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2023-12-11 072de836f53be56a70cecf70b43ae43b7ce17376 
 kernel/drivers/net/usb/usbnet.c
....@@ -1,20 +1,8 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /*
23  * USB Network driver infrastructure
34  * Copyright (C) 2000-2005 by David Brownell
45  * Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com>
5
- *
6
- * This program is free software; you can redistribute it and/or modify
7
- * it under the terms of the GNU General Public License as published by
8
- * the Free Software Foundation; either version 2 of the License, or
9
- * (at your option) any later version.
10
- *
11
- * This program is distributed in the hope that it will be useful,
12
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
13
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14
- * GNU General Public License for more details.
15
- *
16
- * You should have received a copy of the GNU General Public License
17
- * along with this program; if not, see <http://www.gnu.org/licenses/>.
186  */
197 
208 /*
....@@ -45,9 +33,6 @@
4533 #include <linux/slab.h>
4634 #include <linux/kernel.h>
4735 #include <linux/pm_runtime.h>
48
-
49
-#define DRIVER_VERSION		"22-Aug-2005"
50
-
5136 
5237 /*-------------------------------------------------------------------------*/
5338 
....@@ -122,7 +107,7 @@
122107 				if (!usb_endpoint_dir_in(&e->desc))
123108 					continue;
124109 				intr = 1;
125
-				/* FALLTHROUGH */
110
+				fallthrough;
126111 			case USB_ENDPOINT_XFER_BULK:
127112 				break;
128113 			default:
....@@ -609,7 +594,7 @@
609594 	case -EPIPE:
610595 		dev->net->stats.rx_errors++;
611596 		usbnet_defer_kevent (dev, EVENT_RX_HALT);
612
-		// FALLTHROUGH
597
+		fallthrough;
613598 
614599 	/* software-driven interface shutdown */
615600 	case -ECONNRESET:		/* async unlink */
....@@ -640,7 +625,7 @@
640625 	/* data overrun ... flush fifo? */
641626 	case -EOVERFLOW:
642627 		dev->net->stats.rx_over_errors++;
643
-		// FALLTHROUGH
628
+		fallthrough;
644629 
645630 	default:
646631 		state = rx_cleanup;
....@@ -811,7 +796,7 @@
811796 int usbnet_stop (struct net_device *net)
812797 {
813798 	struct usbnet		*dev = netdev_priv(net);
814
-	struct driver_info	*info = dev->driver_info;
799
+	const struct driver_info *info = dev->driver_info;
815800 	int			retval, pm, mpn;
816801 
817802 	clear_bit(EVENT_DEV_OPEN, &dev->flags);
....@@ -845,13 +830,11 @@
845830 
846831 	mpn = !test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags);
847832 
848
-	/* deferred work (task, timer, softirq) must also stop.
849
-	 * can't flush_scheduled_work() until we drop rtnl (later),
850
-	 * else workers could deadlock; so make workers a NOP.
851
-	 */
833
+	/* deferred work (timer, softirq, task) must also stop */
852834 	dev->flags = 0;
853835 	del_timer_sync (&dev->delay);
854836 	tasklet_kill (&dev->bh);
837
+	cancel_work_sync(&dev->kevent);
855838 	if (!pm)
856839 		usb_autopm_put_interface(dev->intf);
857840 
....@@ -874,7 +857,7 @@
874857 {
875858 	struct usbnet		*dev = netdev_priv(net);
876859 	int			retval;
877
-	struct driver_info	*info = dev->driver_info;
860
+	const struct driver_info *info = dev->driver_info;
878861 
879862 	if ((retval = usb_autopm_get_interface(dev->intf)) < 0) {
880863 		netif_info(dev, ifup, dev->net,
....@@ -998,31 +981,9 @@
998981 void usbnet_get_stats64(struct net_device *net, struct rtnl_link_stats64 *stats)
999982 {
1000983 	struct usbnet *dev = netdev_priv(net);
1001
-	unsigned int start;
1002
-	int cpu;
1003984 
1004985 	netdev_stats_to_stats64(stats, &net->stats);
1005
-
1006
-	for_each_possible_cpu(cpu) {
1007
-		struct pcpu_sw_netstats *stats64;
1008
-		u64 rx_packets, rx_bytes;
1009
-		u64 tx_packets, tx_bytes;
1010
-
1011
-		stats64 = per_cpu_ptr(dev->stats64, cpu);
1012
-
1013
-		do {
1014
-			start = u64_stats_fetch_begin_irq(&stats64->syncp);
1015
-			rx_packets = stats64->rx_packets;
1016
-			rx_bytes = stats64->rx_bytes;
1017
-			tx_packets = stats64->tx_packets;
1018
-			tx_bytes = stats64->tx_bytes;
1019
-		} while (u64_stats_fetch_retry_irq(&stats64->syncp, start));
1020
-
1021
-		stats->rx_packets += rx_packets;
1022
-		stats->rx_bytes += rx_bytes;
1023
-		stats->tx_packets += tx_packets;
1024
-		stats->tx_bytes += tx_bytes;
1025
-	}
986
+	dev_fetch_sw_netstats(stats, dev->stats64);
1026987 }
1027988 EXPORT_SYMBOL_GPL(usbnet_get_stats64);
1028989 
....@@ -1059,7 +1020,6 @@
10591020 	struct usbnet *dev = netdev_priv(net);
10601021 
10611022 	strlcpy (info->driver, dev->driver_name, sizeof info->driver);
1062
-	strlcpy (info->version, DRIVER_VERSION, sizeof info->version);
10631023 	strlcpy (info->fw_version, dev->driver_info->description,
10641024 		sizeof info->fw_version);
10651025 	usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
....@@ -1120,12 +1080,13 @@
11201080 	clear_bit(EVENT_LINK_CHANGE, &dev->flags);
11211081 }
11221082 
1123
-static void usbnet_set_rx_mode(struct net_device *net)
1083
+void usbnet_set_rx_mode(struct net_device *net)
11241084 {
11251085 	struct usbnet		*dev = netdev_priv(net);
11261086 
11271087 	usbnet_defer_kevent(dev, EVENT_SET_RX_MODE);
11281088 }
1089
+EXPORT_SYMBOL_GPL(usbnet_set_rx_mode);
11291090 
11301091 static void __handle_set_rx_mode(struct usbnet *dev)
11311092 {
....@@ -1214,7 +1175,7 @@
12141175 	}
12151176 
12161177 	if (test_bit (EVENT_LINK_RESET, &dev->flags)) {
1217
-		struct driver_info	*info = dev->driver_info;
1178
+		const struct driver_info *info = dev->driver_info;
12181179 		int			retval = 0;
12191180 
12201181 		clear_bit (EVENT_LINK_RESET, &dev->flags);
....@@ -1305,7 +1266,7 @@
13051266 
13061267 /*-------------------------------------------------------------------------*/
13071268 
1308
-void usbnet_tx_timeout (struct net_device *net)
1269
+void usbnet_tx_timeout (struct net_device *net, unsigned int txqueue)
13091270 {
13101271 	struct usbnet		*dev = netdev_priv(net);
13111272 
....@@ -1344,11 +1305,11 @@
13441305 	total_len += skb_headlen(skb);
13451306 
13461307 	for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1347
-		struct skb_frag_struct *f = &skb_shinfo(skb)->frags[i];
1308
+		skb_frag_t *f = &skb_shinfo(skb)->frags[i];
13481309 
13491310 		total_len += skb_frag_size(f);
1350
-		sg_set_page(&urb->sg[i + s], f->page.p, f->size,
1351
-				f->page_offset);
1311
+		sg_set_page(&urb->sg[i + s], skb_frag_page(f), skb_frag_size(f),
1312
+			    skb_frag_off(f));
13521313 	}
13531314 	urb->transfer_buffer_length = total_len;
13541315 
....@@ -1362,7 +1323,7 @@
13621323 	unsigned int			length;
13631324 	struct urb		*urb = NULL;
13641325 	struct skb_data		*entry;
1365
-	struct driver_info	*info = dev->driver_info;
1326
+	const struct driver_info *info = dev->driver_info;
13661327 	unsigned long		flags;
13671328 	int retval;
13681329 
....@@ -1541,6 +1502,7 @@
15411502 			continue;
15421503 		case tx_done:
15431504 			kfree(entry->urb->sg);
1505
+			fallthrough;
15441506 		case rx_cleanup:
15451507 			usb_free_urb (entry->urb);
15461508 			dev_kfree_skb (skb);
....@@ -1605,6 +1567,7 @@
16051567 	struct usbnet		*dev;
16061568 	struct usb_device	*xdev;
16071569 	struct net_device	*net;
1570
+	struct urb		*urb;
16081571 
16091572 	dev = usb_get_intfdata(intf);
16101573 	usb_set_intfdata(intf, NULL);
....@@ -1621,9 +1584,11 @@
16211584 	net = dev->net;
16221585 	unregister_netdev (net);
16231586 
1624
-	cancel_work_sync(&dev->kevent);
1625
-
1626
-	usb_scuttle_anchored_urbs(&dev->deferred);
1587
+	while ((urb = usb_get_from_anchor(&dev->deferred))) {
1588
+		dev_kfree_skb(urb->context);
1589
+		kfree(urb->sg);
1590
+		usb_free_urb(urb);
1591
+	}
16271592 
16281593 	if (dev->driver_info->unbind)
16291594 		dev->driver_info->unbind (dev, intf);
....@@ -1667,7 +1632,7 @@
16671632 	struct usbnet			*dev;
16681633 	struct net_device		*net;
16691634 	struct usb_host_interface	*interface;
1670
-	struct driver_info		*info;
1635
+	const struct driver_info	*info;
16711636 	struct usb_device		*xdev;
16721637 	int				status;
16731638 	const char			*name;
....@@ -1683,7 +1648,7 @@
16831648 	}
16841649 
16851650 	name = udev->dev.driver->name;
1686
-	info = (struct driver_info *) prod->driver_info;
1651
+	info = (const struct driver_info *) prod->driver_info;
16871652 	if (!info) {
16881653 		dev_dbg (&udev->dev, "blacklisted by %s\n", name);
16891654 		return -ENODEV;
....@@ -1762,10 +1727,6 @@
17621727 		/* WWAN devices should always be named "wwan%d" */
17631728 		if ((dev->driver_info->flags & FLAG_WWAN) != 0)
17641729 			strcpy(net->name, "wwan%d");
1765
-
1766
-		/* LTE devices should always be named "lte%d" */
1767
-		if ((dev->driver_info->flags & FLAG_LTE) != 0)
1768
-			strcpy(net->name, "lte%d");
17691730 
17701731 		/* devices that cannot do ARP */
17711732 		if ((dev->driver_info->flags & FLAG_NOARP) != 0)
....@@ -2009,7 +1970,7 @@
20091970 		   cmd, reqtype, value, index, size);
20101971 
20111972 	if (size) {
2012
-		buf = kmalloc(size, GFP_KERNEL);
1973
+		buf = kmalloc(size, GFP_NOIO);
20131974 		if (!buf)
20141975 			goto out;
20151976 	}
....@@ -2041,7 +2002,7 @@
20412002 		   cmd, reqtype, value, index, size);
20422003 
20432004 	if (data) {
2044
-		buf = kmemdup(data, size, GFP_KERNEL);
2005
+		buf = kmemdup(data, size, GFP_NOIO);
20452006 		if (!buf)
20462007 			goto out;
20472008 	} else {
....@@ -2142,7 +2103,7 @@
21422103 int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype,
21432104 			   u16 value, u16 index, const void *data, u16 size)
21442105 {
2145
-	struct usb_ctrlrequest *req = NULL;
2106
+	struct usb_ctrlrequest *req;
21462107 	struct urb *urb;
21472108 	int err = -ENOMEM;
21482109 	void *buf = NULL;
....@@ -2160,7 +2121,7 @@
21602121 		if (!buf) {
21612122 			netdev_err(dev->net, "Error allocating buffer"
21622123 				   " in %s!\n", __func__);
2163
-			goto fail_free;
2124
+			goto fail_free_urb;
21642125 		}
21652126 	}
21662127 
....@@ -2184,14 +2145,21 @@
21842145 	if (err < 0) {
21852146 		netdev_err(dev->net, "Error submitting the control"
21862147 			   " message: status=%d\n", err);
2187
-		goto fail_free;
2148
+		goto fail_free_all;
21882149 	}
21892150 	return 0;
21902151 
2152
+fail_free_all:
2153
+	kfree(req);
21912154 fail_free_buf:
21922155 	kfree(buf);
2193
-fail_free:
2194
-	kfree(req);
2156
+	/*
2157
+	 * avoid a double free
2158
+	 * needed because the flag can be set only
2159
+	 * after filling the URB
2160
+	 */
2161
+	urb->transfer_flags = 0;
2162
+fail_free_urb:
21952163 	usb_free_urb(urb);
21962164 fail:
21972165 	return err;
....@@ -2204,7 +2172,7 @@
22042172 {
22052173 	/* Compiler should optimize this out. */
22062174 	BUILD_BUG_ON(
2207
-		FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data));
2175
+		sizeof_field(struct sk_buff, cb) < sizeof(struct skb_data));
22082176 
22092177 	eth_random_addr(node_id);
22102178 	return 0;