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pvcalls-back: set -ENOTCONN in pvcalls_conn_back_read

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When a connection is closing we receive on pvcalls_sk_state_change
notification. Instead of setting the connection as closed immediately
(-ENOTCONN), let's read one more time from it: pvcalls_conn_back_read
will set the connection as closed when necessary.

That way, we avoid races between pvcalls_sk_state_change and
pvcalls_back_ioworker.

Signed-off-by: Stefano Stabellini <[email protected]>
Reviewed-by: Boris Ostrovsky <[email protected]>
Signed-off-by: Boris Ostrovsky <[email protected]>
This commit is contained in:
Stefano Stabellini authored and Boris Ostrovsky committed 2019-01-02 11:00:38 -05:00
1 parent d90a1ca60a
commit e6587cdbd7
1 file changed
+4 -3
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drivers/xen/pvcalls-back.c
+4 -3
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@@ -160,9 +160,10 @@ static void pvcalls_conn_back_read(void *opaque)
/* write the data, then modify the indexes */
virt_wmb();
if (ret < 0)
if (ret < 0) {
atomic_set(&map->read, 0);
intf->in_error = ret;
else
} else
intf->in_prod = prod + ret;
/* update the indexes, then notify the other end */
virt_wmb();
@@ -288,7 +289,7 @@ static void pvcalls_sk_state_change(struct sock *sock)
return;
intf = map->ring;
intf->in_error = -ENOTCONN;
atomic_inc(&map->read);
notify_remote_via_irq(map->irq);
}