From: Peter Hurley <peter@hurleysoftware.com>
Date: Thu, 16 Oct 2014 20:54:27 +0000 (-0400)
Subject: serial: core: Fix port count when uart_open() errors
X-Git-Tag: omap-for-v3.19/fixes-rc1~86^2~158
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=91b32f5413c17e80ac6616dd9c62e826fa438e2d;p=pandora-kernel.git

serial: core: Fix port count when uart_open() errors

A port count mismatch occurs if mutex_lock_interruptible()
exits uart_open() and the port has already been opened. This may
prematurely close a port on an open tty. Since uart_close() is _always_
called if uart_open() fails, the port count must be corrected if errors
occur.

Always increment the port count in uart_open(), regardless of errors;
always decrement the port count in uart_close(). Note that
tty_port_close_start() decrements the port count when uart_open()
was successful.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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