>       serial: use tty_port pointers in the core code

-tip testing found a weird serial code related crash on a testbox: the 
box does spontaneous reboot during the user-space portions of bootup. 
There's nothing in the serial log, but i've been able to bisect it to:

 | 46d57a449aa13d9c6adcc9d1dbc7b9a0ecfb69d8 is first bad commit
 | commit 46d57a449aa13d9c6adcc9d1dbc7b9a0ecfb69d8
 | Author: Alan Cox <alan@linux.intel.com>
 | Date:   Sat Sep 19 13:13:29 2009 -0700
 |
 |    serial: use tty_port pointers in the core code

A revert looks rather impossible due to how the changes are layered on 
each other. Can try any test-patch.

Here's the bisection log:

 # good: [74fca6a4] Linux 2.6.31
 # bad:  [17d857be] Linux 2.6.32-rc1
 # good: [5d1fe0c9] Staging: vt6656: Integrate vt6656 into build syste
 # bad:  [c720f565] Merge branch 'for_linus' of git://git.kernel.org/p
 # good: [a03fdb76] Merge branch 'timers-for-linus' of git://git.kerne
 # good: [3530c188] Merge branch 'for_linus' of git://git.kernel.org/p
 # good: [84d6ae43] V4L/DVB (13033): pt1: Don't use a deprecated DMA_B
 # bad:  [ebc79c4f] Merge git://git.kernel.org/pub/scm/linux/kernel/gi
 # bad:  [7bd032dc] USB serial: update the console driver
 # good: [4455e344] tty: USB can now use the shutdown method for kref 
 # bad:  [ee5aa7b8] n_tty: honor opost flag for echoes
 # bad:  [91312cdb] serial: move count into the tty_port version
 # good: [a509a7e4] tty: USB does not need the filp argument in the dr
 # good: [ebd2c8f6] serial: kill off uart_info
 # bad:  [46d57a44] serial: use tty_port pointers in the core code
 # good: [5e99df56] serial: Fold closing_* fields into the tty_port on

Config and a serial log up to the spontaneous reboot attached.

	Ingo