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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/hyperv | |
| parent | feb8c2b76eb3fae59a1f62451508c98c36db5e3a (diff) | |
| download | linux-1eb2cded45b35816085c1f962933c187d970f9dc.tar.gz linux-1eb2cded45b35816085c1f962933c187d970f9dc.tar.bz2 linux-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/hyperv')
| -rw-r--r-- | drivers/net/hyperv/netvsc_drv.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c index 11831a1c9762..44142245343d 100644 --- a/drivers/net/hyperv/netvsc_drv.c +++ b/drivers/net/hyperv/netvsc_drv.c @@ -1233,14 +1233,14 @@ static int netvsc_change_mtu(struct net_device *ndev, int mtu) if (ret) goto rollback_vf; - ndev->mtu = mtu; + WRITE_ONCE(ndev->mtu, mtu); ret = netvsc_attach(ndev, device_info); if (!ret) goto out; /* Attempt rollback to original MTU */ - ndev->mtu = orig_mtu; + WRITE_ONCE(ndev->mtu, orig_mtu); if (netvsc_attach(ndev, device_info)) netdev_err(ndev, "restoring mtu failed\n"); |