Merge branch 'ethtool_puts'

Justin Stitt says:

====================
ethtool: Add ethtool_puts()

This series aims to implement ethtool_puts() and send out a wave 1 of
conversions from ethtool_sprintf(). There's also a checkpatch patch
included to check for the cases listed below.

This was sparked from recent discussion here [1]

The conversions are used in cases where ethtool_sprintf() was being used
with just two arguments:
|       ethtool_sprintf(&data, buffer[i].name);
or when it's used with format string: "%s"
|       ethtool_sprintf(&data, "%s", buffer[i].name);
which both now become:
|       ethtool_puts(&data, buffer[i].name);

The first case commonly triggers a -Wformat-security warning with Clang
due to potential problems with format flags present in the strings [3].

The second is just a bit weird with a plain-ol' "%s".

Changes found with Cocci [4] and grep [5].

[1]: https://lore.kernel.org/all/202310141935.B326C9E@keescook/
[2]: https://lore.kernel.org/all/?q=dfb%3Aethtool_sprintf+AND+f%3Ajustinstitt
[3]: https://lore.kernel.org/all/202310101528.9496539BE@keescook/
[4]: (script authored by Kees w/ modifications from Joe)
@replace_2_args@
expression BUF;
expression VAR;
@@

-       ethtool_sprintf(BUF, VAR)
+       ethtool_puts(BUF, VAR)

@replace_3_args@
expression BUF;
expression VAR;
@@

-       ethtool_sprintf(BUF, "%s", VAR)
+       ethtool_puts(BUF, VAR)

-       ethtool_sprintf(&BUF, "%s", VAR)
+       ethtool_puts(&BUF, VAR)

[5]: $ rg "ethtool_sprintf\(\s*[^,)]+\s*,\s*[^,)]+\s*\)"

Signed-off-by: Justin Stitt <justinstitt@google.com>
---
Changes in v5:
- updated documentation to include info about the lack of a trailing newline
  (Thanks Russell)
- rebased onto mainline
- Link to v4: https://lore.kernel.org/r/20231102-ethtool_puts_impl-v4-0-14e1e9278496@google.com

Changes in v4:
- update documentation to match:
  https://lore.kernel.org/all/20231028192511.100001-1-andrew@lunn.ch/

- Link to v3: https://lore.kernel.org/r/20231027-ethtool_puts_impl-v3-0-3466ac679304@google.com

Changes in v3:
- fix force_speed_maps merge conflict + formatting (thanks Vladimir)
- rebase onto net-next (thanks Andrew, Vladimir)
- change subject (thanks Vladimir)
- fix checkpatch formatting + implementation (thanks Joe)
- Link to v2: https://lore.kernel.org/r/20231026-ethtool_puts_impl-v2-0-0d67cbdd0538@google.com

Changes in v2:
- wrap lines better in replacement (thanks Joe, Kees)
- add --fix to checkpatch (thanks Joe)
- clean up checkpatch formatting (thanks Joe, et al.)
- rebase against next
- Link to v1: https://lore.kernel.org/r/20231025-ethtool_puts_impl-v1-0-6a53a93d3b72@google.com
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

31 files changed, 139 insertions, 112 deletions

diff --git a/drivers/net/dsa/lantiq_gswip.c b/drivers/net/dsa/lantiq_gswip.c
index 9c185c9f0963..05a017c9ef3d 100644
--- a/drivers/net/dsa/lantiq_gswip.c
+++ b/drivers/net/dsa/lantiq_gswip.c
@@ -1759,7 +1759,7 @@ static void gswip_get_strings(struct dsa_switch *ds, int port, u32 stringset,
 		return;
 
 	for (i = 0; i < ARRAY_SIZE(gswip_rmon_cnt); i++)
-		ethtool_sprintf(&data, "%s", gswip_rmon_cnt[i].name);
+		ethtool_puts(&data, gswip_rmon_cnt[i].name);
 }
 
 static u32 gswip_bcm_ram_entry_read(struct gswip_priv *priv, u32 table,
diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index d27c6b70a2f6..391c4dbdff42 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c
@@ -836,7 +836,7 @@ mt7530_get_strings(struct dsa_switch *ds, int port, u32 stringset,
 		return;
 
 	for (i = 0; i < ARRAY_SIZE(mt7530_mib); i++)
-		ethtool_sprintf(&data, "%s", mt7530_mib[i].name);
+		ethtool_puts(&data, mt7530_mib[i].name);
 }
 
 static void
diff --git a/drivers/net/dsa/qca/qca8k-common.c b/drivers/net/dsa/qca/qca8k-common.c
index 9243eff8918d..2358cd399c7e 100644
--- a/drivers/net/dsa/qca/qca8k-common.c
+++ b/drivers/net/dsa/qca/qca8k-common.c
@@ -487,7 +487,7 @@ void qca8k_get_strings(struct dsa_switch *ds, int port, u32 stringset,
 		return;
 
 	for (i = 0; i < priv->info->mib_count; i++)
-		ethtool_sprintf(&data, "%s", ar8327_mib[i].name);
+		ethtool_puts(&data, ar8327_mib[i].name);
 }
 
 void qca8k_get_ethtool_stats(struct dsa_switch *ds, int port,
diff --git a/drivers/net/dsa/realtek/rtl8365mb.c b/drivers/net/dsa/realtek/rtl8365mb.c
index 0875e4fc9f57..b072045eb154 100644
--- a/drivers/net/dsa/realtek/rtl8365mb.c
+++ b/drivers/net/dsa/realtek/rtl8365mb.c
@@ -1303,7 +1303,7 @@ static void rtl8365mb_get_strings(struct dsa_switch *ds, int port, u32 stringset
 
 	for (i = 0; i < RTL8365MB_MIB_END; i++) {
 		struct rtl8365mb_mib_counter *mib = &rtl8365mb_mib_counters[i];
-		ethtool_sprintf(&data, "%s", mib->name);
+		ethtool_puts(&data, mib->name);
 	}
 }
 
diff --git a/drivers/net/dsa/realtek/rtl8366-core.c b/drivers/net/dsa/realtek/rtl8366-core.c
index 82e267b8fddb..59f98d2c8769 100644
--- a/drivers/net/dsa/realtek/rtl8366-core.c
+++ b/drivers/net/dsa/realtek/rtl8366-core.c
@@ -401,7 +401,7 @@ void rtl8366_get_strings(struct dsa_switch *ds, int port, u32 stringset,
 		return;
 
 	for (i = 0; i < priv->num_mib_counters; i++)
-		ethtool_sprintf(&data, "%s", priv->mib_counters[i].name);
+		ethtool_puts(&data, priv->mib_counters[i].name);
 }
 EXPORT_SYMBOL_GPL(rtl8366_get_strings);
 
diff --git a/drivers/net/dsa/vitesse-vsc73xx-core.c b/drivers/net/dsa/vitesse-vsc73xx-core.c
index e6f29e4e508c..dd50502e2122 100644
--- a/drivers/net/dsa/vitesse-vsc73xx-core.c
+++ b/drivers/net/dsa/vitesse-vsc73xx-core.c
@@ -949,7 +949,7 @@ static void vsc73xx_get_strings(struct dsa_switch *ds, int port, u32 stringset,
 	indices[5] = ((val >> 26) & 0x1f); /* TX counter 2 */
 
 	/* The first counters is the RX octets */
-	ethtool_sprintf(&buf, "RxEtherStatsOctets");
+	ethtool_puts(&buf, "RxEtherStatsOctets");
 
 	/* Each port supports recording 3 RX counters and 3 TX counters,
 	 * figure out what counters we use in this set-up and return the
@@ -959,15 +959,15 @@ static void vsc73xx_get_strings(struct dsa_switch *ds, int port, u32 stringset,
 	 */
 	for (i = 0; i < 3; i++) {
 		cnt = vsc73xx_find_counter(vsc, indices[i], false);
-		ethtool_sprintf(&buf, "%s", cnt ? cnt->name : "");
+		ethtool_puts(&buf, cnt ? cnt->name : "");
 	}
 
 	/* TX stats begins with the number of TX octets */
-	ethtool_sprintf(&buf, "TxEtherStatsOctets");
+	ethtool_puts(&buf, "TxEtherStatsOctets");
 
 	for (i = 3; i < 6; i++) {
 		cnt = vsc73xx_find_counter(vsc, indices[i], true);
-		ethtool_sprintf(&buf, "%s", cnt ? cnt->name : "");
+		ethtool_puts(&buf, cnt ? cnt->name : "");
 
 	}
 }
diff --git a/drivers/net/ethernet/amazon/ena/ena_ethtool.c b/drivers/net/ethernet/amazon/ena/ena_ethtool.c
index d671df4b76bc..e3ef081aa42b 100644
--- a/drivers/net/ethernet/amazon/ena/ena_ethtool.c
+++ b/drivers/net/ethernet/amazon/ena/ena_ethtool.c
@@ -299,13 +299,13 @@ static void ena_get_strings(struct ena_adapter *adapter,
 
 	for (i = 0; i < ENA_STATS_ARRAY_GLOBAL; i++) {
 		ena_stats = &ena_stats_global_strings[i];
-		ethtool_sprintf(&data, ena_stats->name);
+		ethtool_puts(&data, ena_stats->name);
 	}
 
 	if (eni_stats_needed) {
 		for (i = 0; i < ENA_STATS_ARRAY_ENI(adapter); i++) {
 			ena_stats = &ena_stats_eni_strings[i];
-			ethtool_sprintf(&data, ena_stats->name);
+			ethtool_puts(&data, ena_stats->name);
 		}
 	}
 
diff --git a/drivers/net/ethernet/brocade/bna/bnad_ethtool.c b/drivers/net/ethernet/brocade/bna/bnad_ethtool.c
index df10edff5603..d1ad6c9f8140 100644
--- a/drivers/net/ethernet/brocade/bna/bnad_ethtool.c
+++ b/drivers/net/ethernet/brocade/bna/bnad_ethtool.c
@@ -608,7 +608,7 @@ bnad_get_strings(struct net_device *netdev, u32 stringset, u8 *string)
 
 	for (i = 0; i < BNAD_ETHTOOL_STATS_NUM; i++) {
 		BUG_ON(!(strlen(bnad_net_stats_strings[i]) < ETH_GSTRING_LEN));
-		ethtool_sprintf(&string, bnad_net_stats_strings[i]);
+		ethtool_puts(&string, bnad_net_stats_strings[i]);
 	}
 
 	bmap = bna_tx_rid_mask(&bnad->bna);
diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index c3b7694a7485..bae9536de767 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -2932,10 +2932,10 @@ static void fec_enet_get_strings(struct net_device *netdev,
 	switch (stringset) {
 	case ETH_SS_STATS:
 		for (i = 0; i < ARRAY_SIZE(fec_stats); i++) {
-			ethtool_sprintf(&data, "%s", fec_stats[i].name);
+			ethtool_puts(&data, fec_stats[i].name);
 		}
 		for (i = 0; i < ARRAY_SIZE(fec_xdp_stat_strs); i++) {
-			ethtool_sprintf(&data, "%s", fec_xdp_stat_strs[i]);
+			ethtool_puts(&data, fec_xdp_stat_strs[i]);
 		}
 		page_pool_ethtool_stats_get_strings(data);
 
diff --git a/drivers/net/ethernet/fungible/funeth/funeth_ethtool.c b/drivers/net/ethernet/fungible/funeth/funeth_ethtool.c
index 31aa185f4d17..091c93bd7587 100644
--- a/drivers/net/ethernet/fungible/funeth/funeth_ethtool.c
+++ b/drivers/net/ethernet/fungible/funeth/funeth_ethtool.c
@@ -655,7 +655,7 @@ static void fun_get_strings(struct net_device *netdev, u32 sset, u8 *data)
 						i);
 		}
 		for (j = 0; j < ARRAY_SIZE(txq_stat_names); j++)
-			ethtool_sprintf(&p, txq_stat_names[j]);
+			ethtool_puts(&p, txq_stat_names[j]);
 
 		for (i = 0; i < fp->num_xdpqs; i++) {
 			for (j = 0; j < ARRAY_SIZE(xdpq_stat_names); j++)
@@ -663,7 +663,7 @@ static void fun_get_strings(struct net_device *netdev, u32 sset, u8 *data)
 						xdpq_stat_names[j], i);
 		}
 		for (j = 0; j < ARRAY_SIZE(xdpq_stat_names); j++)
-			ethtool_sprintf(&p, xdpq_stat_names[j]);
+			ethtool_puts(&p, xdpq_stat_names[j]);
 
 		for (i = 0; i < netdev->real_num_rx_queues; i++) {
 			for (j = 0; j < ARRAY_SIZE(rxq_stat_names); j++)
@@ -671,10 +671,10 @@ static void fun_get_strings(struct net_device *netdev, u32 sset, u8 *data)
 						i);
 		}
 		for (j = 0; j < ARRAY_SIZE(rxq_stat_names); j++)
-			ethtool_sprintf(&p, rxq_stat_names[j]);
+			ethtool_puts(&p, rxq_stat_names[j]);
 
 		for (j = 0; j < ARRAY_SIZE(tls_stat_names); j++)
-			ethtool_sprintf(&p, tls_stat_names[j]);
+			ethtool_puts(&p, tls_stat_names[j]);
 		break;
 	default:
 		break;
diff --git a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_gmac.c b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_gmac.c
index 8f391e2adcc0..bdb7afaabdd0 100644
--- a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_gmac.c
+++ b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_gmac.c
@@ -678,7 +678,7 @@ static void hns_gmac_get_strings(u32 stringset, u8 *data)
 		return;
 
 	for (i = 0; i < ARRAY_SIZE(g_gmac_stats_string); i++)
-		ethtool_sprintf(&buff, g_gmac_stats_string[i].desc);
+		ethtool_puts(&buff, g_gmac_stats_string[i].desc);
 }
 
 static int hns_gmac_get_sset_count(int stringset)
diff --git a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_xgmac.c b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_xgmac.c
index fc26ffaae620..c58833eb4830 100644
--- a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_xgmac.c
+++ b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_xgmac.c
@@ -752,7 +752,7 @@ static void hns_xgmac_get_strings(u32 stringset, u8 *data)
 		return;
 
 	for (i = 0; i < ARRAY_SIZE(g_xgmac_stats_string); i++)
-		ethtool_sprintf(&buff, g_xgmac_stats_string[i].desc);
+		ethtool_puts(&buff, g_xgmac_stats_string[i].desc);
 }
 
 /**
diff --git a/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c b/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c
index b54f3706fb97..fe40cceb0f79 100644
--- a/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c
+++ b/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c
@@ -912,42 +912,41 @@ static void hns_get_strings(struct net_device *netdev, u32 stringset, u8 *data)
 
 	if (stringset == ETH_SS_TEST) {
 		if (priv->ae_handle->phy_if != PHY_INTERFACE_MODE_XGMII)
-			ethtool_sprintf(&buff,
-					hns_nic_test_strs[MAC_INTERNALLOOP_MAC]);
-		ethtool_sprintf(&buff,
-				hns_nic_test_strs[MAC_INTERNALLOOP_SERDES]);
+			ethtool_puts(&buff,
+				     hns_nic_test_strs[MAC_INTERNALLOOP_MAC]);
+		ethtool_puts(&buff, hns_nic_test_strs[MAC_INTERNALLOOP_SERDES]);
 		if ((netdev->phydev) && (!netdev->phydev->is_c45))
-			ethtool_sprintf(&buff,
-					hns_nic_test_strs[MAC_INTERNALLOOP_PHY]);
+			ethtool_puts(&buff,
+				     hns_nic_test_strs[MAC_INTERNALLOOP_PHY]);
 
 	} else {
-		ethtool_sprintf(&buff, "rx_packets");
-		ethtool_sprintf(&buff, "tx_packets");
-		ethtool_sprintf(&buff, "rx_bytes");
-		ethtool_sprintf(&buff, "tx_bytes");
-		ethtool_sprintf(&buff, "rx_errors");
-		ethtool_sprintf(&buff, "tx_errors");
-		ethtool_sprintf(&buff, "rx_dropped");
-		ethtool_sprintf(&buff, "tx_dropped");
-		ethtool_sprintf(&buff, "multicast");
-		ethtool_sprintf(&buff, "collisions");
-		ethtool_sprintf(&buff, "rx_over_errors");
-		ethtool_sprintf(&buff, "rx_crc_errors");
-		ethtool_sprintf(&buff, "rx_frame_errors");
-		ethtool_sprintf(&buff, "rx_fifo_errors");
-		ethtool_sprintf(&buff, "rx_missed_errors");
-		ethtool_sprintf(&buff, "tx_aborted_errors");
-		ethtool_sprintf(&buff, "tx_carrier_errors");
-		ethtool_sprintf(&buff, "tx_fifo_errors");
-		ethtool_sprintf(&buff, "tx_heartbeat_errors");
-		ethtool_sprintf(&buff, "rx_length_errors");
-		ethtool_sprintf(&buff, "tx_window_errors");
-		ethtool_sprintf(&buff, "rx_compressed");
-		ethtool_sprintf(&buff, "tx_compressed");
-		ethtool_sprintf(&buff, "netdev_rx_dropped");
-		ethtool_sprintf(&buff, "netdev_tx_dropped");
-
-		ethtool_sprintf(&buff, "netdev_tx_timeout");
+		ethtool_puts(&buff, "rx_packets");
+		ethtool_puts(&buff, "tx_packets");
+		ethtool_puts(&buff, "rx_bytes");
+		ethtool_puts(&buff, "tx_bytes");
+		ethtool_puts(&buff, "rx_errors");
+		ethtool_puts(&buff, "tx_errors");
+		ethtool_puts(&buff, "rx_dropped");
+		ethtool_puts(&buff, "tx_dropped");
+		ethtool_puts(&buff, "multicast");
+		ethtool_puts(&buff, "collisions");
+		ethtool_puts(&buff, "rx_over_errors");
+		ethtool_puts(&buff, "rx_crc_errors");
+		ethtool_puts(&buff, "rx_frame_errors");
+		ethtool_puts(&buff, "rx_fifo_errors");
+		ethtool_puts(&buff, "rx_missed_errors");
+		ethtool_puts(&buff, "tx_aborted_errors");
+		ethtool_puts(&buff, "tx_carrier_errors");
+		ethtool_puts(&buff, "tx_fifo_errors");
+		ethtool_puts(&buff, "tx_heartbeat_errors");
+		ethtool_puts(&buff, "rx_length_errors");
+		ethtool_puts(&buff, "tx_window_errors");
+		ethtool_puts(&buff, "rx_compressed");
+		ethtool_puts(&buff, "tx_compressed");
+		ethtool_puts(&buff, "netdev_rx_dropped");
+		ethtool_puts(&buff, "netdev_tx_dropped");
+
+		ethtool_puts(&buff, "netdev_tx_timeout");
 
 		h->dev->ops->get_strings(h, stringset, buff);
 	}
diff --git a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
index eb9a7b32af73..a0b10230268d 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
@@ -2523,13 +2523,11 @@ static void i40e_get_priv_flag_strings(struct net_device *netdev, u8 *data)
 	u8 *p = data;
 
 	for (i = 0; i < I40E_PRIV_FLAGS_STR_LEN; i++)
-		ethtool_sprintf(&p, "%s",
-				i40e_gstrings_priv_flags[i].flag_string);
+		ethtool_puts(&p, i40e_gstrings_priv_flags[i].flag_string);
 	if (pf->hw.pf_id != 0)
 		return;
 	for (i = 0; i < I40E_GL_PRIV_FLAGS_STR_LEN; i++)
-		ethtool_sprintf(&p, "%s",
-				i40e_gl_gstrings_priv_flags[i].flag_string);
+		ethtool_puts(&p, i40e_gl_gstrings_priv_flags[i].flag_string);
 }
 
 static void i40e_get_strings(struct net_device *netdev, u32 stringset,
diff --git a/drivers/net/ethernet/intel/iavf/iavf_ethtool.c b/drivers/net/ethernet/intel/iavf/iavf_ethtool.c
index f520855daf58..631c7cfdc814 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_ethtool.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_ethtool.c
@@ -396,8 +396,7 @@ static void iavf_get_priv_flag_strings(struct net_device *netdev, u8 *data)
 	unsigned int i;
 
 	for (i = 0; i < IAVF_PRIV_FLAGS_STR_LEN; i++)
-		ethtool_sprintf(&data, "%s",
-				iavf_gstrings_priv_flags[i].flag_string);
+		ethtool_puts(&data, iavf_gstrings_priv_flags[i].flag_string);
 }
 
 /**
diff --git a/drivers/net/ethernet/intel/ice/ice_ethtool.c b/drivers/net/ethernet/intel/ice/ice_ethtool.c
index a34083567e6f..98c9317581e0 100644
--- a/drivers/net/ethernet/intel/ice/ice_ethtool.c
+++ b/drivers/net/ethernet/intel/ice/ice_ethtool.c
@@ -1142,8 +1142,7 @@ __ice_get_strings(struct net_device *netdev, u32 stringset, u8 *data,
 	switch (stringset) {
 	case ETH_SS_STATS:
 		for (i = 0; i < ICE_VSI_STATS_LEN; i++)
-			ethtool_sprintf(&p, "%s",
-					ice_gstrings_vsi_stats[i].stat_string);
+			ethtool_puts(&p, ice_gstrings_vsi_stats[i].stat_string);
 
 		if (ice_is_port_repr_netdev(netdev))
 			return;
@@ -1162,8 +1161,7 @@ __ice_get_strings(struct net_device *netdev, u32 stringset, u8 *data,
 			return;
 
 		for (i = 0; i < ICE_PF_STATS_LEN; i++)
-			ethtool_sprintf(&p, "%s",
-					ice_gstrings_pf_stats[i].stat_string);
+			ethtool_puts(&p, ice_gstrings_pf_stats[i].stat_string);
 
 		for (i = 0; i < ICE_MAX_USER_PRIORITY; i++) {
 			ethtool_sprintf(&p, "tx_priority_%u_xon.nic", i);
@@ -1179,8 +1177,7 @@ __ice_get_strings(struct net_device *netdev, u32 stringset, u8 *data,
 		break;
 	case ETH_SS_PRIV_FLAGS:
 		for (i = 0; i < ICE_PRIV_FLAG_ARRAY_SIZE; i++)
-			ethtool_sprintf(&p, "%s",
-					ice_gstrings_priv_flags[i].name);
+			ethtool_puts(&p, ice_gstrings_priv_flags[i].name);
 		break;
 	default:
 		break;
diff --git a/drivers/net/ethernet/intel/idpf/idpf_ethtool.c b/drivers/net/ethernet/intel/idpf/idpf_ethtool.c
index 52ea38669f85..bf58989a573e 100644
--- a/drivers/net/ethernet/intel/idpf/idpf_ethtool.c
+++ b/drivers/net/ethernet/intel/idpf/idpf_ethtool.c
@@ -532,7 +532,7 @@ static void idpf_add_stat_strings(u8 **p, const struct idpf_stats *stats,
 	unsigned int i;
 
 	for (i = 0; i < size; i++)
-		ethtool_sprintf(p, "%s", stats[i].stat_string);
+		ethtool_puts(p, stats[i].stat_string);
 }
 
 /**
diff --git a/drivers/net/ethernet/intel/igb/igb_ethtool.c b/drivers/net/ethernet/intel/igb/igb_ethtool.c
index 16d2a55d5e17..89dac7b215e5 100644
--- a/drivers/net/ethernet/intel/igb/igb_ethtool.c
+++ b/drivers/net/ethernet/intel/igb/igb_ethtool.c
@@ -2356,11 +2356,9 @@ static void igb_get_strings(struct net_device *netdev, u32 stringset, u8 *data)
 		break;
 	case ETH_SS_STATS:
 		for (i = 0; i < IGB_GLOBAL_STATS_LEN; i++)
-			ethtool_sprintf(&p, "%s",
-					igb_gstrings_stats[i].stat_string);
+			ethtool_puts(&p, igb_gstrings_stats[i].stat_string);
 		for (i = 0; i < IGB_NETDEV_STATS_LEN; i++)
-			ethtool_sprintf(&p, "%s",
-					igb_gstrings_net_stats[i].stat_string);
+			ethtool_puts(&p, igb_gstrings_net_stats[i].stat_string);
 		for (i = 0; i < adapter->num_tx_queues; i++) {
 			ethtool_sprintf(&p, "tx_queue_%u_packets", i);
 			ethtool_sprintf(&p, "tx_queue_%u_bytes", i);
diff --git a/drivers/net/ethernet/intel/igc/igc_ethtool.c b/drivers/net/ethernet/intel/igc/igc_ethtool.c
index 785eaa8e0ba8..2ed92bf34059 100644
--- a/drivers/net/ethernet/intel/igc/igc_ethtool.c
+++ b/drivers/net/ethernet/intel/igc/igc_ethtool.c
@@ -773,11 +773,9 @@ static void igc_ethtool_get_strings(struct net_device *netdev, u32 stringset,
 		break;
 	case ETH_SS_STATS:
 		for (i = 0; i < IGC_GLOBAL_STATS_LEN; i++)
-			ethtool_sprintf(&p, "%s",
-					igc_gstrings_stats[i].stat_string);
+			ethtool_puts(&p, igc_gstrings_stats[i].stat_string);
 		for (i = 0; i < IGC_NETDEV_STATS_LEN; i++)
-			ethtool_sprintf(&p, "%s",
-					igc_gstrings_net_stats[i].stat_string);
+			ethtool_puts(&p, igc_gstrings_net_stats[i].stat_string);
 		for (i = 0; i < adapter->num_tx_queues; i++) {
 			ethtool_sprintf(&p, "tx_queue_%u_packets", i);
 			ethtool_sprintf(&p, "tx_queue_%u_bytes", i);
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
index 4dd897806fa5..dd722b0381e0 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
@@ -1413,12 +1413,11 @@ static void ixgbe_get_strings(struct net_device *netdev, u32 stringset,
 	switch (stringset) {
 	case ETH_SS_TEST:
 		for (i = 0; i < IXGBE_TEST_LEN; i++)
-			ethtool_sprintf(&p, "%s", ixgbe_gstrings_test[i]);
+			ethtool_puts(&p, ixgbe_gstrings_test[i]);
 		break;
 	case ETH_SS_STATS:
 		for (i = 0; i < IXGBE_GLOBAL_STATS_LEN; i++)
-			ethtool_sprintf(&p, "%s",
-					ixgbe_gstrings_stats[i].stat_string);
+			ethtool_puts(&p, ixgbe_gstrings_stats[i].stat_string);
 		for (i = 0; i < netdev->num_tx_queues; i++) {
 			ethtool_sprintf(&p, "tx_queue_%u_packets", i);
 			ethtool_sprintf(&p, "tx_queue_%u_bytes", i);
diff --git a/drivers/net/ethernet/microchip/sparx5/sparx5_ethtool.c b/drivers/net/ethernet/microchip/sparx5/sparx5_ethtool.c
index 37d2584b48a7..a06dc5a9b355 100644
--- a/drivers/net/ethernet/microchip/sparx5/sparx5_ethtool.c
+++ b/drivers/net/ethernet/microchip/sparx5/sparx5_ethtool.c
@@ -1012,7 +1012,7 @@ static void sparx5_get_sset_strings(struct net_device *ndev, u32 sset, u8 *data)
 		return;
 
 	for (idx = 0; idx < sparx5->num_ethtool_stats; idx++)
-		ethtool_sprintf(&data, "%s", sparx5->stats_layout[idx]);
+		ethtool_puts(&data, sparx5->stats_layout[idx]);
 }
 
 static void sparx5_get_sset_data(struct net_device *ndev,
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c b/drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c
index f4f6153cae0f..ff9f39969215 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c
@@ -807,7 +807,7 @@ static void nfp_get_self_test_strings(struct net_device *netdev, u8 *data)
 
 	for (i = 0; i < NFP_TEST_TOTAL_NUM; i++)
 		if (nfp_self_test[i].is_supported(netdev))
-			ethtool_sprintf(&data, nfp_self_test[i].name);
+			ethtool_puts(&data, nfp_self_test[i].name);
 }
 
 static int nfp_get_self_test_count(struct net_device *netdev)
@@ -859,24 +859,24 @@ static u8 *nfp_vnic_get_sw_stats_strings(struct net_device *netdev, u8 *data)
 		ethtool_sprintf(&data, "rvec_%u_tx_busy", i);
 	}
 
-	ethtool_sprintf(&data, "hw_rx_csum_ok");
-	ethtool_sprintf(&data, "hw_rx_csum_inner_ok");
-	ethtool_sprintf(&data, "hw_rx_csum_complete");
-	ethtool_sprintf(&data, "hw_rx_csum_err");
-	ethtool_sprintf(&data, "rx_replace_buf_alloc_fail");
-	ethtool_sprintf(&data, "rx_tls_decrypted_packets");
-	ethtool_sprintf(&data, "hw_tx_csum");
-	ethtool_sprintf(&data, "hw_tx_inner_csum");
-	ethtool_sprintf(&data, "tx_gather");
-	ethtool_sprintf(&data, "tx_lso");
-	ethtool_sprintf(&data, "tx_tls_encrypted_packets");
-	ethtool_sprintf(&data, "tx_tls_ooo");
-	ethtool_sprintf(&data, "tx_tls_drop_no_sync_data");
-
-	ethtool_sprintf(&data, "hw_tls_no_space");
-	ethtool_sprintf(&data, "rx_tls_resync_req_ok");
-	ethtool_sprintf(&data, "rx_tls_resync_req_ign");
-	ethtool_sprintf(&data, "rx_tls_resync_sent");
+	ethtool_puts(&data, "hw_rx_csum_ok");
+	ethtool_puts(&data, "hw_rx_csum_inner_ok");
+	ethtool_puts(&data, "hw_rx_csum_complete");
+	ethtool_puts(&data, "hw_rx_csum_err");
+	ethtool_puts(&data, "rx_replace_buf_alloc_fail");
+	ethtool_puts(&data, "rx_tls_decrypted_packets");
+	ethtool_puts(&data, "hw_tx_csum");
+	ethtool_puts(&data, "hw_tx_inner_csum");
+	ethtool_puts(&data, "tx_gather");
+	ethtool_puts(&data, "tx_lso");
+	ethtool_puts(&data, "tx_tls_encrypted_packets");
+	ethtool_puts(&data, "tx_tls_ooo");
+	ethtool_puts(&data, "tx_tls_drop_no_sync_data");
+
+	ethtool_puts(&data, "hw_tls_no_space");
+	ethtool_puts(&data, "rx_tls_resync_req_ok");
+	ethtool_puts(&data, "rx_tls_resync_req_ign");
+	ethtool_puts(&data, "rx_tls_resync_sent");
 
 	return data;
 }
@@ -950,13 +950,13 @@ nfp_vnic_get_hw_stats_strings(u8 *data, unsigned int num_vecs, bool repr)
 	swap_off = repr * NN_ET_SWITCH_STATS_LEN;
 
 	for (i = 0; i < NN_ET_SWITCH_STATS_LEN; i++)
-		ethtool_sprintf(&data, nfp_net_et_stats[i + swap_off].name);
+		ethtool_puts(&data, nfp_net_et_stats[i + swap_off].name);
 
 	for (i = NN_ET_SWITCH_STATS_LEN; i < NN_ET_SWITCH_STATS_LEN * 2; i++)
-		ethtool_sprintf(&data, nfp_net_et_stats[i - swap_off].name);
+		ethtool_puts(&data, nfp_net_et_stats[i - swap_off].name);
 
 	for (i = NN_ET_SWITCH_STATS_LEN * 2; i < NN_ET_GLOBAL_STATS_LEN; i++)
-		ethtool_sprintf(&data, nfp_net_et_stats[i].name);
+		ethtool_puts(&data, nfp_net_et_stats[i].name);
 
 	for (i = 0; i < num_vecs; i++) {
 		ethtool_sprintf(&data, "rxq_%u_pkts", i);
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_stats.c b/drivers/net/ethernet/pensando/ionic/ionic_stats.c
index 9859a4432985..1f6022fb7679 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_stats.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_stats.c
@@ -258,10 +258,10 @@ static void ionic_sw_stats_get_strings(struct ionic_lif *lif, u8 **buf)
 	int i, q_num;
 
 	for (i = 0; i < IONIC_NUM_LIF_STATS; i++)
-		ethtool_sprintf(buf, ionic_lif_stats_desc[i].name);
+		ethtool_puts(buf, ionic_lif_stats_desc[i].name);
 
 	for (i = 0; i < IONIC_NUM_PORT_STATS; i++)
-		ethtool_sprintf(buf, ionic_port_stats_desc[i].name);
+		ethtool_puts(buf, ionic_port_stats_desc[i].name);
 
 	for (q_num = 0; q_num < MAX_Q(lif); q_num++)
 		ionic_sw_stats_get_tx_strings(lif, buf, q_num);
diff --git a/drivers/net/ethernet/wangxun/libwx/wx_ethtool.c b/drivers/net/ethernet/wangxun/libwx/wx_ethtool.c
index ddc5f6d20b9c..6e9e5f01c152 100644
--- a/drivers/net/ethernet/wangxun/libwx/wx_ethtool.c
+++ b/drivers/net/ethernet/wangxun/libwx/wx_ethtool.c
@@ -75,7 +75,7 @@ void wx_get_strings(struct net_device *netdev, u32 stringset, u8 *data)
 	switch (stringset) {
 	case ETH_SS_STATS:
 		for (i = 0; i < WX_GLOBAL_STATS_LEN; i++)
-			ethtool_sprintf(&p, wx_gstrings_stats[i].stat_string);
+			ethtool_puts(&p, wx_gstrings_stats[i].stat_string);
 		for (i = 0; i < netdev->num_tx_queues; i++) {
 			ethtool_sprintf(&p, "tx_queue_%u_packets", i);
 			ethtool_sprintf(&p, "tx_queue_%u_bytes", i);
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index 706ea5263e87..1e2fa0ec2327 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -1582,10 +1582,10 @@ static void netvsc_get_strings(struct net_device *dev, u32 stringset, u8 *data)
 	switch (stringset) {
 	case ETH_SS_STATS:
 		for (i = 0; i < ARRAY_SIZE(netvsc_stats); i++)
-			ethtool_sprintf(&p, netvsc_stats[i].name);
+			ethtool_puts(&p, netvsc_stats[i].name);
 
 		for (i = 0; i < ARRAY_SIZE(vf_stats); i++)
-			ethtool_sprintf(&p, vf_stats[i].name);
+			ethtool_puts(&p, vf_stats[i].name);
 
 		for (i = 0; i < nvdev->num_chn; i++) {
 			ethtool_sprintf(&p, "tx_queue_%u_packets", i);
diff --git a/drivers/net/phy/nxp-tja11xx.c b/drivers/net/phy/nxp-tja11xx.c
index a71399965142..2c263ae44b4f 100644
--- a/drivers/net/phy/nxp-tja11xx.c
+++ b/drivers/net/phy/nxp-tja11xx.c
@@ -415,7 +415,7 @@ static void tja11xx_get_strings(struct phy_device *phydev, u8 *data)
 	int i;
 
 	for (i = 0; i < ARRAY_SIZE(tja11xx_hw_stats); i++)
-		ethtool_sprintf(&data, "%s", tja11xx_hw_stats[i].string);
+		ethtool_puts(&data, tja11xx_hw_stats[i].string);
 }
 
 static void tja11xx_get_stats(struct phy_device *phydev,
diff --git a/drivers/net/phy/smsc.c b/drivers/net/phy/smsc.c
index 1c7306a1af13..150aea7c9c36 100644
--- a/drivers/net/phy/smsc.c
+++ b/drivers/net/phy/smsc.c
@@ -508,7 +508,7 @@ static void smsc_get_strings(struct phy_device *phydev, u8 *data)
 	int i;
 
 	for (i = 0; i < ARRAY_SIZE(smsc_hw_stats); i++)
-		ethtool_sprintf(&data, "%s", smsc_hw_stats[i].string);
+		ethtool_puts(&data, smsc_hw_stats[i].string);
 }
 
 static u64 smsc_get_stat(struct phy_device *phydev, int i)
diff --git a/drivers/net/vmxnet3/vmxnet3_ethtool.c b/drivers/net/vmxnet3/vmxnet3_ethtool.c
index 98c22d7d87a2..8f5f202cde39 100644
--- a/drivers/net/vmxnet3/vmxnet3_ethtool.c
+++ b/drivers/net/vmxnet3/vmxnet3_ethtool.c
@@ -245,20 +245,20 @@ vmxnet3_get_strings(struct net_device *netdev, u32 stringset, u8 *buf)
 
 	for (j = 0; j < adapter->num_tx_queues; j++) {
 		for (i = 0; i < ARRAY_SIZE(vmxnet3_tq_dev_stats); i++)
-			ethtool_sprintf(&buf, vmxnet3_tq_dev_stats[i].desc);
+			ethtool_puts(&buf, vmxnet3_tq_dev_stats[i].desc);
 		for (i = 0; i < ARRAY_SIZE(vmxnet3_tq_driver_stats); i++)
-			ethtool_sprintf(&buf, vmxnet3_tq_driver_stats[i].desc);
+			ethtool_puts(&buf, vmxnet3_tq_driver_stats[i].desc);
 	}
 
 	for (j = 0; j < adapter->num_rx_queues; j++) {
 		for (i = 0; i < ARRAY_SIZE(vmxnet3_rq_dev_stats); i++)
-			ethtool_sprintf(&buf, vmxnet3_rq_dev_stats[i].desc);
+			ethtool_puts(&buf, vmxnet3_rq_dev_stats[i].desc);
 		for (i = 0; i < ARRAY_SIZE(vmxnet3_rq_driver_stats); i++)
-			ethtool_sprintf(&buf, vmxnet3_rq_driver_stats[i].desc);
+			ethtool_puts(&buf, vmxnet3_rq_driver_stats[i].desc);
 	}
 
 	for (i = 0; i < ARRAY_SIZE(vmxnet3_global_stats); i++)
-		ethtool_sprintf(&buf, vmxnet3_global_stats[i].desc);
+		ethtool_puts(&buf, vmxnet3_global_stats[i].desc);
 }
 
 netdev_features_t vmxnet3_fix_features(struct net_device *netdev,
diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index c2bb74143eda..deb683d3360f 100644
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -1061,6 +1061,19 @@ int ethtool_get_ts_info_by_layer(struct net_device *dev, struct ethtool_ts_info
  */
 extern __printf(2, 3) void ethtool_sprintf(u8 **data, const char *fmt, ...);
 
+/**
+ * ethtool_puts - Write string to ethtool string data
+ * @data: Pointer to a pointer to the start of string to update
+ * @str: String to write
+ *
+ * Write string to *data without a trailing newline. Update *data
+ * to point at start of next string.
+ *
+ * Prefer this function to ethtool_sprintf() when given only
+ * two arguments or if @fmt is just "%s".
+ */
+extern void ethtool_puts(u8 **data, const char *str);
+
 /* Link mode to forced speed capabilities maps */
 struct ethtool_forced_speed_map {
 	u32		speed;
diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c
index a977f8903467..755a4be01bef 100644
--- a/net/ethtool/ioctl.c
+++ b/net/ethtool/ioctl.c
@@ -1994,6 +1994,13 @@ __printf(2, 3) void ethtool_sprintf(u8 **data, const char *fmt, ...)
 }
 EXPORT_SYMBOL(ethtool_sprintf);
 
+void ethtool_puts(u8 **data, const char *str)
+{
+	strscpy(*data, str, ETH_GSTRING_LEN);
+	*data += ETH_GSTRING_LEN;
+}
+EXPORT_SYMBOL(ethtool_puts);
+
 static int ethtool_phys_id(struct net_device *dev, void __user *useraddr)
 {
 	struct ethtool_value id;
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 25fdb7fda112..6924731110d8 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -7011,6 +7011,25 @@ sub process {
 			     "Prefer strscpy, strscpy_pad, or __nonstring over strncpy - see: https://github.com/KSPP/linux/issues/90\n" . $herecurr);
 		}
 
+# ethtool_sprintf uses that should likely be ethtool_puts
+		if ($line =~ /\bethtool_sprintf\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\)/) {
+			if (WARN("PREFER_ETHTOOL_PUTS",
+				 "Prefer ethtool_puts over ethtool_sprintf with only two arguments\n" . $herecurr) &&
+			    $fix) {
+				$fixed[$fixlinenr] =~ s/\bethtool_sprintf\s*\(\s*($FuncArg)\s*,\s*($FuncArg)/ethtool_puts($1, $7)/;
+			}
+		}
+
+		# use $rawline because $line loses %s via sanitization and thus we can't match against it.
+		if ($rawline =~ /\bethtool_sprintf\s*\(\s*$FuncArg\s*,\s*\"\%s\"\s*,\s*$FuncArg\s*\)/) {
+			if (WARN("PREFER_ETHTOOL_PUTS",
+				 "Prefer ethtool_puts over ethtool_sprintf with standalone \"%s\" specifier\n" . $herecurr) &&
+			    $fix) {
+				$fixed[$fixlinenr] =~ s/\bethtool_sprintf\s*\(\s*($FuncArg)\s*,\s*"\%s"\s*,\s*($FuncArg)/ethtool_puts($1, $7)/;
+			}
+		}
+
+
 # typecasts on min/max could be min_t/max_t
 		if ($perl_version_ok &&
 		    defined $stat &&