change otg to host mode

hc

2024-05-11 04dd17822334871b23ea2862f7798fb0e0007777

 kernel/drivers/net/caif/caif_virtio.c
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@@ -1,9 +1,9 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * Copyright (C) ST-Ericsson AB 2013
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  * Authors: Vicram Arv
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  *	    Dmitry Tarnyagin <dmitry.tarnyagin@lockless.no>
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  *	    Sjur Brendeland
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- * License terms: GNU General Public License (GPL) version 2
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  */
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 #include <linux/module.h>
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 #include <linux/if_arp.h>
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@@ -519,7 +519,7 @@
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 }
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 /* Put the CAIF packet on the virtio ring and kick the receiver */
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-static int cfv_netdev_tx(struct sk_buff *skb, struct net_device *netdev)
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+static netdev_tx_t cfv_netdev_tx(struct sk_buff *skb, struct net_device *netdev)
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 {
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 	struct cfv_info *cfv = netdev_priv(netdev);
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 	struct buf_info *buf_info;
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@@ -623,11 +623,7 @@
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 /* Create debugfs counters for the device */
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 static inline void debugfs_init(struct cfv_info *cfv)
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 {
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-	cfv->debugfs =
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-		debugfs_create_dir(netdev_name(cfv->ndev), NULL);
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-
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-	if (IS_ERR(cfv->debugfs))
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-		return;
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+	cfv->debugfs = debugfs_create_dir(netdev_name(cfv->ndev), NULL);
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 	debugfs_create_u32("rx-napi-complete", 0400, cfv->debugfs,
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 			   &cfv->stats.rx_napi_complete);
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@@ -656,7 +652,7 @@
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 	const char *cfv_netdev_name = "cfvrt";
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 	struct net_device *netdev;
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 	struct cfv_info *cfv;
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-	int err = -EINVAL;
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+	int err;
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 	netdev = alloc_netdev(sizeof(struct cfv_info), cfv_netdev_name,
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 			      NET_NAME_UNKNOWN, cfv_netdev_setup);
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@@ -727,13 +723,21 @@
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 	/* Carrier is off until netdevice is opened */
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 	netif_carrier_off(netdev);
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+	/* serialize netdev register + virtio_device_ready() with ndo_open() */
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+	rtnl_lock();
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+
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 	/* register Netdev */
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-	err = register_netdev(netdev);
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+	err = register_netdevice(netdev);
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 	if (err) {
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+		rtnl_unlock();
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 		dev_err(&vdev->dev, "Unable to register netdev (%d)\n", err);
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 		goto err;
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 	}
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+	virtio_device_ready(vdev);
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+
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+	rtnl_unlock();
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+
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 	debugfs_init(cfv);
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 	return 0;