tty-ldisc: be more careful in 'put_ldisc' locking

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Use 'atomic_dec_and_lock()' to make sure that we always hold the
tty_ldisc_lock when the ldisc count goes to zero. That way we can never
race against 'tty_ldisc_try()' increasing the count again.

Reported-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Tested-by: Sergey Senozhatsky <sergey.senozhatsky@mail.by>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

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Linus Torvalds 2009-08-03 14:54:56 -07:00 • committed by Greg Kroah-Hartman

parent 65b770468e

commit cbe9352fa0

1 changed files with 12 additions and 5 deletions

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drivers/char/tty_ldisc.c

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