[PATCH AUTOSEL 6.0 13/44] drm/amd/display: Fix variable dereferenced before check

[Sasha Levin]

From: sunliming <sunlim...@kylinos.cn>

[ Upstream commit 45a92f45f4578ff89da7dc5ef50bab4ef870f3b7 ]

Fixes the following smatch warning:

drivers/gpu/drm/amd/amdgpu/../display/dc/dc_dmub_srv.c:311 
dc_dmub_srv_p_state_delegate()
warn: variable dereferenced before check 'dc' (see line 309)

Reported-by: kernel test robot <l...@intel.com>
Reported-by: Dan Carpenter <dan.carpen...@oracle.com>
Signed-off-by: sunliming <sunlim...@kylinos.cn>
Signed-off-by: Alex Deucher <alexander.deuc...@amd.com>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c 
b/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c
index 52a61b3e5a8b..2e243b70747f 100644
--- a/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c
+++ b/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c
@@ -323,11 +323,13 @@ bool dc_dmub_srv_p_state_delegate(struct dc *dc, bool 
should_manage_pstate, stru
        struct dmub_cmd_fw_assisted_mclk_switch_config *config_data = 
&cmd.fw_assisted_mclk_switch.config_data;
        int i = 0;
        int ramp_up_num_steps = 1; // TODO: Ramp is currently disabled. 
Reenable it.
-       uint8_t visual_confirm_enabled = dc->debug.visual_confirm == 
VISUAL_CONFIRM_FAMS;
+       uint8_t visual_confirm_enabled;
 
        if (dc == NULL)
                return false;
 
+       visual_confirm_enabled = dc->debug.visual_confirm == 
VISUAL_CONFIRM_FAMS;
+
        // Format command.
        cmd.fw_assisted_mclk_switch.header.type = 
DMUB_CMD__FW_ASSISTED_MCLK_SWITCH;
        cmd.fw_assisted_mclk_switch.header.sub_type = 
DMUB_CMD__FAMS_SETUP_FW_CTRL;
-- 
2.35.1