From 36ba782e9674cdc29ec7003757df0b375e99fa96 Mon Sep 17 00:00:00 2001 From: Alan Cox Date: Mon, 30 Nov 2009 13:18:51 +0000 Subject: [PATCH] tty: split the lock up a bit further The tty count sanity check may need the BKL, that isn't clear. However it is clear that the count use of the lock is internal and independant of the bigger use of the lock. Furthermore the file list locking is also separately locked already Signed-off-by: Alan Cox Signed-off-by: Greg Kroah-Hartman --- drivers/char/tty_io.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c index a19fef2..684f0e0 100644 --- a/drivers/char/tty_io.c +++ b/drivers/char/tty_io.c @@ -516,6 +516,8 @@ static void do_tty_hangup(struct work_struct *work) /* inuse_filps is protected by the single kernel lock */ lock_kernel(); check_tty_count(tty, "do_tty_hangup"); + unlock_kernel(); + file_list_lock(); /* This breaks for file handles being sent over AF_UNIX sockets ? */ list_for_each_entry(filp, &tty->tty_files, f_u.fu_list) { @@ -529,6 +531,7 @@ static void do_tty_hangup(struct work_struct *work) } file_list_unlock(); + lock_kernel(); tty_ldisc_hangup(tty); read_lock(&tasklist_lock); -- 2.7.4