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From: Heikki Krogerus <heikki.krogerus@linux.intel.com>
To: Guenter Roeck <linux@roeck-us.net>
Cc: Hans de Goede <hdegoede@redhat.com>, linux-usb@vger.kernel.org
Subject: [PATCH v2 1/7] usb: typec: Copy everything from struct typec_capability during registration
Date: Fri,  4 Oct 2019 18:08:11 +0300
Message-ID: <20191004150817.45413-2-heikki.krogerus@linux.intel.com> (raw)
In-Reply-To: <20191004150817.45413-1-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 | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
index 94a3eda62add..0bbf10c8ad58 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);
 }
 
@@ -1579,9 +1581,10 @@ 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;
+	port->cap = kmemdup(cap, sizeof(*cap), GFP_KERNEL);
 
 	device_initialize(&port->dev);
 	port->dev.class = typec_class;
-- 
2.23.0


  reply index

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-04 15:08 [PATCH v2 0/7] usb: typec: Small API improvement Heikki Krogerus
2019-10-04 15:08 ` Heikki Krogerus [this message]
2019-10-04 15:08 ` [PATCH v2 2/7] usb: typec: Introduce typec_get_drvdata() Heikki Krogerus
2019-10-04 15:08 ` [PATCH v2 3/7] usb: typec: Separate the operations vector Heikki Krogerus
2019-10-04 15:17   ` Heikki Krogerus
2019-10-05 17:36   ` Guenter Roeck
2019-10-07  8:44     ` Heikki Krogerus
2019-10-04 15:08 ` [PATCH v2 4/7] usb: typec: tcpm: Start using struct typec_operations Heikki Krogerus
2019-10-05 17:39   ` Guenter Roeck
2019-10-04 15:08 ` [PATCH v2 5/7] usb: typec: tps6598x: " Heikki Krogerus
2019-10-04 15:08 ` [PATCH v2 6/7] usb: typec: ucsi: " Heikki Krogerus
2019-10-04 15:08 ` [PATCH v2 7/7] usb: typec: Remove the callback members from struct typec_capability Heikki Krogerus
2019-10-05 17:37   ` Guenter Roeck

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