netdev - [PATCH lora-next 02/10] net: lora: add methods for devm registration

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Date:   Tue,  7 Aug 2018 18:32:03 +0100
From:   Ben Whitten <ben.whitten@...il.com>
To:     afaerber@...e.de, starnight@...cu.edu.tw, hasnain.virk@....com
Cc:     netdev@...r.kernel.org, Ben Whitten <ben.whitten@...rdtech.com>
Subject: [PATCH lora-next 02/10] net: lora: add methods for devm registration

From: Ben Whitten <ben.whitten@...rdtech.com>

Follow the devm model so that we can avoid lengthy unwind code.

Signed-off-by: Ben Whitten <ben.whitten@...rdtech.com>
---
 drivers/net/lora/dev.c   | 20 ++++++++++++++++++++
 include/linux/lora/dev.h |  1 +
 2 files changed, 21 insertions(+)

diff --git a/drivers/net/lora/dev.c b/drivers/net/lora/dev.c
index 8c01106..69a8b52 100644
--- a/drivers/net/lora/dev.c
+++ b/drivers/net/lora/dev.c
@@ -84,6 +84,26 @@ void free_loradev(struct net_device *dev)
 }
 EXPORT_SYMBOL_GPL(free_loradev);
 
+static void devm_lora_unregister(struct device *dev, void *res)
+{
+	free_loradev(*(struct net_device **)res);
+}
+
+int devm_lora_register_netdev(struct device *dev, struct net_device *net)
+{
+	struct net_device **ptr;
+
+	ptr = devres_alloc(devm_lora_unregister, sizeof(*ptr), GFP_KERNEL);
+	if (!ptr)
+		return -ENOMEM;
+
+	*ptr = net;
+	devres_add(dev, ptr);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(devm_lora_register_netdev);
+
 static struct rtnl_link_ops lora_link_ops __read_mostly = {
 	.kind = "lora",
 	.setup = lora_setup,
diff --git a/include/linux/lora/dev.h b/include/linux/lora/dev.h
index 153f9b2..3f871c6 100644
--- a/include/linux/lora/dev.h
+++ b/include/linux/lora/dev.h
@@ -32,6 +32,7 @@ static inline int lora_strtoeui(const char *str, lora_eui *val)
 
 struct net_device *alloc_loradev(int sizeof_priv);
 void free_loradev(struct net_device *dev);
+int devm_lora_register_netdev(struct device *dev, struct net_device *net);
 int register_loradev(struct net_device *dev);
 void unregister_loradev(struct net_device *dev);
 int open_loradev(struct net_device *dev);
-- 
2.7.4