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

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

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@xxxxxxxxxxx>
---
 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


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxxx
https://lists.xenproject.org/mailman/listinfo/xen-devel