diff mbox series

[net-next,3/4] s390/qeth: Convert sysfs sprintf to sysfs_emit

Message ID 20230206172754.980062-4-wintera@linux.ibm.com (mailing list archive)
State Superseded
Delegated to: Netdev Maintainers
Headers show
Series s390/net: updates 2023-02-06 | expand

Checks

Context Check Description
netdev/tree_selection success Clearly marked for net-next
netdev/fixes_present success Fixes tag not required for -next series
netdev/subject_prefix success Link
netdev/cover_letter success Series has a cover letter
netdev/patch_count success Link
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 0 this patch: 0
netdev/cc_maintainers warning 5 maintainers not CCed: borntraeger@linux.ibm.com gor@linux.ibm.com agordeev@linux.ibm.com wenjia@linux.ibm.com svens@linux.ibm.com
netdev/build_clang success Errors and warnings before: 0 this patch: 0
netdev/module_param success Was 0 now: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 0 this patch: 0
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 369 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Alexandra Winter Feb. 6, 2023, 5:27 p.m. UTC 
From: Thorsten Winkler <twinkler@linux.ibm.com>

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 <jbi.octave@gmail.com>
Reported-by: Joe Perches <joe@perches.com>
Reviewed-by: Alexandra Winkler <wintera@linux.ibm.com>
Signed-off-by: Thorsten Winkler <twinkler@linux.ibm.com>
Signed-off-by: Alexandra Winter <wintera@linux.ibm.com>
---
 drivers/s390/net/qeth_core_sys.c | 66 ++++++++++++++++----------------
 drivers/s390/net/qeth_l2_sys.c   | 28 +++++++-------
 drivers/s390/net/qeth_l3_sys.c   | 41 +++++++++-----------
 3 files changed, 67 insertions(+), 68 deletions(-)

Comments

Simon Horman Feb. 7, 2023, 3:37 p.m. UTC | #1 
On Mon, Feb 06, 2023 at 06:27:53PM +0100, Alexandra Winter wrote:
> From: Thorsten Winkler <twinkler@linux.ibm.com>
> 
> 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 <jbi.octave@gmail.com>
> Reported-by: Joe Perches <joe@perches.com>
> Reviewed-by: Alexandra Winkler <wintera@linux.ibm.com>

s/Winkler/Winter/ ?

> Signed-off-by: Thorsten Winkler <twinkler@linux.ibm.com>
> Signed-off-by: Alexandra Winter <wintera@linux.ibm.com>

Code changes look good to me.
Joe Perches Feb. 7, 2023, 4:06 p.m. UTC | #2 
On Mon, 2023-02-06 at 18:27 +0100, Alexandra Winter wrote:
> From: Thorsten Winkler <twinkler@linux.ibm.com>
> 
> 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.
[]
> diff --git a/drivers/s390/net/qeth_l3_sys.c b/drivers/s390/net/qeth_l3_sys.c
[]
> @@ -607,14 +606,12 @@ static ssize_t qeth_l3_dev_ip_add_show(struct device *dev, char *buf,
>  		if (entry_len + 1 > PAGE_SIZE - str_len - 1)
>  			break;
>  
> -		entry_len = scnprintf(buf, PAGE_SIZE - str_len, "%s\n",
> -				      addr_str);
> +		entry_len = sysfs_emit_at(buf, str_len, "%s\n", addr_str);
>  		str_len += entry_len;
> -		buf += entry_len;
>  	}
>  	mutex_unlock(&card->ip_lock);
>  
> -	return str_len ? str_len : scnprintf(buf, PAGE_SIZE, "\n");
> +	return str_len ? str_len : sysfs_emit(buf, "\n");
>  }
>  
>  static ssize_t qeth_l3_dev_vipa_add4_show(struct device *dev,

One of the intended uses of sysfs_emit is to not require the
knowlege of buf as PAGE_SIZE so it could possibly be
extended/changed.

So perhaps the use of entry_len is useless and the PAGE_SIZE use
above should be removed.

The below though could emit a partial line, dunno if that's a
good thing or not but sysfs is not supposed to emit multiple
lines anyway.
---
diff --git a/drivers/s390/net/qeth_l3_sys.c b/drivers/s390/net/qeth_l3_sys.c
index 1082380b21f85..a2a332f29f5c4 100644
--- a/drivers/s390/net/qeth_l3_sys.c
+++ b/drivers/s390/net/qeth_l3_sys.c
@@ -367,35 +367,24 @@ static ssize_t qeth_l3_dev_ipato_add_show(char *buf, struct qeth_card *card,
 			enum qeth_prot_versions proto)
 {
 	struct qeth_ipato_entry *ipatoe;
-	int str_len = 0;
+	int len = 0;
 
 	mutex_lock(&card->ip_lock);
 	list_for_each_entry(ipatoe, &card->ipato.entries, entry) {
 		char addr_str[40];
-		int entry_len;
 
 		if (ipatoe->proto != proto)
 			continue;
 
-		entry_len = qeth_l3_ipaddr_to_string(proto, ipatoe->addr,
-						     addr_str);
-		if (entry_len < 0)
+		if (qeth_l3_ipaddr_to_string(proto, ipatoe->addr, addr_str) < 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;
+		len += sysfs_emit_at(buf, len, "%s/%i\n",
+				     addr_str, ipatoe->mask_bits);
 	}
 	mutex_unlock(&card->ip_lock);
 
-	return str_len ? str_len : scnprintf(buf, PAGE_SIZE, "\n");
+	return len ?: sysfs_emit(buf, "\n");
 }
 
 static ssize_t qeth_l3_dev_ipato_add4_show(struct device *dev,
Alexandra Winter Feb. 8, 2023, 6:30 p.m. UTC | #3 
On 07.02.23 17:06, Joe Perches wrote:
> On Mon, 2023-02-06 at 18:27 +0100, Alexandra Winter wrote:
>> From: Thorsten Winkler <twinkler@linux.ibm.com>
...
> 
> One of the intended uses of sysfs_emit is to not require the
> knowlege of buf as PAGE_SIZE so it could possibly be
> extended/changed.
> 
> So perhaps the use of entry_len is useless and the PAGE_SIZE use
> above should be removed.
> 

Thanks a lot for pointing that out. Will send a v2 tomorrow.

> The below though could emit a partial line, dunno if that's a
> good thing or not but sysfs is not supposed to emit multiple
> lines anyway.

Agree, this may not be the best usage of sysfs.
But we don't want to change existing behaviour with this patch.
diff mbox series

Patch

diff --git a/drivers/s390/net/qeth_core_sys.c b/drivers/s390/net/qeth_core_sys.c
index d1adc4b83193..eea93f8f106f 100644
--- a/drivers/s390/net/qeth_core_sys.c
+++ b/drivers/s390/net/qeth_core_sys.c
@@ -23,15 +23,15 @@  static ssize_t qeth_dev_state_show(struct device *dev,
 
 	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");
 	}
 }
 
@@ -42,7 +42,7 @@  static ssize_t qeth_dev_chpid_show(struct device *dev,
 {
 	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);
@@ -52,7 +52,7 @@  static ssize_t qeth_dev_if_name_show(struct device *dev,
 {
 	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);
@@ -62,7 +62,7 @@  static ssize_t qeth_dev_card_type_show(struct device *dev,
 {
 	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);
@@ -86,7 +86,7 @@  static ssize_t qeth_dev_inbuf_size_show(struct device *dev,
 {
 	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);
@@ -96,7 +96,7 @@  static ssize_t qeth_dev_portno_show(struct device *dev,
 {
 	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,
@@ -134,7 +134,7 @@  static DEVICE_ATTR(portno, 0644, qeth_dev_portno_show, qeth_dev_portno_store);
 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,
@@ -157,18 +157,18 @@  static ssize_t qeth_dev_prioqing_show(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");
 	}
 }
 
@@ -242,7 +242,7 @@  static ssize_t qeth_dev_bufcnt_show(struct device *dev,
 {
 	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,
@@ -298,7 +298,7 @@  static DEVICE_ATTR(recover, 0200, NULL, qeth_dev_recover_store);
 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,
@@ -335,7 +335,7 @@  static ssize_t qeth_dev_layer2_show(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,
@@ -470,23 +470,25 @@  static ssize_t qeth_dev_switch_attrs_show(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;
 }
@@ -573,7 +575,7 @@  static ssize_t qeth_dev_blkt_total_show(struct device *dev,
 {
 	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,
@@ -593,7 +595,7 @@  static ssize_t qeth_dev_blkt_inter_show(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,
@@ -613,7 +615,7 @@  static ssize_t qeth_dev_blkt_inter_jumbo_show(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,
diff --git a/drivers/s390/net/qeth_l2_sys.c b/drivers/s390/net/qeth_l2_sys.c
index a617351fff57..7f592f912517 100644
--- a/drivers/s390/net/qeth_l2_sys.c
+++ b/drivers/s390/net/qeth_l2_sys.c
@@ -19,7 +19,7 @@  static ssize_t qeth_bridge_port_role_state_show(struct device *dev,
 	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) &&
@@ -53,7 +53,7 @@  static ssize_t qeth_bridge_port_role_state_show(struct device *dev,
 			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);
 
@@ -66,7 +66,7 @@  static ssize_t qeth_bridge_port_role_show(struct device *dev,
 	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);
 }
@@ -117,7 +117,7 @@  static ssize_t qeth_bridge_port_state_show(struct device *dev,
 	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);
 }
@@ -132,11 +132,11 @@  static ssize_t qeth_bridgeport_hostnotification_show(struct device *dev,
 	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,
@@ -180,7 +180,7 @@  static ssize_t qeth_bridgeport_reflect_show(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)
@@ -190,7 +190,7 @@  static ssize_t qeth_bridgeport_reflect_show(struct device *dev,
 	} 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,
@@ -280,10 +280,10 @@  static ssize_t qeth_vnicc_timeout_show(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 */
@@ -318,10 +318,10 @@  static ssize_t qeth_vnicc_char_show(struct device *dev,
 	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 */
diff --git a/drivers/s390/net/qeth_l3_sys.c b/drivers/s390/net/qeth_l3_sys.c
index 6143dd485810..f0f8adaa2f05 100644
--- a/drivers/s390/net/qeth_l3_sys.c
+++ b/drivers/s390/net/qeth_l3_sys.c
@@ -32,26 +32,26 @@  static ssize_t qeth_l3_dev_route_show(struct qeth_card *card,
 {
 	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");
 	}
 }
 
@@ -138,7 +138,7 @@  static ssize_t qeth_l3_dev_sniffer_show(struct device *dev,
 {
 	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,
@@ -200,7 +200,7 @@  static ssize_t qeth_l3_dev_hsuid_show(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,
@@ -285,7 +285,7 @@  static ssize_t qeth_l3_dev_ipato_enable_show(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,
@@ -330,7 +330,7 @@  static ssize_t qeth_l3_dev_ipato_invert4_show(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,
@@ -388,14 +388,13 @@  static ssize_t qeth_l3_dev_ipato_add_show(char *buf, struct qeth_card *card,
 		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);
+		entry_len = sysfs_emit_at(buf, str_len, "%s/%i\n",
+					  addr_str, ipatoe->mask_bits);
 		str_len += entry_len;
-		buf += entry_len;
 	}
 	mutex_unlock(&card->ip_lock);
 
-	return str_len ? str_len : scnprintf(buf, PAGE_SIZE, "\n");
+	return str_len ? str_len : sysfs_emit(buf, "\n");
 }
 
 static ssize_t qeth_l3_dev_ipato_add4_show(struct device *dev,
@@ -501,7 +500,7 @@  static ssize_t qeth_l3_dev_ipato_invert6_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,
@@ -607,14 +606,12 @@  static ssize_t qeth_l3_dev_ip_add_show(struct device *dev, char *buf,
 		if (entry_len + 1 > PAGE_SIZE - str_len - 1)
 			break;
 
-		entry_len = scnprintf(buf, PAGE_SIZE - str_len, "%s\n",
-				      addr_str);
+		entry_len = sysfs_emit_at(buf, str_len, "%s\n", addr_str);
 		str_len += entry_len;
-		buf += entry_len;
 	}
 	mutex_unlock(&card->ip_lock);
 
-	return str_len ? str_len : scnprintf(buf, PAGE_SIZE, "\n");
+	return str_len ? str_len : sysfs_emit(buf, "\n");
 }
 
 static ssize_t qeth_l3_dev_vipa_add4_show(struct device *dev,