On Tue, 04 Dec 2012 17:10:57 +0400 Ilya Zykov <ilya@xxxxxxx> wrote: > The root of problem is carelessly zeroing pointer(in function __tty_buffer_flush()), > when another thread can use it. It can be cause of "NULL pointer dereference". > Main idea of the patch, this is never free last (struct tty_buffer) in the active buffer. > Only flush the data for ldisc(tty->buf.head->read = tty->buf.head->commit). > At that moment driver can collect(write) data in buffer without conflict. > It is repeat behavior of flush_to_ldisc(), only without feeding data to ldisc. > > Also revert: > commit c56a00a165712fd73081f40044b1e64407bb1875 > tty: hold lock across tty buffer finding and buffer filling > In order to delete the unneeded locks any more. > > Signed-off-by: Ilya Zykov <ilya@xxxxxxx> Acked-by: Alan Cox <alan@xxxxxxxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
