s390/qeth: Convert sysfs sprintf to sysfs_emit

Following the advice of the Documentation/filesystems/sysfs.rst.
All sysfs related show()-functions should only use sysfs_emit() or
sysfs_emit_at() when formatting the value to be returned to user space.

Reported-by: Jules Irenge <[e-mail]>
Reported-by: Joe Perches <[e-mail]>
Reviewed-by: Alexandra Winter <[e-mail]>
Signed-off-by: Thorsten Winkler <[e-mail]>
Signed-off-by: Alexandra Winter <[e-mail]>
Reviewed-by: Simon Horman <[e-mail]>
Signed-off-by: Jakub Kicinski <[e-mail]>

drivers/s390/net/qeth_core_sys.c

···
 
 	switch (card->state) {
 	case CARD_STATE_DOWN:
-		return sprintf(buf, "DOWN\n");
+		return sysfs_emit(buf, "DOWN\n");
 	case CARD_STATE_SOFTSETUP:
 		if (card->dev->flags & IFF_UP)
-			return sprintf(buf, "UP (LAN %s)\n",
-				       netif_carrier_ok(card->dev) ? "ONLINE" :
-								     "OFFLINE");
-		return sprintf(buf, "SOFTSETUP\n");
+			return sysfs_emit(buf, "UP (LAN %s)\n",
+					  netif_carrier_ok(card->dev) ?
+					  "ONLINE" : "OFFLINE");
+		return sysfs_emit(buf, "SOFTSETUP\n");
 	default:
-		return sprintf(buf, "UNKNOWN\n");
+		return sysfs_emit(buf, "UNKNOWN\n");
 	}
 }
 
···
 {
 	struct qeth_card *card = dev_get_drvdata(dev);
 
-	return sprintf(buf, "%02X\n", card->info.chpid);
+	return sysfs_emit(buf, "%02X\n", card->info.chpid);
 }
 
 static DEVICE_ATTR(chpid, 0444, qeth_dev_chpid_show, NULL);
···
 {
 	struct qeth_card *card = dev_get_drvdata(dev);
 
-	return sprintf(buf, "%s\n", netdev_name(card->dev));
+	return sysfs_emit(buf, "%s\n", netdev_name(card->dev));
 }
 
 static DEVICE_ATTR(if_name, 0444, qeth_dev_if_name_show, NULL);
···
 {
 	struct qeth_card *card = dev_get_drvdata(dev);
 
-	return sprintf(buf, "%s\n", qeth_get_cardname_short(card));
+	return sysfs_emit(buf, "%s\n", qeth_get_cardname_short(card));
 }
 
 static DEVICE_ATTR(card_type, 0444, qeth_dev_card_type_show, NULL);
···
 {
 	struct qeth_card *card = dev_get_drvdata(dev);
 
-	return sprintf(buf, "%s\n", qeth_get_bufsize_str(card));
+	return sysfs_emit(buf, "%s\n", qeth_get_bufsize_str(card));
 }
 
 static DEVICE_ATTR(inbuf_size, 0444, qeth_dev_inbuf_size_show, NULL);
···
 {
 	struct qeth_card *card = dev_get_drvdata(dev);
 
-	return sprintf(buf, "%i\n", card->dev->dev_port);
+	return sysfs_emit(buf, "%i\n", card->dev->dev_port);
 }
 
 static ssize_t qeth_dev_portno_store(struct device *dev,
···
 static ssize_t qeth_dev_portname_show(struct device *dev,
 				struct device_attribute *attr, char *buf)
 {
-	return sprintf(buf, "no portname required\n");
+	return sysfs_emit(buf, "no portname required\n");
 }
 
 static ssize_t qeth_dev_portname_store(struct device *dev,
···
 
 	switch (card->qdio.do_prio_queueing) {
 	case QETH_PRIO_Q_ING_PREC:
-		return sprintf(buf, "%s\n", "by precedence");
+		return sysfs_emit(buf, "%s\n", "by precedence");
 	case QETH_PRIO_Q_ING_TOS:
-		return sprintf(buf, "%s\n", "by type of service");
+		return sysfs_emit(buf, "%s\n", "by type of service");
 	case QETH_PRIO_Q_ING_SKB:
-		return sprintf(buf, "%s\n", "by skb-priority");
+		return sysfs_emit(buf, "%s\n", "by skb-priority");
 	case QETH_PRIO_Q_ING_VLAN:
-		return sprintf(buf, "%s\n", "by VLAN headers");
+		return sysfs_emit(buf, "%s\n", "by VLAN headers");
 	case QETH_PRIO_Q_ING_FIXED:
-		return sprintf(buf, "always queue %i\n",
+		return sysfs_emit(buf, "always queue %i\n",
 			       card->qdio.default_out_queue);
 	default:
-		return sprintf(buf, "disabled\n");
+		return sysfs_emit(buf, "disabled\n");
 	}
 }
 
···
 {
 	struct qeth_card *card = dev_get_drvdata(dev);
 
-	return sprintf(buf, "%i\n", card->qdio.in_buf_pool.buf_count);
+	return sysfs_emit(buf, "%i\n", card->qdio.in_buf_pool.buf_count);
 }
 
 static ssize_t qeth_dev_bufcnt_store(struct device *dev,
···
 static ssize_t qeth_dev_performance_stats_show(struct device *dev,
 				struct device_attribute *attr, char *buf)
 {
-	return sprintf(buf, "1\n");
+	return sysfs_emit(buf, "1\n");
 }
 
 static ssize_t qeth_dev_performance_stats_store(struct device *dev,
···
 {
 	struct qeth_card *card = dev_get_drvdata(dev);
 
-	return sprintf(buf, "%i\n", card->options.layer);
+	return sysfs_emit(buf, "%i\n", card->options.layer);
 }
 
 static ssize_t qeth_dev_layer2_store(struct device *dev,
···
 	int	rc = 0;
 
 	if (!qeth_card_hw_is_reachable(card))
-		return sprintf(buf, "n/a\n");
+		return sysfs_emit(buf, "n/a\n");
 
 	rc = qeth_query_switch_attributes(card, &sw_info);
 	if (rc)
 		return rc;
 
 	if (!sw_info.capabilities)
-		rc = sprintf(buf, "unknown");
+		rc = sysfs_emit(buf, "unknown");
 
 	if (sw_info.capabilities & QETH_SWITCH_FORW_802_1)
-		rc = sprintf(buf, (sw_info.settings & QETH_SWITCH_FORW_802_1 ?
-							"[802.1]" : "802.1"));
+		rc = sysfs_emit(buf,
+				(sw_info.settings & QETH_SWITCH_FORW_802_1 ?
+				"[802.1]" : "802.1"));
 	if (sw_info.capabilities & QETH_SWITCH_FORW_REFL_RELAY)
-		rc += sprintf(buf + rc,
-			(sw_info.settings & QETH_SWITCH_FORW_REFL_RELAY ?
-							" [rr]" : " rr"));
-	rc += sprintf(buf + rc, "\n");
+		rc += sysfs_emit_at(buf, rc,
+				    (sw_info.settings &
+				    QETH_SWITCH_FORW_REFL_RELAY ?
+				    " [rr]" : " rr"));
+	rc += sysfs_emit_at(buf, rc, "\n");
 
 	return rc;
 }
···
 {
 	struct qeth_card *card = dev_get_drvdata(dev);
 
-	return sprintf(buf, "%i\n", card->info.blkt.time_total);
+	return sysfs_emit(buf, "%i\n", card->info.blkt.time_total);
 }
 
 static ssize_t qeth_dev_blkt_total_store(struct device *dev,
···
 {
 	struct qeth_card *card = dev_get_drvdata(dev);
 
-	return sprintf(buf, "%i\n", card->info.blkt.inter_packet);
+	return sysfs_emit(buf, "%i\n", card->info.blkt.inter_packet);
 }
 
 static ssize_t qeth_dev_blkt_inter_store(struct device *dev,
···
 {
 	struct qeth_card *card = dev_get_drvdata(dev);
 
-	return sprintf(buf, "%i\n", card->info.blkt.inter_packet_jumbo);
+	return sysfs_emit(buf, "%i\n", card->info.blkt.inter_packet_jumbo);
 }
 
 static ssize_t qeth_dev_blkt_inter_jumbo_store(struct device *dev,

drivers/s390/net/qeth_l2_sys.c

···
 	char *word;
 
 	if (!qeth_bridgeport_allowed(card))
-		return sprintf(buf, "n/a (VNIC characteristics)\n");
+		return sysfs_emit(buf, "n/a (VNIC characteristics)\n");
 
 	mutex_lock(&card->sbp_lock);
 	if (qeth_card_hw_is_reachable(card) &&
···
 			QETH_CARD_TEXT_(card, 2, "SBP%02x:%02x",
 				card->options.sbp.role, state);
 		else
-			rc = sprintf(buf, "%s\n", word);
+			rc = sysfs_emit(buf, "%s\n", word);
 	}
 	mutex_unlock(&card->sbp_lock);
 
···
 	struct qeth_card *card = dev_get_drvdata(dev);
 
 	if (!qeth_bridgeport_allowed(card))
-		return sprintf(buf, "n/a (VNIC characteristics)\n");
+		return sysfs_emit(buf, "n/a (VNIC characteristics)\n");
 
 	return qeth_bridge_port_role_state_show(dev, attr, buf, 0);
 }
···
 	struct qeth_card *card = dev_get_drvdata(dev);
 
 	if (!qeth_bridgeport_allowed(card))
-		return sprintf(buf, "n/a (VNIC characteristics)\n");
+		return sysfs_emit(buf, "n/a (VNIC characteristics)\n");
 
 	return qeth_bridge_port_role_state_show(dev, attr, buf, 1);
 }
···
 	int enabled;
 
 	if (!qeth_bridgeport_allowed(card))
-		return sprintf(buf, "n/a (VNIC characteristics)\n");
+		return sysfs_emit(buf, "n/a (VNIC characteristics)\n");
 
 	enabled = card->options.sbp.hostnotification;
 
-	return sprintf(buf, "%d\n", enabled);
+	return sysfs_emit(buf, "%d\n", enabled);
 }
 
 static ssize_t qeth_bridgeport_hostnotification_store(struct device *dev,
···
 	char *state;
 
 	if (!qeth_bridgeport_allowed(card))
-		return sprintf(buf, "n/a (VNIC characteristics)\n");
+		return sysfs_emit(buf, "n/a (VNIC characteristics)\n");
 
 	if (card->options.sbp.reflect_promisc) {
 		if (card->options.sbp.reflect_promisc_primary)
···
 	} else
 		state = "none";
 
-	return sprintf(buf, "%s\n", state);
+	return sysfs_emit(buf, "%s\n", state);
 }
 
 static ssize_t qeth_bridgeport_reflect_store(struct device *dev,
···
 
 	rc = qeth_l2_vnicc_get_timeout(card, &timeout);
 	if (rc == -EBUSY)
-		return sprintf(buf, "n/a (BridgePort)\n");
+		return sysfs_emit(buf, "n/a (BridgePort)\n");
 	if (rc == -EOPNOTSUPP)
-		return sprintf(buf, "n/a\n");
-	return rc ? rc : sprintf(buf, "%d\n", timeout);
+		return sysfs_emit(buf, "n/a\n");
+	return rc ? rc : sysfs_emit(buf, "%d\n", timeout);
 }
 
 /* change timeout setting */
···
 	rc = qeth_l2_vnicc_get_state(card, vnicc, &state);
 
 	if (rc == -EBUSY)
-		return sprintf(buf, "n/a (BridgePort)\n");
+		return sysfs_emit(buf, "n/a (BridgePort)\n");
 	if (rc == -EOPNOTSUPP)
-		return sprintf(buf, "n/a\n");
-	return rc ? rc : sprintf(buf, "%d\n", state);
+		return sysfs_emit(buf, "n/a\n");
+	return rc ? rc : sysfs_emit(buf, "%d\n", state);
 }
 
 /* change setting of characteristic */

drivers/s390/net/qeth_l3_sys.c

···
 {
 	switch (route->type) {
 	case PRIMARY_ROUTER:
-		return sprintf(buf, "%s\n", "primary router");
+		return sysfs_emit(buf, "%s\n", "primary router");
 	case SECONDARY_ROUTER:
-		return sprintf(buf, "%s\n", "secondary router");
+		return sysfs_emit(buf, "%s\n", "secondary router");
 	case MULTICAST_ROUTER:
 		if (card->info.broadcast_capable == QETH_BROADCAST_WITHOUT_ECHO)
-			return sprintf(buf, "%s\n", "multicast router+");
+			return sysfs_emit(buf, "%s\n", "multicast router+");
 		else
-			return sprintf(buf, "%s\n", "multicast router");
+			return sysfs_emit(buf, "%s\n", "multicast router");
 	case PRIMARY_CONNECTOR:
 		if (card->info.broadcast_capable == QETH_BROADCAST_WITHOUT_ECHO)
-			return sprintf(buf, "%s\n", "primary connector+");
+			return sysfs_emit(buf, "%s\n", "primary connector+");
 		else
-			return sprintf(buf, "%s\n", "primary connector");
+			return sysfs_emit(buf, "%s\n", "primary connector");
 	case SECONDARY_CONNECTOR:
 		if (card->info.broadcast_capable == QETH_BROADCAST_WITHOUT_ECHO)
-			return sprintf(buf, "%s\n", "secondary connector+");
+			return sysfs_emit(buf, "%s\n", "secondary connector+");
 		else
-			return sprintf(buf, "%s\n", "secondary connector");
+			return sysfs_emit(buf, "%s\n", "secondary connector");
 	default:
-		return sprintf(buf, "%s\n", "no");
+		return sysfs_emit(buf, "%s\n", "no");
 	}
 }
 
···
 {
 	struct qeth_card *card = dev_get_drvdata(dev);
 
-	return sprintf(buf, "%i\n", card->options.sniffer ? 1 : 0);
+	return sysfs_emit(buf, "%i\n", card->options.sniffer ? 1 : 0);
 }
 
 static ssize_t qeth_l3_dev_sniffer_store(struct device *dev,
···
 
 	memcpy(tmp_hsuid, card->options.hsuid, sizeof(tmp_hsuid));
 	EBCASC(tmp_hsuid, 8);
-	return sprintf(buf, "%s\n", tmp_hsuid);
+	return sysfs_emit(buf, "%s\n", tmp_hsuid);
 }
 
 static ssize_t qeth_l3_dev_hsuid_store(struct device *dev,
···
 {
 	struct qeth_card *card = dev_get_drvdata(dev);
 
-	return sprintf(buf, "%u\n", card->ipato.enabled ? 1 : 0);
+	return sysfs_emit(buf, "%u\n", card->ipato.enabled ? 1 : 0);
 }
 
 static ssize_t qeth_l3_dev_ipato_enable_store(struct device *dev,
···
 {
 	struct qeth_card *card = dev_get_drvdata(dev);
 
-	return sprintf(buf, "%u\n", card->ipato.invert4 ? 1 : 0);
+	return sysfs_emit(buf, "%u\n", card->ipato.invert4 ? 1 : 0);
 }
 
 static ssize_t qeth_l3_dev_ipato_invert4_store(struct device *dev,
···
 			enum qeth_prot_versions proto)
 {
 	struct qeth_ipato_entry *ipatoe;
-	int str_len = 0;
+	char addr_str[INET6_ADDRSTRLEN];
+	int offset = 0;
 
 	mutex_lock(&card->ip_lock);
 	list_for_each_entry(ipatoe, &card->ipato.entries, entry) {
-		char addr_str[INET6_ADDRSTRLEN];
-		int entry_len;
-
 		if (ipatoe->proto != proto)
 			continue;
 
-		entry_len = qeth_l3_ipaddr_to_string(proto, ipatoe->addr,
-						     addr_str);
-		if (entry_len < 0)
-			continue;
-
-		/* Append /%mask to the entry: */
-		entry_len += 1 + ((proto == QETH_PROT_IPV4) ? 2 : 3);
-		/* Enough room to format %entry\n into null terminated page? */
-		if (entry_len + 1 > PAGE_SIZE - str_len - 1)
-			break;
-
-		entry_len = scnprintf(buf, PAGE_SIZE - str_len,
-				      "%s/%i\n", addr_str, ipatoe->mask_bits);
-		str_len += entry_len;
-		buf += entry_len;
+		qeth_l3_ipaddr_to_string(proto, ipatoe->addr, addr_str);
+		offset += sysfs_emit_at(buf, offset, "%s/%i\n",
+					addr_str, ipatoe->mask_bits);
 	}
 	mutex_unlock(&card->ip_lock);
 
-	return str_len ? str_len : scnprintf(buf, PAGE_SIZE, "\n");
+	return offset ? offset : sysfs_emit(buf, "\n");
 }
 
 static ssize_t qeth_l3_dev_ipato_add4_show(struct device *dev,
···
 {
 	struct qeth_card *card = dev_get_drvdata(dev);
 
-	return sprintf(buf, "%u\n", card->ipato.invert6 ? 1 : 0);
+	return sysfs_emit(buf, "%u\n", card->ipato.invert6 ? 1 : 0);
 }
 
 static ssize_t qeth_l3_dev_ipato_invert6_store(struct device *dev,
···
 				       enum qeth_ip_types type)
 {
 	struct qeth_card *card = dev_get_drvdata(dev);
+	char addr_str[INET6_ADDRSTRLEN];
 	struct qeth_ipaddr *ipaddr;
-	int str_len = 0;
+	int offset = 0;
 	int i;
 
 	mutex_lock(&card->ip_lock);
 	hash_for_each(card->ip_htable, i, ipaddr, hnode) {
-		char addr_str[INET6_ADDRSTRLEN];
-		int entry_len;
-
 		if (ipaddr->proto != proto || ipaddr->type != type)
 			continue;
 
-		entry_len = qeth_l3_ipaddr_to_string(proto, (u8 *)&ipaddr->u,
-						     addr_str);
-		if (entry_len < 0)
-			continue;
-
-		/* Enough room to format %addr\n into null terminated page? */
-		if (entry_len + 1 > PAGE_SIZE - str_len - 1)
-			break;
-
-		entry_len = scnprintf(buf, PAGE_SIZE - str_len, "%s\n",
-				      addr_str);
-		str_len += entry_len;
-		buf += entry_len;
+		qeth_l3_ipaddr_to_string(proto, (u8 *)&ipaddr->u, addr_str);
+		offset += sysfs_emit_at(buf, offset, "%s\n", addr_str);
 	}
 	mutex_unlock(&card->ip_lock);
 
-	return str_len ? str_len : scnprintf(buf, PAGE_SIZE, "\n");
+	return offset ? offset : sysfs_emit(buf, "\n");
 }
 
 static ssize_t qeth_l3_dev_vipa_add4_show(struct device *dev,