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alx: acquire mutex for alx_reinit in alx_change_mtu

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alx_reinit has a lockdep assertion that the alx->mtx mutex must be held.
alx_reinit is called from two places: alx_reset and alx_change_mtu.
alx_reset does acquire alx->mtx before calling alx_reinit.
alx_change_mtu does not acquire this mutex, nor do its callers or any
path towards alx_change_mtu.
Acquire the mutex in alx_change_mtu.

The issue was introduced when the fine-grained locking was introduced
to the code to replace the RTNL. The same commit also introduced the
lockdep assertion.

Fixes: 4a5fe57e77 ("alx: use fine-grained locking instead of RTNL")
Signed-off-by: Niels Dossche <dossche.niels@gmail.com>
Link: https://lore.kernel.org/r/20220310232707.44251-1-dossche.niels@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Niels Dossche 2022-03-11 00:27:08 +01:00 • committed by Jakub Kicinski
parent 5e34af4142
commit 46b348fd2d
1 changed files with 4 additions and 1 deletions

5
drivers/net/ethernet/atheros/alx/main.c
View file

@ -1181,8 +1181,11 @@ static int alx_change_mtu(struct net_device *netdev, int mtu)
alx->hw.mtu = mtu;
alx->rxbuf_size = max(max_frame, ALX_DEF_RXBUF_SIZE);
netdev_update_features(netdev);
if (netif_running(netdev))
if (netif_running(netdev)) {
mutex_lock(&alx->mtx);
alx_reinit(alx);
mutex_unlock(&alx->mtx);
}
return 0;
}