Merge branch 'next' into for-linus

Prepare input updates for 4.15 merge window.

28 files changed, 68 insertions, 46 deletions

diff --git a/net/atm/Makefile b/net/atm/Makefile
index cc50bd1ff1de..bfec0f2d83b5 100644
--- a/net/atm/Makefile
+++ b/net/atm/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 #
 # Makefile for the ATM Protocol Families.
 #
diff --git a/net/atm/addr.c b/net/atm/addr.c
index dcda35c66f15..0530b63f509a 100644
--- a/net/atm/addr.c
+++ b/net/atm/addr.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /* net/atm/addr.c - Local ATM address registry */
 
 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
diff --git a/net/atm/addr.h b/net/atm/addr.h
index 6837e9e7eb13..da3f848411a0 100644
--- a/net/atm/addr.h
+++ b/net/atm/addr.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /* net/atm/addr.h - Local ATM address registry */
 
 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
diff --git a/net/atm/atm_misc.c b/net/atm/atm_misc.c
index 876fbe83e2e4..a30b83c1cb3f 100644
--- a/net/atm/atm_misc.c
+++ b/net/atm/atm_misc.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /* net/atm/atm_misc.c - Various functions for use by ATM drivers */
 
 /* Written 1995-2000 by Werner Almesberger, EPFL ICA */
diff --git a/net/atm/atm_sysfs.c b/net/atm/atm_sysfs.c
index 350bf62b2ae3..5d2fed9f5710 100644
--- a/net/atm/atm_sysfs.c
+++ b/net/atm/atm_sysfs.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /* ATM driver model support. */
 
 #include <linux/kernel.h>
diff --git a/net/atm/br2684.c b/net/atm/br2684.c
index fca84e111c89..4e111196f902 100644
--- a/net/atm/br2684.c
+++ b/net/atm/br2684.c
@@ -252,7 +252,7 @@ static int br2684_xmit_vcc(struct sk_buff *skb, struct net_device *dev,
 
 	ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc;
 	pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev);
-	atomic_add(skb->truesize, &sk_atm(atmvcc)->sk_wmem_alloc);
+	refcount_add(skb->truesize, &sk_atm(atmvcc)->sk_wmem_alloc);
 	ATM_SKB(skb)->atm_options = atmvcc->atm_options;
 	dev->stats.tx_packets++;
 	dev->stats.tx_bytes += skb->len;
diff --git a/net/atm/clip.c b/net/atm/clip.c
index ec527b62f79d..65f706e4344c 100644
--- a/net/atm/clip.c
+++ b/net/atm/clip.c
@@ -60,7 +60,7 @@ static int to_atmarpd(enum atmarp_ctrl_type type, int itf, __be32 ip)
 	skb = alloc_skb(sizeof(struct atmarp_ctrl), GFP_ATOMIC);
 	if (!skb)
 		return -ENOMEM;
-	ctrl = (struct atmarp_ctrl *)skb_put(skb, sizeof(struct atmarp_ctrl));
+	ctrl = skb_put(skb, sizeof(struct atmarp_ctrl));
 	ctrl->type = type;
 	ctrl->itf_num = itf;
 	ctrl->ip = ip;
@@ -137,11 +137,11 @@ static int neigh_check_cb(struct neighbour *n)
 	if (entry->vccs || time_before(jiffies, entry->expires))
 		return 0;
 
-	if (atomic_read(&n->refcnt) > 1) {
+	if (refcount_read(&n->refcnt) > 1) {
 		struct sk_buff *skb;
 
 		pr_debug("destruction postponed with ref %d\n",
-			 atomic_read(&n->refcnt));
+			 refcount_read(&n->refcnt));
 
 		while ((skb = skb_dequeue(&n->arp_queue)) != NULL)
 			dev_kfree_skb(skb);
@@ -381,7 +381,7 @@ static netdev_tx_t clip_start_xmit(struct sk_buff *skb,
 		memcpy(here, llc_oui, sizeof(llc_oui));
 		((__be16 *) here)[3] = skb->protocol;
 	}
-	atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
+	refcount_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
 	ATM_SKB(skb)->atm_options = vcc->atm_options;
 	entry->vccs->last_use = jiffies;
 	pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, vcc, vcc->dev);
@@ -617,7 +617,7 @@ static void atmarpd_close(struct atm_vcc *vcc)
 	module_put(THIS_MODULE);
 }
 
-static struct atmdev_ops atmarpd_dev_ops = {
+static const struct atmdev_ops atmarpd_dev_ops = {
 	.close = atmarpd_close
 };
 
@@ -767,7 +767,7 @@ static void atmarp_info(struct seq_file *seq, struct neighbour *n,
 			seq_printf(seq, "(resolving)\n");
 		else
 			seq_printf(seq, "(expired, ref %d)\n",
-				   atomic_read(&entry->neigh->refcnt));
+				   refcount_read(&entry->neigh->refcnt));
 	} else if (!svc) {
 		seq_printf(seq, "%d.%d.%d\n",
 			   clip_vcc->vcc->dev->number,
diff --git a/net/atm/common.c b/net/atm/common.c
index f06422f4108d..8a4f99114cd2 100644
--- a/net/atm/common.c
+++ b/net/atm/common.c
@@ -80,9 +80,9 @@ static void vcc_sock_destruct(struct sock *sk)
 		printk(KERN_DEBUG "%s: rmem leakage (%d bytes) detected.\n",
 		       __func__, atomic_read(&sk->sk_rmem_alloc));
 
-	if (atomic_read(&sk->sk_wmem_alloc))
+	if (refcount_read(&sk->sk_wmem_alloc))
 		printk(KERN_DEBUG "%s: wmem leakage (%d bytes) detected.\n",
-		       __func__, atomic_read(&sk->sk_wmem_alloc));
+		       __func__, refcount_read(&sk->sk_wmem_alloc));
 }
 
 static void vcc_def_wakeup(struct sock *sk)
@@ -101,7 +101,7 @@ static inline int vcc_writable(struct sock *sk)
 	struct atm_vcc *vcc = atm_sk(sk);
 
 	return (vcc->qos.txtp.max_sdu +
-		atomic_read(&sk->sk_wmem_alloc)) <= sk->sk_sndbuf;
+		refcount_read(&sk->sk_wmem_alloc)) <= sk->sk_sndbuf;
 }
 
 static void vcc_write_space(struct sock *sk)
@@ -156,7 +156,7 @@ int vcc_create(struct net *net, struct socket *sock, int protocol, int family, i
 	memset(&vcc->local, 0, sizeof(struct sockaddr_atmsvc));
 	memset(&vcc->remote, 0, sizeof(struct sockaddr_atmsvc));
 	vcc->qos.txtp.max_sdu = 1 << 16; /* for meta VCs */
-	atomic_set(&sk->sk_wmem_alloc, 1);
+	refcount_set(&sk->sk_wmem_alloc, 1);
 	atomic_set(&sk->sk_rmem_alloc, 0);
 	vcc->push = NULL;
 	vcc->pop = NULL;
@@ -630,7 +630,7 @@ int vcc_sendmsg(struct socket *sock, struct msghdr *m, size_t size)
 		goto out;
 	}
 	pr_debug("%d += %d\n", sk_wmem_alloc_get(sk), skb->truesize);
-	atomic_add(skb->truesize, &sk->sk_wmem_alloc);
+	refcount_add(skb->truesize, &sk->sk_wmem_alloc);
 
 	skb->dev = NULL; /* for paths shared with net_device interfaces */
 	ATM_SKB(skb)->atm_options = vcc->atm_options;
diff --git a/net/atm/common.h b/net/atm/common.h
index 959436b87182..d9d583712a91 100644
--- a/net/atm/common.h
+++ b/net/atm/common.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /* net/atm/common.h - ATM sockets (common part for PVC and SVC) */
 
 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
diff --git a/net/atm/ioctl.c b/net/atm/ioctl.c
index bbd3b639992e..2ff0e5e470e3 100644
--- a/net/atm/ioctl.c
+++ b/net/atm/ioctl.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /* ATM ioctl handling */
 
 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
diff --git a/net/atm/lec.c b/net/atm/lec.c
index 09cfe87f0a44..a3d93a1bb133 100644
--- a/net/atm/lec.c
+++ b/net/atm/lec.c
@@ -101,12 +101,12 @@ static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc);
 /* must be done under lec_arp_lock */
 static inline void lec_arp_hold(struct lec_arp_table *entry)
 {
-	atomic_inc(&entry->usage);
+	refcount_inc(&entry->usage);
 }
 
 static inline void lec_arp_put(struct lec_arp_table *entry)
 {
-	if (atomic_dec_and_test(&entry->usage))
+	if (refcount_dec_and_test(&entry->usage))
 		kfree(entry);
 }
 
@@ -181,7 +181,7 @@ lec_send(struct atm_vcc *vcc, struct sk_buff *skb)
 	ATM_SKB(skb)->vcc = vcc;
 	ATM_SKB(skb)->atm_options = vcc->atm_options;
 
-	atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
+	refcount_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
 	if (vcc->send(vcc, skb) < 0) {
 		dev->stats.tx_dropped++;
 		return;
@@ -345,7 +345,7 @@ static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
 	int i;
 	char *tmp;		/* FIXME */
 
-	atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
+	WARN_ON(refcount_sub_and_test(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc));
 	mesg = (struct atmlec_msg *)skb->data;
 	tmp = skb->data;
 	tmp += sizeof(struct atmlec_msg);
@@ -486,7 +486,7 @@ static void lec_atm_close(struct atm_vcc *vcc)
 	module_put(THIS_MODULE);
 }
 
-static struct atmdev_ops lecdev_ops = {
+static const struct atmdev_ops lecdev_ops = {
 	.close = lec_atm_close,
 	.send = lec_atm_send
 };
@@ -1564,7 +1564,7 @@ static struct lec_arp_table *make_entry(struct lec_priv *priv,
 	to_return->last_used = jiffies;
 	to_return->priv = priv;
 	skb_queue_head_init(&to_return->tx_wait);
-	atomic_set(&to_return->usage, 1);
+	refcount_set(&to_return->usage, 1);
 	return to_return;
 }
 
diff --git a/net/atm/lec.h b/net/atm/lec.h
index 4149db1b7885..be0e2667bd8c 100644
--- a/net/atm/lec.h
+++ b/net/atm/lec.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Lan Emulation client header file
  *
diff --git a/net/atm/lec_arpc.h b/net/atm/lec_arpc.h
index ec67435a40a6..1205d8792d28 100644
--- a/net/atm/lec_arpc.h
+++ b/net/atm/lec_arpc.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Lec arp cache
  *
@@ -47,7 +48,7 @@ struct lec_arp_table {
 					 * the length of the tlvs array
 					 */
 	struct sk_buff_head tx_wait;	/* wait queue for outgoing packets */
-	atomic_t usage;			/* usage count */
+	refcount_t usage;		/* usage count */
 };
 
 /*
diff --git a/net/atm/mpc.c b/net/atm/mpc.c
index a190800572bd..5677147209e8 100644
--- a/net/atm/mpc.c
+++ b/net/atm/mpc.c
@@ -555,7 +555,7 @@ static int send_via_shortcut(struct sk_buff *skb, struct mpoa_client *mpc)
 					sizeof(struct llc_snap_hdr));
 	}
 
-	atomic_add(skb->truesize, &sk_atm(entry->shortcut)->sk_wmem_alloc);
+	refcount_add(skb->truesize, &sk_atm(entry->shortcut)->sk_wmem_alloc);
 	ATM_SKB(skb)->atm_options = entry->shortcut->atm_options;
 	entry->shortcut->send(entry->shortcut, skb);
 	entry->packets_fwded++;
@@ -779,7 +779,7 @@ static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb)
 	netif_rx(new_skb);
 }
 
-static struct atmdev_ops mpc_ops = { /* only send is required */
+static const struct atmdev_ops mpc_ops = { /* only send is required */
 	.close	= mpoad_close,
 	.send	= msg_from_mpoad
 };
@@ -911,7 +911,7 @@ static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb)
 
 	struct mpoa_client *mpc = find_mpc_by_vcc(vcc);
 	struct k_message *mesg = (struct k_message *)skb->data;
-	atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
+	WARN_ON(refcount_sub_and_test(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc));
 
 	if (mpc == NULL) {
 		pr_info("no mpc found\n");
diff --git a/net/atm/mpc.h b/net/atm/mpc.h
index cfc7b745aa91..454abd07651a 100644
--- a/net/atm/mpc.h
+++ b/net/atm/mpc.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #ifndef _MPC_H_
 #define _MPC_H_
 
diff --git a/net/atm/mpoa_caches.c b/net/atm/mpoa_caches.c
index a89fdebeffda..e01450bb32d6 100644
--- a/net/atm/mpoa_caches.c
+++ b/net/atm/mpoa_caches.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 #include <linux/types.h>
 #include <linux/atmmpc.h>
 #include <linux/slab.h>
@@ -40,7 +41,7 @@ static in_cache_entry *in_cache_get(__be32 dst_ip,
 	entry = client->in_cache;
 	while (entry != NULL) {
 		if (entry->ctrl_info.in_dst_ip == dst_ip) {
-			atomic_inc(&entry->use);
+			refcount_inc(&entry->use);
 			read_unlock_bh(&client->ingress_lock);
 			return entry;
 		}
@@ -61,7 +62,7 @@ static in_cache_entry *in_cache_get_with_mask(__be32 dst_ip,
 	entry = client->in_cache;
 	while (entry != NULL) {
 		if ((entry->ctrl_info.in_dst_ip & mask) == (dst_ip & mask)) {
-			atomic_inc(&entry->use);
+			refcount_inc(&entry->use);
 			read_unlock_bh(&client->ingress_lock);
 			return entry;
 		}
@@ -82,7 +83,7 @@ static in_cache_entry *in_cache_get_by_vcc(struct atm_vcc *vcc,
 	entry = client->in_cache;
 	while (entry != NULL) {
 		if (entry->shortcut == vcc) {
-			atomic_inc(&entry->use);
+			refcount_inc(&entry->use);
 			read_unlock_bh(&client->ingress_lock);
 			return entry;
 		}
@@ -105,7 +106,7 @@ static in_cache_entry *in_cache_add_entry(__be32 dst_ip,
 
 	dprintk("adding an ingress entry, ip = %pI4\n", &dst_ip);
 
-	atomic_set(&entry->use, 1);
+	refcount_set(&entry->use, 1);
 	dprintk("new_in_cache_entry: about to lock\n");
 	write_lock_bh(&client->ingress_lock);
 	entry->next = client->in_cache;
@@ -121,7 +122,7 @@ static in_cache_entry *in_cache_add_entry(__be32 dst_ip,
 	entry->count = 1;
 	entry->entry_state = INGRESS_INVALID;
 	entry->ctrl_info.holding_time = HOLDING_TIME_DEFAULT;
-	atomic_inc(&entry->use);
+	refcount_inc(&entry->use);
 
 	write_unlock_bh(&client->ingress_lock);
 	dprintk("new_in_cache_entry: unlocked\n");
@@ -178,7 +179,7 @@ static int cache_hit(in_cache_entry *entry, struct mpoa_client *mpc)
 
 static void in_cache_put(in_cache_entry *entry)
 {
-	if (atomic_dec_and_test(&entry->use)) {
+	if (refcount_dec_and_test(&entry->use)) {
 		memset(entry, 0, sizeof(in_cache_entry));
 		kfree(entry);
 	}
@@ -339,7 +340,7 @@ static eg_cache_entry *eg_cache_get_by_cache_id(__be32 cache_id,
 	entry = mpc->eg_cache;
 	while (entry != NULL) {
 		if (entry->ctrl_info.cache_id == cache_id) {
-			atomic_inc(&entry->use);
+			refcount_inc(&entry->use);
 			read_unlock_irq(&mpc->egress_lock);
 			return entry;
 		}
@@ -360,7 +361,7 @@ static eg_cache_entry *eg_cache_get_by_tag(__be32 tag, struct mpoa_client *mpc)
 	entry = mpc->eg_cache;
 	while (entry != NULL) {
 		if (entry->ctrl_info.tag == tag) {
-			atomic_inc(&entry->use);
+			refcount_inc(&entry->use);
 			read_unlock_irqrestore(&mpc->egress_lock, flags);
 			return entry;
 		}
@@ -382,7 +383,7 @@ static eg_cache_entry *eg_cache_get_by_vcc(struct atm_vcc *vcc,
 	entry = mpc->eg_cache;
 	while (entry != NULL) {
 		if (entry->shortcut == vcc) {
-			atomic_inc(&entry->use);
+			refcount_inc(&entry->use);
 			read_unlock_irqrestore(&mpc->egress_lock, flags);
 			return entry;
 		}
@@ -402,7 +403,7 @@ static eg_cache_entry *eg_cache_get_by_src_ip(__be32 ipaddr,
 	entry = mpc->eg_cache;
 	while (entry != NULL) {
 		if (entry->latest_ip_addr == ipaddr) {
-			atomic_inc(&entry->use);
+			refcount_inc(&entry->use);
 			read_unlock_irq(&mpc->egress_lock);
 			return entry;
 		}
@@ -415,7 +416,7 @@ static eg_cache_entry *eg_cache_get_by_src_ip(__be32 ipaddr,
 
 static void eg_cache_put(eg_cache_entry *entry)
 {
-	if (atomic_dec_and_test(&entry->use)) {
+	if (refcount_dec_and_test(&entry->use)) {
 		memset(entry, 0, sizeof(eg_cache_entry));
 		kfree(entry);
 	}
@@ -468,7 +469,7 @@ static eg_cache_entry *eg_cache_add_entry(struct k_message *msg,
 	dprintk("adding an egress entry, ip = %pI4, this should be our IP\n",
 		&msg->content.eg_info.eg_dst_ip);
 
-	atomic_set(&entry->use, 1);
+	refcount_set(&entry->use, 1);
 	dprintk("new_eg_cache_entry: about to lock\n");
 	write_lock_irq(&client->egress_lock);
 	entry->next = client->eg_cache;
@@ -484,7 +485,7 @@ static eg_cache_entry *eg_cache_add_entry(struct k_message *msg,
 	dprintk("new_eg_cache_entry cache_id %u\n",
 		ntohl(entry->ctrl_info.cache_id));
 	dprintk("mps_ip = %pI4\n", &entry->ctrl_info.mps_ip);
-	atomic_inc(&entry->use);
+	refcount_inc(&entry->use);
 
 	write_unlock_irq(&client->egress_lock);
 	dprintk("new_eg_cache_entry: unlocked\n");
diff --git a/net/atm/mpoa_caches.h b/net/atm/mpoa_caches.h
index 8e5f78cf0be1..6a266669ebf4 100644
--- a/net/atm/mpoa_caches.h
+++ b/net/atm/mpoa_caches.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #ifndef MPOA_CACHES_H
 #define MPOA_CACHES_H
 
@@ -6,6 +7,7 @@
 #include <linux/atm.h>
 #include <linux/atmdev.h>
 #include <linux/atmmpc.h>
+#include <linux/refcount.h>
 
 struct mpoa_client;
 
@@ -25,7 +27,7 @@ typedef struct in_cache_entry {
 	struct   atm_vcc *shortcut;
 	uint8_t  MPS_ctrl_ATM_addr[ATM_ESA_LEN];
 	struct   in_ctrl_info ctrl_info;
-	atomic_t use;
+	refcount_t use;
 } in_cache_entry;
 
 struct in_cache_ops{
@@ -58,7 +60,7 @@ typedef struct eg_cache_entry{
 	uint16_t             entry_state;
 	__be32             latest_ip_addr;    /* The src IP address of the last packet */
 	struct eg_ctrl_info  ctrl_info;
-	atomic_t             use;
+	refcount_t             use;
 } eg_cache_entry;
 
 struct eg_cache_ops{
diff --git a/net/atm/mpoa_proc.c b/net/atm/mpoa_proc.c
index 2df34eb5d65f..8a0c17e1c203 100644
--- a/net/atm/mpoa_proc.c
+++ b/net/atm/mpoa_proc.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
 
 #ifdef CONFIG_PROC_FS
diff --git a/net/atm/pppoatm.c b/net/atm/pppoatm.c
index c4e09846d1de..21d9d341a619 100644
--- a/net/atm/pppoatm.c
+++ b/net/atm/pppoatm.c
@@ -350,7 +350,7 @@ static int pppoatm_send(struct ppp_channel *chan, struct sk_buff *skb)
 		return 1;
 	}
 
-	atomic_add(skb->truesize, &sk_atm(ATM_SKB(skb)->vcc)->sk_wmem_alloc);
+	refcount_add(skb->truesize, &sk_atm(ATM_SKB(skb)->vcc)->sk_wmem_alloc);
 	ATM_SKB(skb)->atm_options = ATM_SKB(skb)->vcc->atm_options;
 	pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n",
 		 skb, ATM_SKB(skb)->vcc, ATM_SKB(skb)->vcc->dev);
diff --git a/net/atm/proc.c b/net/atm/proc.c
index bbb6461a4b7f..642f9272ab95 100644
--- a/net/atm/proc.c
+++ b/net/atm/proc.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /* net/atm/proc.c - ATM /proc interface
  *
  * Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA
@@ -61,7 +62,7 @@ static void atm_dev_info(struct seq_file *seq, const struct atm_dev *dev)
 	add_stats(seq, "0", &dev->stats.aal0);
 	seq_puts(seq, "  ");
 	add_stats(seq, "5", &dev->stats.aal5);
-	seq_printf(seq, "\t[%d]", atomic_read(&dev->refcnt));
+	seq_printf(seq, "\t[%d]", refcount_read(&dev->refcnt));
 	seq_putc(seq, '\n');
 }
 
@@ -211,7 +212,7 @@ static void vcc_info(struct seq_file *seq, struct atm_vcc *vcc)
 		   vcc->flags, sk->sk_err,
 		   sk_wmem_alloc_get(sk), sk->sk_sndbuf,
 		   sk_rmem_alloc_get(sk), sk->sk_rcvbuf,
-		   atomic_read(&sk->sk_refcnt));
+		   refcount_read(&sk->sk_refcnt));
 }
 
 static void svc_info(struct seq_file *seq, struct atm_vcc *vcc)
diff --git a/net/atm/protocols.h b/net/atm/protocols.h
index acdfc856222d..18d4d008bac3 100644
--- a/net/atm/protocols.h
+++ b/net/atm/protocols.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /* net/atm/protocols.h - ATM protocol handler entry points */
 
 /* Written 1995-1997 by Werner Almesberger, EPFL LRC */
diff --git a/net/atm/pvc.c b/net/atm/pvc.c
index 040207ec399f..e1140b3bdcaa 100644
--- a/net/atm/pvc.c
+++ b/net/atm/pvc.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /* net/atm/pvc.c - ATM PVC sockets */
 
 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
diff --git a/net/atm/raw.c b/net/atm/raw.c
index 2e17e97a7a8b..ee10e8d46185 100644
--- a/net/atm/raw.c
+++ b/net/atm/raw.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /* net/atm/raw.c - Raw AAL0 and AAL5 transports */
 
 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
@@ -35,7 +36,7 @@ static void atm_pop_raw(struct atm_vcc *vcc, struct sk_buff *skb)
 
 	pr_debug("(%d) %d -= %d\n",
 		 vcc->vci, sk_wmem_alloc_get(sk), skb->truesize);
-	atomic_sub(skb->truesize, &sk->sk_wmem_alloc);
+	WARN_ON(refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc));
 	dev_kfree_skb_any(skb);
 	sk->sk_write_space(sk);
 }
diff --git a/net/atm/resources.c b/net/atm/resources.c
index 0447d5d0b639..bada395ecdb1 100644
--- a/net/atm/resources.c
+++ b/net/atm/resources.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /* net/atm/resources.c - Statically allocated resources */
 
 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
@@ -109,7 +110,7 @@ struct atm_dev *atm_dev_register(const char *type, struct device *parent,
 	else
 		memset(&dev->flags, 0, sizeof(dev->flags));
 	memset(&dev->stats, 0, sizeof(dev->stats));
-	atomic_set(&dev->refcnt, 1);
+	refcount_set(&dev->refcnt, 1);
 
 	if (atm_proc_dev_register(dev) < 0) {
 		pr_err("atm_proc_dev_register failed for dev %s\n", type);
diff --git a/net/atm/resources.h b/net/atm/resources.h
index 521431e30507..048232e4d4c6 100644
--- a/net/atm/resources.h
+++ b/net/atm/resources.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /* net/atm/resources.h - ATM-related resources */
 
 /* Written 1995-1998 by Werner Almesberger, EPFL LRC/ICA */
diff --git a/net/atm/signaling.c b/net/atm/signaling.c
index adb6e3d21b1e..6c11cdf4dd4c 100644
--- a/net/atm/signaling.c
+++ b/net/atm/signaling.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /* net/atm/signaling.c - ATM signaling */
 
 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
@@ -67,7 +68,7 @@ static int sigd_send(struct atm_vcc *vcc, struct sk_buff *skb)
 	struct sock *sk;
 
 	msg = (struct atmsvc_msg *) skb->data;
-	atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
+	WARN_ON(refcount_sub_and_test(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc));
 	vcc = *(struct atm_vcc **) &msg->vcc;
 	pr_debug("%d (0x%lx)\n", (int)msg->type, (unsigned long)vcc);
 	sk = sk_atm(vcc);
@@ -150,8 +151,7 @@ void sigd_enq2(struct atm_vcc *vcc, enum atmsvc_msg_type type,
 	pr_debug("%d (0x%p)\n", (int)type, vcc);
 	while (!(skb = alloc_skb(sizeof(struct atmsvc_msg), GFP_KERNEL)))
 		schedule();
-	msg = (struct atmsvc_msg *)skb_put(skb, sizeof(struct atmsvc_msg));
-	memset(msg, 0, sizeof(*msg));
+	msg = skb_put_zero(skb, sizeof(struct atmsvc_msg));
 	msg->type = type;
 	*(struct atm_vcc **) &msg->vcc = vcc;
 	*(struct atm_vcc **) &msg->listen_vcc = listen_vcc;
@@ -218,7 +218,7 @@ static void sigd_close(struct atm_vcc *vcc)
 	read_unlock(&vcc_sklist_lock);
 }
 
-static struct atmdev_ops sigd_dev_ops = {
+static const struct atmdev_ops sigd_dev_ops = {
 	.close = sigd_close,
 	.send =	sigd_send
 };
diff --git a/net/atm/signaling.h b/net/atm/signaling.h
index 08b2a69cc572..2df8220f7ab5 100644
--- a/net/atm/signaling.h
+++ b/net/atm/signaling.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /* net/atm/signaling.h - ATM signaling */
 
 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
diff --git a/net/atm/svc.c b/net/atm/svc.c
index 5589de7086af..c458adcbc177 100644
--- a/net/atm/svc.c
+++ b/net/atm/svc.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /* net/atm/svc.c - ATM SVC sockets */
 
 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */