diff options
| author | Eric Dumazet <edumazet@google.com> | 2024-05-06 13:28:12 +0300 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2024-05-08 02:19:14 +0300 |
| commit | 1eb2cded45b35816085c1f962933c187d970f9dc (patch) | |
| tree | 27a26692748d3c69fcd896a10db9bc89c1eb54b5 /drivers/net/ethernet/microchip | |
| parent | feb8c2b76eb3fae59a1f62451508c98c36db5e3a (diff) | |
| download | linux-1eb2cded45b35816085c1f962933c187d970f9dc.tar.xz | |
net: annotate writes on dev->mtu from ndo_change_mtu()
Simon reported that ndo_change_mtu() methods were never
updated to use WRITE_ONCE(dev->mtu, new_mtu) as hinted
in commit 501a90c94510 ("inet: protect against too small
mtu values.")
We read dev->mtu without holding RTNL in many places,
with READ_ONCE() annotations.
It is time to take care of ndo_change_mtu() methods
to use corresponding WRITE_ONCE()
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Simon Horman <horms@kernel.org>
Closes: https://lore.kernel.org/netdev/20240505144608.GB67882@kernel.org/
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Reviewed-by: Sabrina Dubroca <sd@queasysnail.net>
Reviewed-by: Simon Horman <horms@kernel.org>
Acked-by: Shannon Nelson <shannon.nelson@amd.com>
Link: https://lore.kernel.org/r/20240506102812.3025432-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'drivers/net/ethernet/microchip')
| -rw-r--r-- | drivers/net/ethernet/microchip/lan743x_main.c | 2 | ||||
| -rw-r--r-- | drivers/net/ethernet/microchip/lan966x/lan966x_main.c | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/drivers/net/ethernet/microchip/lan743x_main.c b/drivers/net/ethernet/microchip/lan743x_main.c index cee47729d022..6be8a43c908a 100644 --- a/drivers/net/ethernet/microchip/lan743x_main.c +++ b/drivers/net/ethernet/microchip/lan743x_main.c @@ -3184,7 +3184,7 @@ static int lan743x_netdev_change_mtu(struct net_device *netdev, int new_mtu) ret = lan743x_mac_set_mtu(adapter, new_mtu); if (!ret) - netdev->mtu = new_mtu; + WRITE_ONCE(netdev->mtu, new_mtu); return ret; } diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_main.c b/drivers/net/ethernet/microchip/lan966x/lan966x_main.c index b7e75da65834..b12d3b8a64fd 100644 --- a/drivers/net/ethernet/microchip/lan966x/lan966x_main.c +++ b/drivers/net/ethernet/microchip/lan966x/lan966x_main.c @@ -402,7 +402,7 @@ static int lan966x_port_change_mtu(struct net_device *dev, int new_mtu) lan_wr(DEV_MAC_MAXLEN_CFG_MAX_LEN_SET(LAN966X_HW_MTU(new_mtu)), lan966x, DEV_MAC_MAXLEN_CFG(port->chip_port)); - dev->mtu = new_mtu; + WRITE_ONCE(dev->mtu, new_mtu); if (!lan966x->fdma) return 0; |