netdev - [PATCH net-next] net/smc: Add comment for smc_tx

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Message-Id: <20220211065220.88196-1-tonylu@linux.alibaba.com>
Date:   Fri, 11 Feb 2022 14:52:21 +0800
From:   Tony Lu <tonylu@...ux.alibaba.com>
To:     raspl@...ux.ibm.com
Cc:     kgraul@...ux.ibm.com, kuba@...nel.org, davem@...emloft.net,
        netdev@...r.kernel.org, linux-s390@...r.kernel.org
Subject: [PATCH net-next] net/smc: Add comment for smc_tx_pending

The previous patch introduces a lock-free version of smc_tx_work() to
solve unnecessary lock contention, which is expected to be held lock.
So this adds comment to remind people to keep an eye out for locks.

Suggested-by: Stefan Raspl <raspl@...ux.ibm.com>
Signed-off-by: Tony Lu <tonylu@...ux.alibaba.com>
---
 net/smc/smc_tx.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/net/smc/smc_tx.c b/net/smc/smc_tx.c
index a96ce162825e..5df3940d4543 100644
--- a/net/smc/smc_tx.c
+++ b/net/smc/smc_tx.c
@@ -611,6 +611,10 @@ int smc_tx_sndbuf_nonempty(struct smc_connection *conn)
 	return rc;
 }
 
+/* Wakeup sndbuf consumers from process context
+ * since there is more data to transmit. The caller
+ * must hold sock lock.
+ */
 void smc_tx_pending(struct smc_connection *conn)
 {
 	struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
@@ -626,7 +630,8 @@ void smc_tx_pending(struct smc_connection *conn)
 }
 
 /* Wakeup sndbuf consumers from process context
- * since there is more data to transmit
+ * since there is more data to transmit in locked
+ * sock.
  */
 void smc_tx_work(struct work_struct *work)
 {
-- 
2.32.0.3.g01195cf9f