[PATCH v3] socket: allow wait=false for client socket

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Commit 767abe7 ("chardev: forbid 'wait' option with client sockets")
is a bit too strict. Current libvirt always set wait=false, and will
thus fail to add client chardev.

Make the code more permissive, allowing wait=false with client socket
chardevs. Deprecate usage of 'wait' with client sockets.

Fixes: 767abe7f49e8be14d29da5db3527817b5d696a52
Cc: Daniel P. Berrangé <berrange@xxxxxxxxxx>
Signed-off-by: Marc-André Lureau <marcandre.lureau@xxxxxxxxxx>
---
 chardev/char-socket.c | 10 +++++++---
 qemu-deprecated.texi  |  5 +++++
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/chardev/char-socket.c b/chardev/char-socket.c
index 3916505d67..ebc1adb83e 100644
--- a/chardev/char-socket.c
+++ b/chardev/char-socket.c
@@ -1263,9 +1263,13 @@ static bool qmp_chardev_validate_socket(ChardevSocket *sock,
             return false;
         }
         if (sock->has_wait) {
-            error_setg(errp, "%s",
-                       "'wait' option is incompatible with "
-                       "socket in client connect mode");
+            warn_report("'wait' option is deprecated with "
+                        "socket in client connect mode");
+            if (sock->wait) {
+                error_setg(errp, "%s",
+                           "'wait' option is incompatible with "
+                           "socket in client connect mode");
+            }
             return false;
         }
     }
diff --git a/qemu-deprecated.texi b/qemu-deprecated.texi
index 2219386769..842e71b11d 100644
--- a/qemu-deprecated.texi
+++ b/qemu-deprecated.texi
@@ -105,6 +105,11 @@ details.
 The ``query-events'' command has been superseded by the more powerful
 and accurate ``query-qmp-schema'' command.
 
+@subsection chardev client socket with 'wait' option (since 4.0)
+
+Character devices creating sockets in client mode should not specify
+the 'wait' field, which is only applicable to sockets in server mode
+
 @section Human Monitor Protocol (HMP) commands
 
 @subsection The hub_id parameter of 'hostfwd_add' / 'hostfwd_remove' (since 3.1)
-- 
2.21.0.313.ge35b8cb8e2

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