On 04.12.2012 12:53, Alan Cox wrote: >> Main idea here - we never flash last (struct tty_buffer) in the >> active buffer. Only data for ldisc. (tty->buf.head->read = >> tty->buf.head->commit). At that moment driver can collect(write) data >> in buffer without conflict. > > This one I agree with (sorry it took a while to get to, I wanted to sit > and think carefully about it as it is subtle and clever) > > Can you generate a single patch which reverts the unneeded locks and > adds this instead. Add a Signed-off-by and send it to Greg to get it > into 3.8/3.9 somewhere. > > Thanks > > Alan >
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