From: Johan Hovold <jhovold@gmail.com>
Date: Tue, 19 Mar 2013 08:21:10 +0000 (+0100)
Subject: USB: serial: add modem-status-change wait queue
X-Git-Tag: v3.2.44~75
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=da07f4596510e8141e105c9502a25b568caba860;p=pandora-kernel.git

USB: serial: add modem-status-change wait queue

commit e5b33dc9d16053c2ae4c2c669cf008829530364b upstream.

Add modem-status-change wait queue to struct usb_serial_port that
subdrivers can use to implement TIOCMIWAIT.

Currently subdrivers use a private wait queue which may have been
released when waking up after device disconnected.

Note that we're adding a new wait queue rather than reusing the tty-port
one as we do not want to get woken up at hangup (yet).

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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