From: Johan Hovold <jhovold@gmail.com>
Date: Thu, 21 Mar 2013 11:36:53 +0000 (+0100)
Subject: USB: serial: wake up MSR-wait queue on disconnect
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~135^2~173
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c371de14b9a23aadb57accab0ca2e5dd28de7f16;p=pandora-kernel.git

USB: serial: wake up MSR-wait queue on disconnect

Make sure processes waiting for modem-status changes are woken up at
disconnect.

This is needed for custom subdriver TIOCMIWAIT-implementations which do
not yet handle hangup.

Even though processes on the tty-port wait queue are woken up at hangup
the wake-up call in usb-serial disconnect is still needed if a woken-up
process may go back to sleep (e.g. due to an incomplete
TIOCMIWAIT-implementation). If a disconnect occurs after a hangup, any
process waiting for changes will not be woken up a second time by the
tty-layer as the port will then have been disassociated from the tty.

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