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    SubjectRe: [PATCH] kdesu broken

    On Wed, 29 Jul 2009, Alan Cox wrote:

    > > The tty_ldisc_hangup() already does tty_ldisc_wait_idle() after disabling
    > > the timer (and clearing the TTY_LDISC bit), so that all seems fine
    > > already. No?
    > We only do tty_ldisc_wait_idle if tty->driver->flags & TTY_RESET_TERMIOS
    > is set that I can see ?

    I agree, but that's also the only time we do that 'tty_ldisc_halt()' that
    cancels the timer. So if there is something that depends on the
    flush_to_ldisc() not happening, the bug was pre-existing since it never
    got rid of the flush to begin with, so the flush_to_ldisc() would happen
    at some random later time as a result of the delayed-work timer.

    That said, I suspect that from a sanity standpoint, I suspect something
    like the appended migth be a good idea. But I think it's an independent
    issue (and unless somebody can actually point to an actual problem, I'd
    only apply something like this during the merge window, not after -rc4).

    drivers/char/tty_ldisc.c | 4 ++--
    1 files changed, 2 insertions(+), 2 deletions(-)

    diff --git a/drivers/char/tty_ldisc.c b/drivers/char/tty_ldisc.c
    index acd76b7..640b100 100644
    --- a/drivers/char/tty_ldisc.c
    +++ b/drivers/char/tty_ldisc.c
    @@ -778,6 +778,8 @@ void tty_ldisc_hangup(struct tty_struct *tty)
    if (ld->ops->hangup)
    + tty_ldisc_halt(tty);
    + tty_ldisc_wait_idle(tty);
    * FIXME: Once we trust the LDISC code better we can wait here for
    @@ -794,8 +796,6 @@ void tty_ldisc_hangup(struct tty_struct *tty)
    if (tty->ldisc) { /* Not yet closed */
    /* Switch back to N_TTY */
    - tty_ldisc_halt(tty);
    - tty_ldisc_wait_idle(tty);
    /* At this point we have a closed ldisc and we want to
    reopen it. We could defer this to the next open but

     \ /
      Last update: 2009-10-18 23:28    [W:0.025 / U:50.484 seconds]
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