Fixes a bug where unbinding of the GPU would leave the oem i2c adapter registered resuling in a null pointer dereference when applications try to access the invalid device.
Cc: Harry Wentland <[email protected]> Cc: Alex Deucher <[email protected]> Signed-off-by: Geoffrey McRae <[email protected]> Change-Id: I9466b489859c3963653976e54818254596b5a13b --- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c index b944abea306d..ef7b59fe6f4d 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -2957,6 +2957,16 @@ static int dm_oem_i2c_hw_init(struct amdgpu_device *adev) return 0; } +static void dm_oem_i2c_hw_fini(struct amdgpu_device *adev) +{ + struct amdgpu_display_manager *dm = &adev->dm; + if (dm->oem_i2c) { + i2c_del_adapter(&dm->oem_i2c->base); + kfree(dm->oem_i2c); + dm->oem_i2c = NULL; + } +} + /** * dm_hw_init() - Initialize DC device * @ip_block: Pointer to the amdgpu_ip_block for this hw instance. @@ -3007,7 +3017,7 @@ static int dm_hw_fini(struct amdgpu_ip_block *ip_block) { struct amdgpu_device *adev = ip_block->adev; - kfree(adev->dm.oem_i2c); + dm_oem_i2c_hw_fini(adev); amdgpu_dm_hpd_fini(adev); -- 2.43.0
