6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Sean Anderson <sean.anderson@xxxxxxxxx>
[ Upstream commit 0743dafefd3f2b92116213f2225ea355001b7948 ]
drm_encoder_cleanup is responsible for calling drm_bridge_detach for
each bridge attached to the encoder. zynqmp_dp_bridge_detach is in turn
responsible for unregistering the AUX bus. However, we never ended up
calling drm_encoder_cleanup in the remove or error paths, so the AUX bus
would stick around after the rest of the driver had been removed.
I don't really understand why drm_mode_config_cleanup doesn't call
drm_encoder_cleanup for us. It will call destroy (which for
simple_encoder is drm_encoder_cleanup) on encoders in the mode_config's
encoder_list.
Should drm_encoder_cleanup get called before or after
drm_atomic_helper_shutdown?
Fixes: 2dfd045c8435 ("drm: xlnx: zynqmp_dpsub: Register AUX bus at bridge attach time")
Signed-off-by: Sean Anderson <sean.anderson@xxxxxxxxx>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@xxxxxxxxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20240503192922.2172314-2-sean.anderson@xxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/gpu/drm/xlnx/zynqmp_kms.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/xlnx/zynqmp_kms.c b/drivers/gpu/drm/xlnx/zynqmp_kms.c
index a7f8611be6f42..44d4a510ad7d6 100644
--- a/drivers/gpu/drm/xlnx/zynqmp_kms.c
+++ b/drivers/gpu/drm/xlnx/zynqmp_kms.c
@@ -434,23 +434,28 @@ static int zynqmp_dpsub_kms_init(struct zynqmp_dpsub *dpsub)
DRM_BRIDGE_ATTACH_NO_CONNECTOR);
if (ret) {
dev_err(dpsub->dev, "failed to attach bridge to encoder\n");
- return ret;
+ goto err_encoder;
}
/* Create the connector for the chain of bridges. */
connector = drm_bridge_connector_init(&dpsub->drm->dev, encoder);
if (IS_ERR(connector)) {
dev_err(dpsub->dev, "failed to created connector\n");
- return PTR_ERR(connector);
+ ret = PTR_ERR(connector);
+ goto err_encoder;
}
ret = drm_connector_attach_encoder(connector, encoder);
if (ret < 0) {
dev_err(dpsub->dev, "failed to attach connector to encoder\n");
- return ret;
+ goto err_encoder;
}
return 0;
+
+err_encoder:
+ drm_encoder_cleanup(encoder);
+ return ret;
}
static void zynqmp_dpsub_drm_release(struct drm_device *drm, void *res)
@@ -530,5 +535,6 @@ void zynqmp_dpsub_drm_cleanup(struct zynqmp_dpsub *dpsub)
drm_dev_unregister(drm);
drm_atomic_helper_shutdown(drm);
+ drm_encoder_cleanup(&dpsub->drm->encoder);
drm_kms_helper_poll_fini(drm);
}
--
2.43.0
