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| author | Eric Dumazet <edumazet@google.com> | 2024-05-06 10:28:12 +0000 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2024-05-07 16:19:14 -0700 |
| commit | 1eb2cded45b35816085c1f962933c187d970f9dc (patch) | |
| tree | 27a26692748d3c69fcd896a10db9bc89c1eb54b5 /drivers/net/ethernet/sfc | |
| parent | feb8c2b76eb3fae59a1f62451508c98c36db5e3a (diff) | |
| download | lwn-1eb2cded45b35816085c1f962933c187d970f9dc.tar.gz lwn-1eb2cded45b35816085c1f962933c187d970f9dc.zip | |
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/sfc')
| -rw-r--r-- | drivers/net/ethernet/sfc/efx_common.c | 2 | ||||
| -rw-r--r-- | drivers/net/ethernet/sfc/falcon/efx.c | 2 | ||||
| -rw-r--r-- | drivers/net/ethernet/sfc/siena/efx_common.c | 2 |
3 files changed, 3 insertions, 3 deletions
diff --git a/drivers/net/ethernet/sfc/efx_common.c b/drivers/net/ethernet/sfc/efx_common.c index 551f890db90a..4ebd5ae23eca 100644 --- a/drivers/net/ethernet/sfc/efx_common.c +++ b/drivers/net/ethernet/sfc/efx_common.c @@ -302,7 +302,7 @@ int efx_change_mtu(struct net_device *net_dev, int new_mtu) efx_stop_all(efx); mutex_lock(&efx->mac_lock); - net_dev->mtu = new_mtu; + WRITE_ONCE(net_dev->mtu, new_mtu); efx_mac_reconfigure(efx, true); mutex_unlock(&efx->mac_lock); diff --git a/drivers/net/ethernet/sfc/falcon/efx.c b/drivers/net/ethernet/sfc/falcon/efx.c index 1cb32aedd89c..8925745f1c17 100644 --- a/drivers/net/ethernet/sfc/falcon/efx.c +++ b/drivers/net/ethernet/sfc/falcon/efx.c @@ -2125,7 +2125,7 @@ static int ef4_change_mtu(struct net_device *net_dev, int new_mtu) ef4_stop_all(efx); mutex_lock(&efx->mac_lock); - net_dev->mtu = new_mtu; + WRITE_ONCE(net_dev->mtu, new_mtu); ef4_mac_reconfigure(efx); mutex_unlock(&efx->mac_lock); diff --git a/drivers/net/ethernet/sfc/siena/efx_common.c b/drivers/net/ethernet/sfc/siena/efx_common.c index 88e5bc347a44..cf195162e270 100644 --- a/drivers/net/ethernet/sfc/siena/efx_common.c +++ b/drivers/net/ethernet/sfc/siena/efx_common.c @@ -306,7 +306,7 @@ int efx_siena_change_mtu(struct net_device *net_dev, int new_mtu) efx_siena_stop_all(efx); mutex_lock(&efx->mac_lock); - net_dev->mtu = new_mtu; + WRITE_ONCE(net_dev->mtu, new_mtu); efx_siena_mac_reconfigure(efx, true); mutex_unlock(&efx->mac_lock); |