From b48596efbcaeba3d38a388d43e553ca80a3f4fcc Mon Sep 17 00:00:00 2001
From: Ziye Yang <ziye.yang@intel.com>
Date: Tue, 5 Jan 2021 19:25:17 +0800
Subject: [PATCH] lib/nbd: Remove errno != EWOULDBLOCK in nbd_socket_rw

In this commit (a1d4a714b25aa26068e3e3e686dfd2c1283164df),
we refactor the code but introduce the new error comparison.

And it causes the hang issue in some cases for RPC, so remove
it.

Change-Id: I4da802dff24b7efc27dd25a05739f1def37c1486
Signed-off-by: Ziye Yang <ziye.yang@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/5767
Community-CI: Mellanox Build Bot
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: <dongx.yi@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
---
 lib/nbd/nbd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/nbd/nbd.c b/lib/nbd/nbd.c
index 195b0b1e9..14ac179bf 100644
--- a/lib/nbd/nbd.c
+++ b/lib/nbd/nbd.c
@@ -439,7 +439,7 @@ nbd_socket_rw(int fd, void *buf, size_t length, bool read_op)
 	if (rc == 0) {
 		return -EIO;
 	} else if (rc == -1) {
-		if (errno != EAGAIN && errno != EWOULDBLOCK) {
+		if (errno != EAGAIN) {
 			return -errno;
 		}
 		return 0;