linux-kernel - [PATCH 2/2] pvcalls-front: wait for other operations to return when release passive sockets

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Message-Id: <1517871107-15349-2-git-send-email-sstabellini@kernel.org>
Date:   Mon,  5 Feb 2018 14:51:47 -0800
From:   Stefano Stabellini <sstabellini@...nel.org>
To:     boris.ostrovsky@...cle.com, jgross@...e.com
Cc:     sstabellini@...nel.org, xen-devel@...ts.xenproject.org,
        linux-kernel@...r.kernel.org,
        Stefano Stabellini <stefano@...reto.com>
Subject: [PATCH 2/2] 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@...reto.com>
---
 drivers/xen/pvcalls-front.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/xen/pvcalls-front.c b/drivers/xen/pvcalls-front.c
index 164d3ad..d32cac5 100644
--- a/drivers/xen/pvcalls-front.c
+++ b/drivers/xen/pvcalls-front.c
@@ -1017,6 +1017,12 @@ 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);
-- 
1.9.1