[PATCH 17/22] drm/amd/display: Check link_res->hpo_dp_link_enc before using it

[Aurabindo Pillai]

From: Alex Hung <alex.h...@amd.com>

[WHAT & HOW]
Functions dp_enable_link_phy and dp_disable_link_phy can pass link_res
without initializing hpo_dp_link_enc and it is necessary to check for
null before dereferencing.

This fixes 1 FORWARD_NULL issue reported by Coverity.

Fixes: abdcd93214 ("drm/amd/display: Check link_res->hpo_dp_link_enc before 
using it")
Reviewed-by: Rodrigo Siqueira <rodrigo.sique...@amd.com>
Signed-off-by: Alex Hung <alex.h...@amd.com>
---
 drivers/gpu/drm/amd/display/dc/link/hwss/link_hwss_hpo_dp.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/link/hwss/link_hwss_hpo_dp.c 
b/drivers/gpu/drm/amd/display/dc/link/hwss/link_hwss_hpo_dp.c
index d0148f10dfc0..cec68c5dba13 100644
--- a/drivers/gpu/drm/amd/display/dc/link/hwss/link_hwss_hpo_dp.c
+++ b/drivers/gpu/drm/amd/display/dc/link/hwss/link_hwss_hpo_dp.c
@@ -110,6 +110,11 @@ void enable_hpo_dp_link_output(struct dc_link *link,
                enum clock_source_id clock_source,
                const struct dc_link_settings *link_settings)
 {
+       if (!link_res->hpo_dp_link_enc) {
+               DC_LOG_ERROR("%s: invalid hpo_dp_link_enc\n", __func__);
+               return;
+       }
+
        if (link->dc->res_pool->dccg->funcs->set_symclk32_le_root_clock_gating)
                
link->dc->res_pool->dccg->funcs->set_symclk32_le_root_clock_gating(
                                link->dc->res_pool->dccg,
-- 
2.39.2