drm/amdgpu: Adjust debugfs register access permissions

commit b46dadf7e3cfe26d0b109c9c3d81b278d6c75361 upstream.

Regular users shouldn't have read access.

Reviewed-by: Yang Wang <kevinyang.wang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit c0cfd2e652553d607b910be47d0cc5a7f3a78641)
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
index 527a3434bb1ce7adfb7f7b834ce31ee4fe72f8ae..963e106d32eed0d57c7b876a5bd5b63cff1179a8 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
@@ -1641,7 +1641,7 @@ int amdgpu_debugfs_regs_init(struct amdgpu_device *adev)
 
        for (i = 0; i < ARRAY_SIZE(debugfs_regs); i++) {
                ent = debugfs_create_file(debugfs_regs_names[i],
-                                         S_IFREG | 0444, root,
+                                         S_IFREG | 0400, root,
                                          adev, debugfs_regs[i]);
                if (!i && !IS_ERR_OR_NULL(ent))
                        i_size_write(ent->d_inode, adev->rmmio_size);