From: jsg <jsg@openbsd.org>
Date: Fri, 11 Oct 2024 03:00:56 +0000 (+0000)
Subject: drm/amd/display: enable_hpo_dp_link_output: Check link_res->hpo_dp_link_enc before... 
X-Git-Url: http://artulab.com/gitweb/?a=commitdiff_plain;h=fcdb63029ed4f0b0f9a71749e1bed1e333fd8289;p=openbsd

drm/amd/display: enable_hpo_dp_link_output: Check link_res->hpo_dp_link_enc before using it

From Alex Hung
e0b065ec636d66022ab7057e1635e9a941a42820 in linux-6.6.y/6.6.55
d925c04d974c657d10471c0c2dba3bc9c7d994ee in mainline linux
---

diff --git a/sys/dev/pci/drm/amd/display/dc/link/hwss/link_hwss_hpo_dp.c b/sys/dev/pci/drm/amd/display/dc/link/hwss/link_hwss_hpo_dp.c
index d0b0553dbdd..9a349de0f6d 100644
--- a/sys/dev/pci/drm/amd/display/dc/link/hwss/link_hwss_hpo_dp.c
+++ b/sys/dev/pci/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,