sdp: no point of waiting for data if remote host can't send

Signed-off-by: Eldad Zinger <eldadz@mellanox.co.il>

diff --git a/drivers/infiniband/ulp/sdp/sdp_main.c b/drivers/infiniband/ulp/sdp/sdp_main.c
index d67e8d411c993434f9e7bf86250905ad6e44a8cd..946becd4d283491e36dfda514a8b4138a5b49ee5 100644 (file)
--- a/drivers/infiniband/ulp/sdp/sdp_main.c
+++ b/drivers/infiniband/ulp/sdp/sdp_main.c
@@ -2389,6 +2389,17 @@ sdp_mid_data:
 
                if (poll_recv_cq(sk)) {
                        sdp_dbg_data(sk, "sk_wait_data %ld\n", timeo);
+                       if (remote_credits(ssk) <= SDP_MIN_TX_CREDITS) {
+                               /* Remote host can not send, so there is no
+                                * point of waiting for data.
+                                * This situation is possible if current host
+                                * can not send credits-update due to lack of
+                                * memory.
+                                */
+                               if (!copied)
+                                       copied = -ENOMEM;
+                               break;
+                       }
 
                        posts_handler_put(ssk, 0);
                        sk_wait_data(sk, &timeo);