Re: [PATCH net-next 02/11] net: Introduce new api for walking upper and lower devices

On Fri, 14 Oct 2016 18:28:42 -0700
David Ahern [off-list ref] wrote:

 
 /**
+ * netdev_has_upper_dev_all - Check if device is linked to an upper device
+ * @dev: device
+ * @upper_dev: upper device to check
+ *
+ * Find out if a device is linked to specified upper device and return true
+ * in case it is. Note that this checks the entire upper device chain.
+ * The caller must hold rcu lock.
+ */
+
+static int __netdev_has_upper_dev(struct net_device *upper_dev, void *data)
+{
+	struct net_device *dev = (struct net_device *)data;
+
+	if (upper_dev == dev)
+		return 1;
+
+	return 0;
+}
+
+bool netdev_has_upper_dev_all_rcu(struct net_device *dev,
+				  struct net_device *upper_dev)
+{
+	if (netdev_walk_all_upper_dev_rcu(dev, __netdev_has_upper_dev,
+					  upper_dev))
+		return true;
+
+	return false;
+}
+EXPORT_SYMBOL(netdev_has_upper_dev_all_rcu);

You should write this more succinctly as:

static bool __netdev_has_upper_dev(struct net_device *upper_dev, void *data)
{
	struct net_device *dev = data;

	return upper_dev == dev;
}

bool netdev_has_upper_dev_all_rcu(struct net_device *dev,
				  struct net_device *upper_dev)
{
	return netdev_walk_all_upper_dev_rcu(dev,
			__netdev_has_upper_dev, upper_dev);
}

No if/else needed. No cast of void * ptr need. Use const if possible?
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