[xen staging] tools/libvchan: notify server when client is connected

[patchbot@xxxxxxx]

commit dae844977e1e10dc859ec21612f1811ca5d5f128
Author:     Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
AuthorDate: Mon May 18 21:54:53 2020 -0400
Commit:     Wei Liu <wl@xxxxxxx>
CommitDate: Tue May 19 16:19:15 2020 +0100

    tools/libvchan: notify server when client is connected
    
    Let the server know when the client is connected. Otherwise server will
    notice only when client send some data.
    This change does not break existing clients, as libvchan user should
    handle spurious notifications anyway (for example acknowledge of remote
    side reading the data).
    
    Cc: Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>
    Signed-off-by: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
    Replace spaces with tabs to match the file's whitespace.
    Signed-off-by: Jason Andryuk <jandryuk@xxxxxxxxx>
    Acked-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
---
 tools/libvchan/init.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/libvchan/init.c b/tools/libvchan/init.c
index 180833dc2f..ad4b64fbe3 100644
--- a/tools/libvchan/init.c
+++ b/tools/libvchan/init.c
@@ -447,6 +447,9 @@ struct libxenvchan *libxenvchan_client_init(struct 
xentoollog_logger *logger,
        ctrl->ring->cli_live = 1;
        ctrl->ring->srv_notify = VCHAN_NOTIFY_WRITE;
 
+       /* wake up the server */
+       xenevtchn_notify(ctrl->event, ctrl->event_port);
+
  out:
        if (xs)
                xs_daemon_close(xs);
--
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