diff mbox series

[net,4/9] net/smc: don't wait for send buffer space when data was already sent

Message ID 20190130175108.103221-5-ubraun@linux.ibm.com
State Accepted
Delegated to: David Miller
Headers show
Series net/smc: fixes 2019-01-30 | expand

Commit Message

Ursula Braun Jan. 30, 2019, 5:51 p.m. UTC 
From: Karsten Graul <kgraul@linux.ibm.com>

When there is no more send buffer space and at least 1 byte was already
sent then return to user space. The wait is only done when no data was
sent by the sendmsg() call.
This fixes smc_tx_sendmsg() which tried to always send all user data and
started to wait for free send buffer space when needed. During this wait
the user space program was blocked in the sendmsg() call and hence not
able to receive incoming data. When both sides were in such a situation
then the connection stalled forever.

Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
---
 net/smc/smc_tx.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/net/smc/smc_tx.c b/net/smc/smc_tx.c
index d8366ed51757..f99951f3f7fd 100644
--- a/net/smc/smc_tx.c
+++ b/net/smc/smc_tx.c
@@ -165,12 +165,11 @@  int smc_tx_sendmsg(struct smc_sock *smc, struct msghdr *msg, size_t len)
 			conn->local_tx_ctrl.prod_flags.urg_data_pending = 1;
 
 		if (!atomic_read(&conn->sndbuf_space) || conn->urg_tx_pend) {
+			if (send_done)
+				return send_done;
 			rc = smc_tx_wait(smc, msg->msg_flags);
-			if (rc) {
-				if (send_done)
-					return send_done;
+			if (rc)
 				goto out_err;
-			}
 			continue;
 		}