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From: Heikki Krogerus <heikki.krogerus@linux.intel.com>
To: Guenter Roeck <linux@roeck-us.net>
Cc: linux-usb@vger.kernel.org
Subject: [PATCH v4 1/9] usb: typec: Copy everything from struct typec_capability during registration
Date: Fri, 11 Oct 2019 18:32:11 +0300
Message-ID: <20191011153219.35701-2-heikki.krogerus@linux.intel.com> (raw)
In-Reply-To: <20191011153219.35701-1-heikki.krogerus@linux.intel.com>

Copying everything from struct typec_capability to struct
typec_port during port registration. This will make sure
that under no circumstances the driver can change the values
in the struct typec_capability that the port uses.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
---
 drivers/usb/typec/class.c | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
index 94a3eda62add..7749933ffce5 100644
--- a/drivers/usb/typec/class.c
+++ b/drivers/usb/typec/class.c
@@ -52,6 +52,7 @@ struct typec_port {
 	struct typec_switch		*sw;
 	struct typec_mux		*mux;
 
+	const struct typec_capability	*orig_cap; /* to be removed */
 	const struct typec_capability	*cap;
 };
 
@@ -968,7 +969,7 @@ preferred_role_store(struct device *dev, struct device_attribute *attr,
 			return -EINVAL;
 	}
 
-	ret = port->cap->try_role(port->cap, role);
+	ret = port->cap->try_role(port->orig_cap, role);
 	if (ret)
 		return ret;
 
@@ -1014,7 +1015,7 @@ static ssize_t data_role_store(struct device *dev,
 		goto unlock_and_ret;
 	}
 
-	ret = port->cap->dr_set(port->cap, ret);
+	ret = port->cap->dr_set(port->orig_cap, ret);
 	if (ret)
 		goto unlock_and_ret;
 
@@ -1071,7 +1072,7 @@ static ssize_t power_role_store(struct device *dev,
 		goto unlock_and_ret;
 	}
 
-	ret = port->cap->pr_set(port->cap, ret);
+	ret = port->cap->pr_set(port->orig_cap, ret);
 	if (ret)
 		goto unlock_and_ret;
 
@@ -1119,7 +1120,7 @@ port_type_store(struct device *dev, struct device_attribute *attr,
 		goto unlock_and_ret;
 	}
 
-	ret = port->cap->port_type_set(port->cap, type);
+	ret = port->cap->port_type_set(port->orig_cap, type);
 	if (ret)
 		goto unlock_and_ret;
 
@@ -1184,7 +1185,7 @@ static ssize_t vconn_source_store(struct device *dev,
 	if (ret)
 		return ret;
 
-	ret = port->cap->vconn_set(port->cap, (enum typec_role)source);
+	ret = port->cap->vconn_set(port->orig_cap, (enum typec_role)source);
 	if (ret)
 		return ret;
 
@@ -1278,6 +1279,7 @@ static void typec_release(struct device *dev)
 	ida_destroy(&port->mode_ids);
 	typec_switch_put(port->sw);
 	typec_mux_put(port->mux);
+	kfree(port->cap);
 	kfree(port);
 }
 
@@ -1579,7 +1581,7 @@ struct typec_port *typec_register_port(struct device *parent,
 	mutex_init(&port->port_type_lock);
 
 	port->id = id;
-	port->cap = cap;
+	port->orig_cap = cap;
 	port->port_type = cap->type;
 	port->prefer_role = cap->prefer_role;
 
@@ -1590,6 +1592,12 @@ struct typec_port *typec_register_port(struct device *parent,
 	port->dev.type = &typec_port_dev_type;
 	dev_set_name(&port->dev, "port%d", id);
 
+	port->cap = kmemdup(cap, sizeof(*cap), GFP_KERNEL);
+	if (!port->cap) {
+		put_device(&port->dev);
+		return ERR_PTR(-ENOMEM);
+	}
+
 	port->sw = typec_switch_get(&port->dev);
 	if (IS_ERR(port->sw)) {
 		put_device(&port->dev);
-- 
2.23.0


  reply index

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-11 15:32 [PATCH v4 0/9] usb: typec: Small API improvement Heikki Krogerus
2019-10-11 15:32 ` Heikki Krogerus [this message]
2019-10-11 17:01   ` [PATCH v4 1/9] usb: typec: Copy everything from struct typec_capability during registration Guenter Roeck
2019-10-11 15:32 ` [PATCH v4 2/9] usb: typec: Introduce typec_get_drvdata() Heikki Krogerus
2019-10-11 15:32 ` [PATCH v4 3/9] usb: typec: Separate the operations vector Heikki Krogerus
2019-10-11 15:32 ` [PATCH v4 4/9] usb: typec: tcpm: Start using struct typec_operations Heikki Krogerus
2019-10-11 15:32 ` [PATCH v4 5/9] usb: typec: tps6598x: " Heikki Krogerus
2019-10-11 15:32 ` [PATCH v4 6/9] usb: typec: ucsi: " Heikki Krogerus
2019-10-11 15:32 ` [PATCH v4 7/9] usb: typec: hd3ss3220: " Heikki Krogerus
2019-10-11 15:32 ` [PATCH v4 8/9] usb: typec: Remove the callback members from struct typec_capability Heikki Krogerus
2019-10-11 15:32 ` [PATCH v4 9/9] usb: typec: Remove unused " Heikki Krogerus

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