On Tue, 2007-01-02 at 18:38 +0000, Alan wrote:
> > with tty->low_latency set, but it doesn't AFAICS. One possibility
> for
> > deadlock is if the tty->buf.lock spinlock is taken on behalf of a
> user
> > process...
>
> The case to watch out for is
>
> flip_buffer_push -> ldisc -> driver write of echo/^S/^Q
>
> if you call flip_buffer_push while holding your own lock you may get
> in a mess on the echo path.
Agreed. However, that's not what the comment says:
* tty_flip_buffer_push - terminal
* @tty: tty to push
*
* Queue a push of the terminal flip buffers to the line discipline. This
* function must not be called from IRQ context if tty->low_latency is set.
--
Hollis Blanchard
IBM Linux Technology Center
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