From 8d8b1a422c4644891e1f8a3ea10b544b65cd0cc6 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Tue, 7 May 2024 18:41:44 +0000 Subject: [PATCH] net: annotate data-races around dev->if_port Various ndo_set_config() methods can change dev->if_port dev->if_port is going to be read locklessly from rtnl_fill_link_ifmap(). Add corresponding WRITE_ONCE() on writer sides. Signed-off-by: Eric Dumazet Reviewed-by: Simon Horman Link: https://lore.kernel.org/r/20240507184144.1230469-1-edumazet@google.com Signed-off-by: Jakub Kicinski --- drivers/net/ethernet/3com/3c589_cs.c | 2 +- drivers/net/ethernet/8390/etherh.c | 2 +- drivers/net/ethernet/8390/pcnet_cs.c | 2 +- drivers/net/ethernet/amd/nmclan_cs.c | 2 +- drivers/net/ethernet/sis/sis900.c | 6 +++--- drivers/net/ethernet/smsc/smc91c92_cs.c | 2 +- drivers/net/ethernet/xircom/xirc2ps_cs.c | 4 ++-- 7 files changed, 10 insertions(+), 10 deletions(-) diff --git a/drivers/net/ethernet/3com/3c589_cs.c b/drivers/net/ethernet/3com/3c589_cs.c index 5267e9dcd87e..be58dac0502a 100644 --- a/drivers/net/ethernet/3com/3c589_cs.c +++ b/drivers/net/ethernet/3com/3c589_cs.c @@ -502,7 +502,7 @@ static int el3_config(struct net_device *dev, struct ifmap *map) { if ((map->port != (u_char)(-1)) && (map->port != dev->if_port)) { if (map->port <= 3) { - dev->if_port = map->port; + WRITE_ONCE(dev->if_port, map->port); netdev_info(dev, "switched to %s port\n", if_names[dev->if_port]); tc589_set_xcvr(dev, dev->if_port); } else { diff --git a/drivers/net/ethernet/8390/etherh.c b/drivers/net/ethernet/8390/etherh.c index 05d39ecb97ff..e876fe52399a 100644 --- a/drivers/net/ethernet/8390/etherh.c +++ b/drivers/net/ethernet/8390/etherh.c @@ -258,7 +258,7 @@ static int etherh_set_config(struct net_device *dev, struct ifmap *map) * media type, turn off automedia detection. */ dev->flags &= ~IFF_AUTOMEDIA; - dev->if_port = map->port; + WRITE_ONCE(dev->if_port, map->port); break; default: diff --git a/drivers/net/ethernet/8390/pcnet_cs.c b/drivers/net/ethernet/8390/pcnet_cs.c index 9bd5e991f1e5..780fb4afb6af 100644 --- a/drivers/net/ethernet/8390/pcnet_cs.c +++ b/drivers/net/ethernet/8390/pcnet_cs.c @@ -994,7 +994,7 @@ static int set_config(struct net_device *dev, struct ifmap *map) return -EOPNOTSUPP; else if ((map->port < 1) || (map->port > 2)) return -EINVAL; - dev->if_port = map->port; + WRITE_ONCE(dev->if_port, map->port); netdev_info(dev, "switched to %s port\n", if_names[dev->if_port]); NS8390_init(dev, 1); } diff --git a/drivers/net/ethernet/amd/nmclan_cs.c b/drivers/net/ethernet/amd/nmclan_cs.c index 0dd391c84c13..37054a670407 100644 --- a/drivers/net/ethernet/amd/nmclan_cs.c +++ b/drivers/net/ethernet/amd/nmclan_cs.c @@ -760,7 +760,7 @@ static int mace_config(struct net_device *dev, struct ifmap *map) { if ((map->port != (u_char)(-1)) && (map->port != dev->if_port)) { if (map->port <= 2) { - dev->if_port = map->port; + WRITE_ONCE(dev->if_port, map->port); netdev_info(dev, "switched to %s port\n", if_names[dev->if_port]); } else return -EINVAL; diff --git a/drivers/net/ethernet/sis/sis900.c b/drivers/net/ethernet/sis/sis900.c index cb7fec226cab..85b850372efe 100644 --- a/drivers/net/ethernet/sis/sis900.c +++ b/drivers/net/ethernet/sis/sis900.c @@ -2273,7 +2273,7 @@ static int sis900_set_config(struct net_device *dev, struct ifmap *map) * (which seems to be different from the ifport(pcmcia) definition) */ switch(map->port){ case IF_PORT_UNKNOWN: /* use auto here */ - dev->if_port = map->port; + WRITE_ONCE(dev->if_port, map->port); /* we are going to change the media type, so the Link * will be temporary down and we need to reflect that * here. When the Link comes up again, it will be @@ -2294,7 +2294,7 @@ static int sis900_set_config(struct net_device *dev, struct ifmap *map) break; case IF_PORT_10BASET: /* 10BaseT */ - dev->if_port = map->port; + WRITE_ONCE(dev->if_port, map->port); /* we are going to change the media type, so the Link * will be temporary down and we need to reflect that @@ -2315,7 +2315,7 @@ static int sis900_set_config(struct net_device *dev, struct ifmap *map) case IF_PORT_100BASET: /* 100BaseT */ case IF_PORT_100BASETX: /* 100BaseTx */ - dev->if_port = map->port; + WRITE_ONCE(dev->if_port, map->port); /* we are going to change the media type, so the Link * will be temporary down and we need to reflect that diff --git a/drivers/net/ethernet/smsc/smc91c92_cs.c b/drivers/net/ethernet/smsc/smc91c92_cs.c index 29bb19f42de9..86e3ec25df07 100644 --- a/drivers/net/ethernet/smsc/smc91c92_cs.c +++ b/drivers/net/ethernet/smsc/smc91c92_cs.c @@ -1595,7 +1595,7 @@ static int s9k_config(struct net_device *dev, struct ifmap *map) return -EOPNOTSUPP; else if (map->port > 2) return -EINVAL; - dev->if_port = map->port; + WRITE_ONCE(dev->if_port, map->port); netdev_info(dev, "switched to %s port\n", if_names[dev->if_port]); smc_reset(dev); } diff --git a/drivers/net/ethernet/xircom/xirc2ps_cs.c b/drivers/net/ethernet/xircom/xirc2ps_cs.c index e9bc38fd2025..a31d5d5e6593 100644 --- a/drivers/net/ethernet/xircom/xirc2ps_cs.c +++ b/drivers/net/ethernet/xircom/xirc2ps_cs.c @@ -1366,10 +1366,10 @@ do_config(struct net_device *dev, struct ifmap *map) return -EINVAL; if (!map->port) { local->probe_port = 1; - dev->if_port = 1; + WRITE_ONCE(dev->if_port, 1); } else { local->probe_port = 0; - dev->if_port = map->port; + WRITE_ONCE(dev->if_port, map->port); } netdev_info(dev, "switching to %s port\n", if_names[dev->if_port]); do_reset(dev,1); /* not the fine way :-) */