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From: Arnd Bergmann on 5 May 2010 05:20
On Wednesday 05 May 2010, Arnd Bergmann wrote:
> This fixes the lock order of the BTM and
> ldisc_mutex so that we never take the BTM
> while holding ldisc_mutex, which means
> we no longer have to use mutex_lock_tty
> when getting ldisc_mutex.
>
> Signed-off-by: Arnd Bergmann <arnd(a)arndb.de>

Ignore this one, I just realized that we're releasing
and reacquiring the BTM in tty_ldisc_halt,
tty_set_termios_ldisc and possibly others.

This patch needs more work to make that possible.

Arnd
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