From: Mustafa Ismail <redacted>

During connection establishment with a large number of
connections, it is possible that the connection requests
might fail. Adding flow control prevents this failure.
Change ibnl_unicast to use blocking to enable flow control.

Signed-off-by: Mustafa Ismail <redacted>
Signed-off-by: Faisal Latif <redacted>
Signed-off-by: Shiraz Saleem <redacted>
---

V3: update to use blocking ver. of netlink_unicast() in 
ibnl_unicast(), instead of creating new function in 
netlink header for this purpose; as was done in V1.

V2: update commit message with justification for flow control. 
CC'ing linux-netdev mailing list.

 drivers/infiniband/core/netlink.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/infiniband/core/netlink.c b/drivers/infiniband/core/netlink.c
index 9b8c20c..a6b3acb 100644
--- a/drivers/infiniband/core/netlink.c
+++ b/drivers/infiniband/core/netlink.c

@@ -229,7 +229,13 @@ static void ibnl_rcv(struct sk_buff *skb)
 int ibnl_unicast(struct sk_buff *skb, struct nlmsghdr *nlh,
 			__u32 pid)
 {
-	return nlmsg_unicast(nls, skb, pid);
+	int err;
+
+	err = netlink_unicast(nls, skb, pid, 0);
+	if (err > 0)
+		err = 0;
+
+	return err;