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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/myricom | |
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/myricom')
-rw-r--r-- | drivers/net/ethernet/myricom/myri10ge/myri10ge.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/net/ethernet/myricom/myri10ge/myri10ge.c b/drivers/net/ethernet/myricom/myri10ge/myri10ge.c index 7b7e1c5b00f4..b7d9657a7af3 100644 --- a/drivers/net/ethernet/myricom/myri10ge/myri10ge.c +++ b/drivers/net/ethernet/myricom/myri10ge/myri10ge.c @@ -3036,11 +3036,11 @@ static int myri10ge_change_mtu(struct net_device *dev, int new_mtu) /* if we change the mtu on an active device, we must * reset the device so the firmware sees the change */ myri10ge_close(dev); - dev->mtu = new_mtu; + WRITE_ONCE(dev->mtu, new_mtu); myri10ge_open(dev); - } else - dev->mtu = new_mtu; - + } else { + WRITE_ONCE(dev->mtu, new_mtu); + } return 0; } |