[PATCH 11/11] can: isotp: publish tx.state with smp_store_release()

[Jinjie Ruan]

The writer already pairs with the smp_load_acquire() readers
in isotp_tx_timeout()/isotp_tx_gen_done(); convert
the smp_wmb() + WRITE_ONCE() into a release store.

Assisted-by: DeepSeek:DeepSeek-V3
Signed-off-by: Jinjie Ruan <ruanjinjie@xxxxxxxxxx>
---
 net/can/isotp.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/can/isotp.c b/net/can/isotp.c
index 155530aedce2..11b653ba7c10 100644
--- a/net/can/isotp.c
+++ b/net/can/isotp.c
@@ -1156,8 +1156,8 @@ static int isotp_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
 	my_gen = isotp_inc_tx_gen(READ_ONCE(so->tx_gen));
 	isotp_set_tx_result(so, my_gen, ECOMM); /* prevent stale slot matching */
 	WRITE_ONCE(so->tx_gen, my_gen);
-	smp_wmb(); /* see smp_load_acquire() in isotp_tx_[timeout|gen_done] */
-	WRITE_ONCE(so->tx.state, ISOTP_SENDING);
+	/* Pairs with smp_load_acquire() in isotp_tx_[timeout|gen_done] */
+	smp_store_release(&so->tx.state, ISOTP_SENDING);
 	WRITE_ONCE(so->cfecho, 0);
 	spin_unlock_bh(&so->rx_lock);
 
-- 
2.34.1