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-rw-r--r--net/devres.c95
1 files changed, 95 insertions, 0 deletions
diff --git a/net/devres.c b/net/devres.c
new file mode 100644
index 0000000000..5ccf6ca311
--- /dev/null
+++ b/net/devres.c
@@ -0,0 +1,95 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * This file contains all networking devres helpers.
+ */
+
+#include <linux/device.h>
+#include <linux/etherdevice.h>
+#include <linux/netdevice.h>
+
+struct net_device_devres {
+ struct net_device *ndev;
+};
+
+static void devm_free_netdev(struct device *dev, void *this)
+{
+ struct net_device_devres *res = this;
+
+ free_netdev(res->ndev);
+}
+
+struct net_device *devm_alloc_etherdev_mqs(struct device *dev, int sizeof_priv,
+ unsigned int txqs, unsigned int rxqs)
+{
+ struct net_device_devres *dr;
+
+ dr = devres_alloc(devm_free_netdev, sizeof(*dr), GFP_KERNEL);
+ if (!dr)
+ return NULL;
+
+ dr->ndev = alloc_etherdev_mqs(sizeof_priv, txqs, rxqs);
+ if (!dr->ndev) {
+ devres_free(dr);
+ return NULL;
+ }
+
+ devres_add(dev, dr);
+
+ return dr->ndev;
+}
+EXPORT_SYMBOL(devm_alloc_etherdev_mqs);
+
+static void devm_unregister_netdev(struct device *dev, void *this)
+{
+ struct net_device_devres *res = this;
+
+ unregister_netdev(res->ndev);
+}
+
+static int netdev_devres_match(struct device *dev, void *this, void *match_data)
+{
+ struct net_device_devres *res = this;
+ struct net_device *ndev = match_data;
+
+ return ndev == res->ndev;
+}
+
+/**
+ * devm_register_netdev - resource managed variant of register_netdev()
+ * @dev: managing device for this netdev - usually the parent device
+ * @ndev: device to register
+ *
+ * This is a devres variant of register_netdev() for which the unregister
+ * function will be called automatically when the managing device is
+ * detached. Note: the net_device used must also be resource managed by
+ * the same struct device.
+ */
+int devm_register_netdev(struct device *dev, struct net_device *ndev)
+{
+ struct net_device_devres *dr;
+ int ret;
+
+ /* struct net_device must itself be managed. For now a managed netdev
+ * can only be allocated by devm_alloc_etherdev_mqs() so the check is
+ * straightforward.
+ */
+ if (WARN_ON(!devres_find(dev, devm_free_netdev,
+ netdev_devres_match, ndev)))
+ return -EINVAL;
+
+ dr = devres_alloc(devm_unregister_netdev, sizeof(*dr), GFP_KERNEL);
+ if (!dr)
+ return -ENOMEM;
+
+ ret = register_netdev(ndev);
+ if (ret) {
+ devres_free(dr);
+ return ret;
+ }
+
+ dr->ndev = ndev;
+ devres_add(ndev->dev.parent, dr);
+
+ return 0;
+}
+EXPORT_SYMBOL(devm_register_netdev);