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(parent: 2e223d9) | patch
tty-ldisc: be more careful in 'put_ldisc' locking
authorLinus Torvalds <torvalds@linux-foundation.org>
Mon, 3 Aug 2009 21:54:56 +0000 (14:54 -0700)
committerGreg Kroah-Hartman <gregkh@suse.de>
Tue, 4 Aug 2009 20:46:30 +0000 (13:46 -0700)
commita7415771d7e61e25b5ce83b27cd50e9b7f86a207
tree960187b610e13e5ef7f461397bd0846a36221436tree | snapshot
parent2e223d98c59573fcea36e2b3b27aae7a01f5d435commit | diff
tty-ldisc: be more careful in 'put_ldisc' locking

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>
drivers/char/tty_ldisc.c diff | blob | history
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