[PATCH] drm: bridge: anx7625: don't crash if Type-C port is not used

[Dmitry Baryshkov]

From: Loic Poulain <loic.poulain@xxxxxxxxxxxxxxxx>

The typec_set_*() functions do not tolerate being passed the NULL
typec_port instance. However, if CONFIG_TYPEC is enabled, but anx7625
DT node doesn't have the usb-c connector fwnode, then typec_port remains
NULL, crashing the kernel. Prevent calling typec_set_foo() functions by
checking that ctx->typec_port is not NULL in anx7625_typec_set_status().

 Call trace:
  typec_set_orientation+0x18/0x68 (P)
  anx7625_typec_set_status+0x108/0x13c
  anx7625_work_func+0x124/0x438
  process_one_work+0x214/0x648
  worker_thread+0x1b4/0x358
  kthread+0x14c/0x214
  ret_from_fork+0x10/0x20
 Code: 910003fd a90153f3 aa0003f3 2a0103f4 (f9431400)

Fixes: f81455b2d332 ("drm: bridge: anx7625: implement minimal Type-C support")
Reported-by: Salendarsingh Gaud <sgaud@xxxxxxxxxxxxxxxx>
Signed-off-by: Loic Poulain <loic.poulain@xxxxxxxxxxxxxxxx>
[db: dropped chunk anx7625_typec_unregister(), wrote commit message]
Cc: Amit Kucheria <akucheri@xxxxxxxxxxxxxxxx>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/bridge/analogix/anx7625.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c
index c43519097a45..7f943b6548f3 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.c
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
@@ -1567,6 +1567,9 @@ static void anx7625_typec_set_status(struct anx7625_data *ctx,
 				     unsigned int intr_status,
 				     unsigned int intr_vector)
 {
+	if (!ctx->typec_port)
+		return;
+
 	if (intr_vector & CC_STATUS)
 		anx7625_typec_set_orientation(ctx);
 	if (intr_vector & DATA_ROLE_STATUS) {

---
base-commit: 400a84e1f7a3681ef24d58d49b5d07e81c14f4e9
change-id: 20260215-anx-fix-no-typec-4437cb7e54d2

Best regards,
-- 
With best wishes
Dmitry