driver core: Fix device link device name collision

The device link device's name was of the form:
<supplier-dev-name>--<consumer-dev-name>

This can cause name collision as reported here [1] as device names are
not globally unique. Since device names have to be unique within the
bus/class, add the bus/class name as a prefix to the device names used to
construct the device link device name.

So the devuce link device's name will be of the form:
<supplier-bus-name>:<supplier-dev-name>--<consumer-bus-name>:<consumer-dev-name>

[1] - https://lore.kernel.org/lkml/20201229033440.32142-1-michael@walle.cc/

Fixes: 287905e68dd2 ("driver core: Expose device link details in sysfs")
Cc: stable@vger.kernel.org
Reported-by: Michael Walle <michael@walle.cc>
Tested-by: Michael Walle <michael@walle.cc>
Signed-off-by: Saravana Kannan <saravanak@google.com>
Link: https://lore.kernel.org/r/20210110175408.1465657-1-saravanak@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/Documentation/ABI/testing/sysfs-class-devlink b/Documentation/ABI/testing/sysfs-class-devlink
index b662f74..8a21ce5 100644 (file)
--- a/Documentation/ABI/testing/sysfs-class-devlink
+++ b/Documentation/ABI/testing/sysfs-class-devlink
@@ -5,8 +5,8 @@ Description:
                Provide a place in sysfs for the device link objects in the
                kernel at any given time.  The name of a device link directory,
                denoted as ... above, is of the form <supplier>--<consumer>
-               where <supplier> is the supplier device name and <consumer> is
-               the consumer device name.
+               where <supplier> is the supplier bus:device name and <consumer>
+               is the consumer bus:device name.
 
 What:          /sys/class/devlink/.../auto_remove_on
 Date:          May 2020

diff --git a/Documentation/ABI/testing/sysfs-devices-consumer b/Documentation/ABI/testing/sysfs-devices-consumer
index 1f06d74..0809fda 100644 (file)
--- a/Documentation/ABI/testing/sysfs-devices-consumer
+++ b/Documentation/ABI/testing/sysfs-devices-consumer
@@ -4,5 +4,6 @@ Contact:        Saravana Kannan <saravanak@google.com>
 Description:
                The /sys/devices/.../consumer:<consumer> are symlinks to device
                links where this device is the supplier. <consumer> denotes the
-               name of the consumer in that device link. There can be zero or
-               more of these symlinks for a given device.
+               name of the consumer in that device link and is of the form
+               bus:device name. There can be zero or more of these symlinks
+               for a given device.

diff --git a/Documentation/ABI/testing/sysfs-devices-supplier b/Documentation/ABI/testing/sysfs-devices-supplier
index a919e0d..207f597 100644 (file)
--- a/Documentation/ABI/testing/sysfs-devices-supplier
+++ b/Documentation/ABI/testing/sysfs-devices-supplier
@@ -4,5 +4,6 @@ Contact:        Saravana Kannan <saravanak@google.com>
 Description:
                The /sys/devices/.../supplier:<supplier> are symlinks to device
                links where this device is the consumer. <supplier> denotes the
-               name of the supplier in that device link. There can be zero or
-               more of these symlinks for a given device.
+               name of the supplier in that device link and is of the form
+               bus:device name. There can be zero or more of these symlinks
+               for a given device.

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 3819fd0..78f6db1 100644 (file)
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -471,7 +471,9 @@ static int devlink_add_symlinks(struct device *dev,
        struct device *con = link->consumer;
        char *buf;
 
-       len = max(strlen(dev_name(sup)), strlen(dev_name(con)));
+       len = max(strlen(dev_bus_name(sup)) + strlen(dev_name(sup)),
+                 strlen(dev_bus_name(con)) + strlen(dev_name(con)));
+       len += strlen(":");
        len += strlen("supplier:") + 1;
        buf = kzalloc(len, GFP_KERNEL);
        if (!buf)
@@ -485,12 +487,12 @@ static int devlink_add_symlinks(struct device *dev,
        if (ret)
                goto err_con;
 
-       snprintf(buf, len, "consumer:%s", dev_name(con));
+       snprintf(buf, len, "consumer:%s:%s", dev_bus_name(con), dev_name(con));
        ret = sysfs_create_link(&sup->kobj, &link->link_dev.kobj, buf);
        if (ret)
                goto err_con_dev;
 
-       snprintf(buf, len, "supplier:%s", dev_name(sup));
+       snprintf(buf, len, "supplier:%s:%s", dev_bus_name(sup), dev_name(sup));
        ret = sysfs_create_link(&con->kobj, &link->link_dev.kobj, buf);
        if (ret)
                goto err_sup_dev;
@@ -498,7 +500,7 @@ static int devlink_add_symlinks(struct device *dev,
        goto out;
 
 err_sup_dev:
-       snprintf(buf, len, "consumer:%s", dev_name(con));
+       snprintf(buf, len, "consumer:%s:%s", dev_bus_name(con), dev_name(con));
        sysfs_remove_link(&sup->kobj, buf);
 err_con_dev:
        sysfs_remove_link(&link->link_dev.kobj, "consumer");
@@ -521,7 +523,9 @@ static void devlink_remove_symlinks(struct device *dev,
        sysfs_remove_link(&link->link_dev.kobj, "consumer");
        sysfs_remove_link(&link->link_dev.kobj, "supplier");
 
-       len = max(strlen(dev_name(sup)), strlen(dev_name(con)));
+       len = max(strlen(dev_bus_name(sup)) + strlen(dev_name(sup)),
+                 strlen(dev_bus_name(con)) + strlen(dev_name(con)));
+       len += strlen(":");
        len += strlen("supplier:") + 1;
        buf = kzalloc(len, GFP_KERNEL);
        if (!buf) {
@@ -529,9 +533,9 @@ static void devlink_remove_symlinks(struct device *dev,
                return;
        }
 
-       snprintf(buf, len, "supplier:%s", dev_name(sup));
+       snprintf(buf, len, "supplier:%s:%s", dev_bus_name(sup), dev_name(sup));
        sysfs_remove_link(&con->kobj, buf);
-       snprintf(buf, len, "consumer:%s", dev_name(con));
+       snprintf(buf, len, "consumer:%s:%s", dev_bus_name(con), dev_name(con));
        sysfs_remove_link(&sup->kobj, buf);
        kfree(buf);
 }
@@ -752,8 +756,9 @@ struct device_link *device_link_add(struct device *consumer,
 
        link->link_dev.class = &devlink_class;
        device_set_pm_not_required(&link->link_dev);
-       dev_set_name(&link->link_dev, "%s--%s",
-                    dev_name(supplier), dev_name(consumer));
+       dev_set_name(&link->link_dev, "%s:%s--%s:%s",
+                    dev_bus_name(supplier), dev_name(supplier),
+                    dev_bus_name(consumer), dev_name(consumer));
        if (device_register(&link->link_dev)) {
                put_device(consumer);
                put_device(supplier);
@@ -1823,9 +1828,7 @@ const char *dev_driver_string(const struct device *dev)
         * never change once they are set, so they don't need special care.
         */
        drv = READ_ONCE(dev->driver);
-       return drv ? drv->name :
-                       (dev->bus ? dev->bus->name :
-                       (dev->class ? dev->class->name : ""));
+       return drv ? drv->name : dev_bus_name(dev);
 }
 EXPORT_SYMBOL(dev_driver_string);
 

diff --git a/include/linux/device.h b/include/linux/device.h
index 89bb8b8..1779f90 100644 (file)
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -609,6 +609,18 @@ static inline const char *dev_name(const struct device *dev)
        return kobject_name(&dev->kobj);
 }
 
+/**
+ * dev_bus_name - Return a device's bus/class name, if at all possible
+ * @dev: struct device to get the bus/class name of
+ *
+ * Will return the name of the bus/class the device is attached to.  If it is
+ * not attached to a bus/class, an empty string will be returned.
+ */
+static inline const char *dev_bus_name(const struct device *dev)
+{
+       return dev->bus ? dev->bus->name : (dev->class ? dev->class->name : "");
+}
+
 __printf(2, 3) int dev_set_name(struct device *dev, const char *name, ...);
 
 #ifdef CONFIG_NUMA