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tty ldisc: Close/Reopen race prevention should check the proper flag 

Commit acfa747b introduced the TTY_HUPPING flag to distinguish
closed TTY from currently closing ones. The test in tty_set_ldisc
still remained pointing at the old flag. This causes pppd to
sometimes lapse into uninterruptible sleep when killed and
restarted.

Signed-off-by: Shachar Shemesh <shachar@liveu.tv>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Shachar Shemesh 2012-07-10 07:54:13 +03:00 committed by Greg Kroah-Hartman
parent 2588aba002
commit aa3c8af863
1 changed files with 1 additions and 1 deletions
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2
drivers/tty/tty_ldisc.c
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@ -659,7 +659,7 @@ int tty_set_ldisc(struct tty_struct *tty, int ldisc)
goto enable;
}
if (test_bit(TTY_HUPPED, &tty->flags)) {
if (test_bit(TTY_HUPPING, &tty->flags)) {
/* We were raced by the hangup method. It will have stomped
the ldisc data and closed the ldisc down */
clear_bit(TTY_LDISC_CHANGING, &tty->flags);