From: Eldad Zinger <eldadz@mellanox.co.il>
Date: Sun, 24 Oct 2010 09:24:27 +0000 (+0200)
Subject: sdp: no point of waiting for data if remote host can't send
X-Git-Tag: v4.1.12-92~264^2~5^2~71
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=af9ca1f590cc38541763e0accc54c2cffe5fb1d0;p=users%2Fjedix%2Flinux-maple.git

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 d67e8d411c993..946becd4d2834 100644
--- 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);