From: Bill Pemberton <wfp5p@virginia.edu>
Date: Wed, 13 Mar 2013 13:50:15 +0000 (-0400)
Subject: USB: quatech2: only write to the tty if the port is open.
X-Git-Tag: v3.9-rc3~17^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=27b351c5546008c640b3e65152f60ca74b3706f1;p=pandora-kernel.git

USB: quatech2: only write to the tty if the port is open.

The commit 2e124b4a390ca85325fae75764bef92f0547fa25 removed the checks
that prevented qt2_process_read_urb() from trying to put chars into
ttys that weren't actually opened.  This resulted in 'tty is NULL'
warnings from flush_to_ldisc() when the device was used.

The devices use just one read urb for all ports.  As a result
qt2_process_read_urb() may be called with the current port set to a
port number that has not been opened.  Add a check if the port is open
before calling tty_flip_buffer_push().

Signed-off-by: Bill Pemberton <wfp5p@virginia.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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