From: Chris Mason <chris.mason@oracle.com>
Date: Fri, 3 Feb 2012 16:09:07 +0000 (-0500)
Subject: RDS: kick krdsd to send congestion map updates
X-Git-Tag: v4.1.12-92~319^2^2~2^2~36
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=f15013731b8ed36335f8916c2d5f451c62f53e12;p=users%2Fjedix%2Flinux-maple.git

RDS: kick krdsd to send congestion map updates

We can get into a deadlock on the recv spinlock because
congestion map updates can be sent in the recev path.  This
pushes the work off to krdsd instead.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
Signed-off-by: Bang Nguyen <bang.nguyen@oracle.com>
---

diff --git a/net/rds/cong.c b/net/rds/cong.c
index a79da0cc98a7..34607ac4da53 100644
--- a/net/rds/cong.c
+++ b/net/rds/cong.c
@@ -220,7 +220,7 @@ void rds_cong_queue_updates(struct rds_cong_map *map)
 	list_for_each_entry(conn, &map->m_conn_list, c_map_item) {
 		if (!test_and_set_bit(0, &conn->c_map_queued)) {
 			rds_stats_inc(s_cong_update_queued);
-			rds_send_xmit(conn);
+			queue_delayed_work(rds_wq, &conn->c_send_w, 0);
 		}
 	}