On Mon, Sep 07, 2015 at 03:44:43PM +0200, Hans Verkuil wrote:

+	cec->adap = cec_create_adapter(&s5p_cec_adap_ops, cec,
+		CEC_NAME, CEC_CAP_STATE |
+		CEC_CAP_PHYS_ADDR | CEC_CAP_LOG_ADDRS | CEC_CAP_IO |
+		CEC_CAP_IS_SOURCE,
+		0, THIS_MODULE, &pdev->dev);
+	ret = PTR_ERR_OR_ZERO(cec->adap);
+	if (ret)
+		return ret;
+	cec->adap->available_log_addrs = 1;
+
+	platform_set_drvdata(pdev, cec);
+	pm_runtime_enable(dev);

This is really not a good interface.

"cec_create_adapter" creates and registers the adapter, at which point it
becomes available to userspace.  However, you haven't finished setting it
up, so it's possible to nip in here and start using it before the setup
has completed.  This needs fixing.

-- 
FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up
according to speedtest.net.