tty: n_smux: add separate close notifications
When an SMUX port state is closed, the close request is sent to the
remote system. The port cannot be re-opened until the remote system
acknowledges the close request. If the client attempts to re-open the
port during this time, then the -EAGAIN error code is returned and the
client must keep retrying to open the port. An event-driven approach
would be better, but the client does not receive local state
notifications, so this is not possible.
Add local and remote closed notifications so clients can handle the
closing state transitions without using polling.
CRs-Fixed: 510114
Change-Id: I48008804d23dbfd05df0becd4bc1c695e599a835
Signed-off-by: Arun Kumar Neelakantam <aneela@codeaurora.org>
diff --git a/include/linux/smux.h b/include/linux/smux.h
index 56b18fa..1157cef 100644
--- a/include/linux/smux.h
+++ b/include/linux/smux.h
@@ -1,6 +1,6 @@
/* include/linux/smux.h
*
- * Copyright (c) 2012, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
@@ -79,6 +79,8 @@
SMUX_HIGH_WM_HIT, /* @metadata is NULL */
SMUX_RX_RETRY_HIGH_WM_HIT, /* @metadata is NULL */
SMUX_RX_RETRY_LOW_WM_HIT, /* @metadata is NULL */
+ SMUX_LOCAL_CLOSED,
+ SMUX_REMOTE_CLOSED,
};
/**