tty: hold lock across tty buffer finding and buffer filling
authorXiaobing Tu <xiaobing.tu@intel.com>
Fri, 16 Mar 2012 03:00:26 +0000 (03:00 +0000)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Mon, 9 Apr 2012 19:12:45 +0000 (12:12 -0700)
commitc56a00a165712fd73081f40044b1e64407bb1875
treefee2ca034eb2cc52e6a21880ad875e6d05307d57
parent871bdea6f8c64517635bec352b8bec6b72a26d80
tty: hold lock across tty buffer finding and buffer filling

tty_buffer_request_room is well protected, but while after it returns,
 it releases the port->lock. tty->buf.tail might be modified
by either irq handler or other threads. The patch adds more protection
by holding the lock across tty buffer finding and buffer filling.

Signed-off-by: Alek Du <alek.du@intel.com>
Signed-off-by: Xiaobing Tu <xiaobing.tu@intel.com>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/tty/tty_buffer.c