diff options
| author | Alan Cox <alan@linux.intel.com> | 2009-11-30 14:18:35 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-12-12 00:18:08 +0100 |
| commit | f18f9498e90327b9b0e245e191029e6e1996d203 (patch) | |
| tree | f60ba09838bfce3bac5cecf902e8012348490e62 /drivers/char/tty_ldisc.c | |
| parent | tty: push the BKL down into the handlers a bit (diff) | |
| download | linux-f18f9498e90327b9b0e245e191029e6e1996d203.tar.xz linux-f18f9498e90327b9b0e245e191029e6e1996d203.zip | |
tty: Push the lock down further into the ldisc code
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/char/tty_ldisc.c')
| -rw-r--r-- | drivers/char/tty_ldisc.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/drivers/char/tty_ldisc.c b/drivers/char/tty_ldisc.c index d914e77f7f01..3f653f7d849f 100644 --- a/drivers/char/tty_ldisc.c +++ b/drivers/char/tty_ldisc.c @@ -445,8 +445,14 @@ static void tty_set_termios_ldisc(struct tty_struct *tty, int num) static int tty_ldisc_open(struct tty_struct *tty, struct tty_ldisc *ld) { WARN_ON(test_and_set_bit(TTY_LDISC_OPEN, &tty->flags)); - if (ld->ops->open) - return ld->ops->open(tty); + if (ld->ops->open) { + int ret; + /* BKL here locks verus a hangup event */ + lock_kernel(); + ret = ld->ops->open(tty); + unlock_kernel(); + return ret; + } return 0; } @@ -566,6 +572,7 @@ int tty_set_ldisc(struct tty_struct *tty, int ldisc) return 0; } + unlock_kernel(); /* * Problem: What do we do if this blocks ? * We could deadlock here @@ -573,7 +580,6 @@ int tty_set_ldisc(struct tty_struct *tty, int ldisc) tty_wait_until_sent(tty, 0); - unlock_kernel(); mutex_lock(&tty->ldisc_mutex); /* |