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[1/3] drm/bridge: it6505: Initialize AUX channel in it6505_i2c_probe

Message ID 20221012162900.2876686-2-treapking@chromium.org (mailing list archive)
State New, archived
Headers show
Series Clean up it6505 driver and improve synchronization | expand

Commit Message

Pin-yen Lin Oct. 12, 2022, 4:28 p.m. UTC 
During device boot, the HPD interrupt could be triggered before the DRM
subsystem registers it6505 as a DRM bridge. In such cases, the driver
tries to access AUX channel and causes NULL pointer dereference.
Initializing the AUX channel earlier to prevent such error.

Fixes: b5c84a9edcd4 ("drm/bridge: add it6505 driver")
Signed-off-by: Pin-yen Lin <treapking@chromium.org>
---

 drivers/gpu/drm/bridge/ite-it6505.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c
index a4302492cf8d..f7f6c3e20fae 100644
--- a/drivers/gpu/drm/bridge/ite-it6505.c
+++ b/drivers/gpu/drm/bridge/ite-it6505.c
@@ -2871,10 +2871,7 @@  static int it6505_bridge_attach(struct drm_bridge *bridge,
 	}
 
 	/* Register aux channel */
-	it6505->aux.name = "DP-AUX";
-	it6505->aux.dev = dev;
 	it6505->aux.drm_dev = bridge->dev;
-	it6505->aux.transfer = it6505_aux_transfer;
 
 	ret = drm_dp_aux_register(&it6505->aux);
 
@@ -3354,6 +3351,11 @@  static int it6505_i2c_probe(struct i2c_client *client,
 	debugfs_init(it6505);
 	pm_runtime_enable(dev);
 
+	it6505->aux.name = "DP-AUX";
+	it6505->aux.dev = dev;
+	it6505->aux.transfer = it6505_aux_transfer;
+	drm_dp_aux_init(&it6505->aux);
+
 	it6505->bridge.funcs = &it6505_bridge_funcs;
 	it6505->bridge.type = DRM_MODE_CONNECTOR_DisplayPort;
 	it6505->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID |