2025 23:48:17 +0300
From: Peter Shkenev <mustela@...inea.space>
To: alexander.deucher@....com,
	amd-gfx@...ts.freedesktop.org,
	christian.koenig@....com
Cc: airlied@...il.com,
	simona@...ll.ch,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] drm/amdgpu: check if hubbub is NULL in debugfs/amdgpu_dm_capabilities

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@...inea.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