[PATCH] drm/amdgpu: just disallow reading untouched registers

[Christian König]

From: Christian König <christian.koenig at amd.com>

Not sure what the original intention was here, but returning a random piece of
kernel memory to userspace because we didn't set the value at all is clearly
not a good idea.

This patch disallows reading the register and returns
a proper error code instead.

Signed-off-by: Christian König <christian.koenig at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/vi.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/vi.c b/drivers/gpu/drm/amd/amdgpu/vi.c
index 5c02ec4..f1c2bff 100644
--- a/drivers/gpu/drm/amd/amdgpu/vi.c
+++ b/drivers/gpu/drm/amd/amdgpu/vi.c
@@ -465,15 +465,9 @@ static void vi_detect_hw_virtualization(struct amdgpu_device *adev)
 }
 
 static const struct amdgpu_allowed_register_entry tonga_allowed_read_registers[] = {
-	{mmGB_MACROTILE_MODE7, true},
 };
 
 static const struct amdgpu_allowed_register_entry cz_allowed_read_registers[] = {
-	{mmGB_TILE_MODE7, true},
-	{mmGB_TILE_MODE12, true},
-	{mmGB_TILE_MODE17, true},
-	{mmGB_TILE_MODE23, true},
-	{mmGB_MACROTILE_MODE7, true},
 };
 
 static const struct amdgpu_allowed_register_entry vi_allowed_read_registers[] = {
-- 
2.5.0