tree 9649ffd431eb8dc97fbad83d47feaed96980cb7e
parent ec79d6056de58511d8e46d9ae59d3878f958dc3e
author Arnd Bergmann <arnd@arndb.de> 1275425582 +0200
committer Greg Kroah-Hartman <gregkh@suse.de> 1281473263 -0700

tty: never hold BTM while getting tty_mutex

tty_mutex is never taken with the BTM held, except for
two corner cases that are worked around here.
We give up the BTM before calling tty_release() in the
error path of tty_open().
Similarly, we reorder the locking in ptmx_open()
to get tty_mutex before the BTM.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>