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net/arp: release the device lock before waiting for a resolution

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The -EINPROGRESS path jumps over the netdev_unlock() below it, so the
caller waits holding d_lock.  The receive path needs that same lock to
dispatch the ARP reply, and the interface stalls for good.

Assisted-by: Claude Code:claude-opus-5
Signed-off-by: Felipe Moura <moura.fmo@gmail.com>
This commit is contained in:
Felipe Moura 2026-08-16 17:28:55 -03:00 • committed by Xiang Xiao
parent 94703f50ad
commit b6583cc4b6
1 changed files with 5 additions and 0 deletions
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5
net/arp/arp_send.c
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@ -328,8 +328,13 @@ int arp_send(in_addr_t ipaddr)
{
/* ARP request for the same destination is in progress, directly
* wait arp response notify.
*
* Drop the device lock: this path skips the netdev_unlock()
* below, and the receive path needs that same lock to deliver
* the reply. The waiter above is already installed.
*/
netdev_unlock(dev);
goto wait;
}