tree 3ef509d765bcb69bf2a1c179114ba4555b8c9a55
parent 457bfc0a4bf531487ecc3cf82ec728a5e114fb1e
author Finn Thain <fthain@telegraphics.com.au> 1579730846 +1100
committer David S. Miller <davem@davemloft.net> 1579811076 +0100

net/sonic: Add mutual exclusion for accessing shared state

The netif_stop_queue() call in sonic_send_packet() races with the
netif_wake_queue() call in sonic_interrupt(). This causes issues
like "NETDEV WATCHDOG: eth0 (macsonic): transmit queue 0 timed out".
Fix this by disabling interrupts when accessing tx_skb[] and next_tx.
Update a comment to clarify the synchronization properties.

Fixes: efcce839360f ("[PATCH] macsonic/jazzsonic network drivers update")
Tested-by: Stan Johnson <userm57@yahoo.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>