linux-kernel - [PATCH 3/3] platform/x86: intel_cht_int33fe: Use new API to gain access to the role switch

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20190815112826.81785-4-heikki.krogerus@linux.intel.com>
Date:   Thu, 15 Aug 2019 14:28:26 +0300
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Hans de Goede <hdegoede@...hat.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] platform/x86: intel_cht_int33fe: Use new API to gain access to the role switch

The driver for the Intel USB role mux now always supplies
software node for the role switch, so no longer checking
that, and never creating separate node for the role switch.
>From now on using software_node_find_by_name() function to
get the handle to the USB role switch.

Signed-off-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
---
 drivers/platform/x86/intel_cht_int33fe.c | 57 +++++-------------------
 1 file changed, 10 insertions(+), 47 deletions(-)

diff --git a/drivers/platform/x86/intel_cht_int33fe.c b/drivers/platform/x86/intel_cht_int33fe.c
index 4fbdff48a4b5..1d5d877b9582 100644
--- a/drivers/platform/x86/intel_cht_int33fe.c
+++ b/drivers/platform/x86/intel_cht_int33fe.c
@@ -34,7 +34,6 @@ enum {
 	INT33FE_NODE_MAX17047,
 	INT33FE_NODE_PI3USB30532,
 	INT33FE_NODE_DISPLAYPORT,
-	INT33FE_NODE_ROLE_SWITCH,
 	INT33FE_NODE_USB_CONNECTOR,
 	INT33FE_NODE_MAX,
 };
@@ -45,7 +44,6 @@ struct cht_int33fe_data {
 	struct i2c_client *pi3usb30532;
 
 	struct fwnode_handle *dp;
-	struct fwnode_handle *mux;
 };
 
 static const struct software_node nodes[];
@@ -139,46 +137,10 @@ static const struct software_node nodes[] = {
 	{ "max17047", NULL, max17047_props },
 	{ "pi3usb30532" },
 	{ "displayport" },
-	{ "usb-role-switch" },
 	{ "connector", &nodes[0], usb_connector_props, usb_connector_refs },
 	{ }
 };
 
-static int cht_int33fe_setup_mux(struct cht_int33fe_data *data)
-{
-	struct fwnode_handle *fwnode;
-	struct device *dev;
-	struct device *p;
-
-	fwnode = software_node_fwnode(&nodes[INT33FE_NODE_ROLE_SWITCH]);
-	if (!fwnode)
-		return -ENODEV;
-
-	/* First finding the platform device */
-	p = bus_find_device_by_name(&platform_bus_type, NULL,
-				    "intel_xhci_usb_sw");
-	if (!p)
-		return -EPROBE_DEFER;
-
-	/* Then the mux child device */
-	dev = device_find_child_by_name(p, "intel_xhci_usb_sw-role-switch");
-	put_device(p);
-	if (!dev)
-		return -EPROBE_DEFER;
-
-	/* If there already is a node for the mux, using that one. */
-	if (dev->fwnode)
-		fwnode_remove_software_node(fwnode);
-	else
-		dev->fwnode = fwnode;
-
-	data->mux = fwnode_handle_get(dev->fwnode);
-	put_device(dev);
-	mux_ref.node = to_software_node(data->mux);
-
-	return 0;
-}
-
 static int cht_int33fe_setup_dp(struct cht_int33fe_data *data)
 {
 	struct fwnode_handle *fwnode;
@@ -211,10 +173,9 @@ static void cht_int33fe_remove_nodes(struct cht_int33fe_data *data)
 {
 	software_node_unregister_nodes(nodes);
 
-	if (data->mux) {
-		fwnode_handle_put(data->mux);
+	if (mux_ref.node) {
+		fwnode_handle_put(software_node_fwnode(mux_ref.node));
 		mux_ref.node = NULL;
-		data->mux = NULL;
 	}
 
 	if (data->dp) {
@@ -235,14 +196,16 @@ static int cht_int33fe_add_nodes(struct cht_int33fe_data *data)
 	/* The devices that are not created in this driver need extra steps. */
 
 	/*
-	 * There is no ACPI device node for the USB role mux, so we need to find
-	 * the mux device and assign our node directly to it. That means we
-	 * depend on the mux driver. This function will return -PROBE_DEFER
-	 * until the mux device is registered.
+	 * There is no ACPI device node for the USB role mux, so we need to wait
+	 * until the mux driver has created software node for the mux device.
+	 * It means we depend on the mux driver. This function will return
+	 * -EPROBE_DEFER until the mux device is registered.
 	 */
-	ret = cht_int33fe_setup_mux(data);
-	if (ret)
+	mux_ref.node = software_node_find_by_name(NULL, "intel-xhci-usb-sw");
+	if (!mux_ref.node) {
+		ret = -EPROBE_DEFER;
 		goto err_remove_nodes;
+	}
 
 	/*
 	 * The DP connector does have ACPI device node. In this case we can just
-- 
2.20.1