From: David Yang <mmyangfl@gmail.com>
Date: Thu, 22 Jan 2026 18:51:07 +0000 (+0800)
Subject: net: alacritech: Use u64_stats_t with u64_stats_sync properly
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6e9674a980f583c9545a6a12b434e277fee28e19;p=thirdparty%2Fkernel%2Flinux.git

net: alacritech: Use u64_stats_t with u64_stats_sync properly

On 64bit arches, struct u64_stats_sync is empty and provides no help
against load/store tearing. Convert to u64_stats_t to ensure atomic
operations.

Signed-off-by: David Yang <mmyangfl@gmail.com>
Link: https://patch.msgid.link/20260122185113.2760355-1-mmyangfl@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---

diff --git a/drivers/net/ethernet/alacritech/slic.h b/drivers/net/ethernet/alacritech/slic.h
index 82071d0e5f7fc..f5bb2d9a61be8 100644
--- a/drivers/net/ethernet/alacritech/slic.h
+++ b/drivers/net/ethernet/alacritech/slic.h
@@ -284,7 +284,7 @@
 #define SLIC_INC_STATS_COUNTER(st, counter)	\
 do {						\
 	u64_stats_update_begin(&(st)->syncp);	\
-	(st)->counter++;			\
+	u64_stats_inc(&(st)->counter);		\
 	u64_stats_update_end(&(st)->syncp);	\
 } while (0)
 
@@ -293,7 +293,7 @@ do {						\
 	unsigned int start;					\
 	do {							\
 		start = u64_stats_fetch_begin(&(st)->syncp);	\
-		newst = (st)->counter;				\
+		newst = u64_stats_read(&(st)->counter);		\
 	} while (u64_stats_fetch_retry(&(st)->syncp, start));	\
 }
 
@@ -407,34 +407,34 @@ struct slic_oasis_eeprom {
 };
 
 struct slic_stats {
-	u64 rx_packets;
-	u64 rx_bytes;
-	u64 rx_mcasts;
-	u64 rx_errors;
-	u64 tx_packets;
-	u64 tx_bytes;
+	u64_stats_t rx_packets;
+	u64_stats_t rx_bytes;
+	u64_stats_t rx_mcasts;
+	u64_stats_t rx_errors;
+	u64_stats_t tx_packets;
+	u64_stats_t tx_bytes;
 	/* HW STATS */
-	u64 rx_buff_miss;
-	u64 tx_dropped;
-	u64 irq_errs;
+	u64_stats_t rx_buff_miss;
+	u64_stats_t tx_dropped;
+	u64_stats_t irq_errs;
 	/* transport layer */
-	u64 rx_tpcsum;
-	u64 rx_tpoflow;
-	u64 rx_tphlen;
+	u64_stats_t rx_tpcsum;
+	u64_stats_t rx_tpoflow;
+	u64_stats_t rx_tphlen;
 	/* ip layer */
-	u64 rx_ipcsum;
-	u64 rx_iplen;
-	u64 rx_iphlen;
+	u64_stats_t rx_ipcsum;
+	u64_stats_t rx_iplen;
+	u64_stats_t rx_iphlen;
 	/* link layer */
-	u64 rx_early;
-	u64 rx_buffoflow;
-	u64 rx_lcode;
-	u64 rx_drbl;
-	u64 rx_crc;
-	u64 rx_oflow802;
-	u64 rx_uflow802;
+	u64_stats_t rx_early;
+	u64_stats_t rx_buffoflow;
+	u64_stats_t rx_lcode;
+	u64_stats_t rx_drbl;
+	u64_stats_t rx_crc;
+	u64_stats_t rx_oflow802;
+	u64_stats_t rx_uflow802;
 	/* oasis only */
-	u64 tx_carrier;
+	u64_stats_t tx_carrier;
 	struct u64_stats_sync syncp;
 };
 
diff --git a/drivers/net/ethernet/alacritech/slicoss.c b/drivers/net/ethernet/alacritech/slicoss.c
index f62851708d4f3..7488fb6ace0b4 100644
--- a/drivers/net/ethernet/alacritech/slicoss.c
+++ b/drivers/net/ethernet/alacritech/slicoss.c
@@ -378,8 +378,8 @@ static void slic_xmit_complete(struct slic_device *sdev)
 	smp_wmb();
 
 	u64_stats_update_begin(&sdev->stats.syncp);
-	sdev->stats.tx_bytes += bytes;
-	sdev->stats.tx_packets += frames;
+	u64_stats_add(&sdev->stats.tx_bytes, bytes);
+	u64_stats_add(&sdev->stats.tx_packets, frames);
 	u64_stats_update_end(&sdev->stats.syncp);
 
 	netif_tx_lock(dev);
@@ -615,8 +615,8 @@ static void slic_handle_receive(struct slic_device *sdev, unsigned int todo,
 	}
 
 	u64_stats_update_begin(&sdev->stats.syncp);
-	sdev->stats.rx_bytes += bytes;
-	sdev->stats.rx_packets += frames;
+	u64_stats_add(&sdev->stats.rx_bytes, bytes);
+	u64_stats_add(&sdev->stats.rx_packets, frames);
 	u64_stats_update_end(&sdev->stats.syncp);
 
 	slic_refill_rx_queue(sdev, GFP_ATOMIC);