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net: netdev_tx_sent_queue() small optimization

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Change smp_mb() imediately following a set_bit()
with smp_mb__after_atomic().

Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20241018052310.2612084-1-edumazet@google.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Eric Dumazet
2024-10-18 05:23:10 +00:00
committed by Paolo Abeni
parent e44ef3f66c
commit 7cfc1b1fa8
1 changed files with 1 additions and 1 deletions
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2
include/linux/netdevice.h
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@@ -3517,7 +3517,7 @@ static inline void netdev_tx_sent_queue(struct netdev_queue *dev_queue,
* because in netdev_tx_completed_queue we update the dql_completed
* before checking the XOFF flag.
*/
smp_mb();
smp_mb__after_atomic();
/* check again in case another CPU has just made room avail */
if (unlikely(dql_avail(&dev_queue->dql) >= 0))