From d1a75e0896f5e9f5cb6a979caaea39f1f4b9feb1 Mon Sep 17 00:00:00 2001
From: Stefano Stabellini <sstabellini@kernel.org>
Date: Wed, 14 Feb 2018 10:28:24 -0800
Subject: pvcalls-front: wait for other operations to return when release
 passive sockets

Passive sockets can have ongoing operations on them, specifically, we
have two wait_event_interruptable calls in pvcalls_front_accept.

Add two wake_up calls in pvcalls_front_release, then wait for the
potential waiters to return and release the sock_mapping refcount.

Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
Acked-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
---
 drivers/xen/pvcalls-front.c | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'drivers')

diff --git a/drivers/xen/pvcalls-front.c b/drivers/xen/pvcalls-front.c
index 11ce470b41a5..aedbee3b2838 100644
--- a/drivers/xen/pvcalls-front.c
+++ b/drivers/xen/pvcalls-front.c
@@ -1018,6 +1018,12 @@ int pvcalls_front_release(struct socket *sock)
 
 		pvcalls_front_free_map(bedata, map);
 	} else {
+		wake_up(&bedata->inflight_req);
+		wake_up(&map->passive.inflight_accept_req);
+
+		while (atomic_read(&map->refcount) > 1)
+			cpu_relax();
+
 		spin_lock(&bedata->socket_lock);
 		list_del(&map->list);
 		spin_unlock(&bedata->socket_lock);
-- 
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