Re: [PATCH] Use tty_schedule in VT code.

[James Simmons]

> > What should be done is 
> > 
> >         if (tty->low_latency)
> >                 flush_to_ldisc(&tty->buf.work.work);
> >         else
> >                 schedule_delayed_work(&tty->buf.work, 1);
> > 
> > Is this acceptable to you?
> 
> In that case, we might as well just always do the scheduled_delayed_work() 
> with a zero timeout as per the earlier patch. I'd still like to know who 
> *cares*, though? Why not leave it at 1?
I have no problem leaving at one. Here is the new patch. I did address the 
problem with tty_flip_buffer_push in this patch. It is possible for a 
driver to call tty_flip_buffer_push within a interrupt context if they
set the low_latency flag.

diff --git a/drivers/char/keyboard.c b/drivers/char/keyboard.c
index 2ce0af1..68eab40 100644
--- a/drivers/char/keyboard.c
+++ b/drivers/char/keyboard.c
@@ -278,7 +278,7 @@ static void put_queue(struct vc_data *vc, int ch)
 
        if (tty) {
                tty_insert_flip_char(tty, ch, 0);
-               con_schedule_flip(tty);
+               tty_schedule_flip(tty);
        }
 }
 
@@ -293,7 +293,7 @@ static void puts_queue(struct vc_data *vc, char *cp)
                tty_insert_flip_char(tty, *cp, 0);
                cp++;
        }
-       con_schedule_flip(tty);
+       tty_schedule_flip(tty);
 }
 
 static void applkey(struct vc_data *vc, int key, char mode)
@@ -533,7 +533,7 @@ static void fn_send_intr(struct vc_data *vc)
        if (!tty)
                return;
        tty_insert_flip_char(tty, 0, TTY_BREAK);
-       con_schedule_flip(tty);
+       tty_schedule_flip(tty);
 }
 
 static void fn_scroll_forw(struct vc_data *vc)
diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index de37ebc..8533173 100644
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -3647,11 +3647,7 @@ void tty_flip_buffer_push(struct tty_struct *tty)
        if (tty->buf.tail != NULL)
                tty->buf.tail->commit = tty->buf.tail->used;
        spin_unlock_irqrestore(&tty->buf.lock, flags);
-
-       if (tty->low_latency)
-               flush_to_ldisc(&tty->buf.work.work);
-       else
-               schedule_delayed_work(&tty->buf.work, 1);
+       schedule_delayed_work(&tty->buf.work, 1);
 }
 
 EXPORT_SYMBOL(tty_flip_buffer_push);
diff --git a/drivers/char/vt.c b/drivers/char/vt.c
index edb7002..d17cfcd 100644
--- a/drivers/char/vt.c
+++ b/drivers/char/vt.c
@@ -1260,7 +1260,7 @@ static void respond_string(const char *p, struct 
tty_struct *tty)
                tty_insert_flip_char(tty, *p, 0);
                p++;
        }
-       con_schedule_flip(tty);
+       tty_schedule_flip(tty);
 }
 
 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
diff --git a/include/linux/kbd_kern.h b/include/linux/kbd_kern.h
index 506ad20..7b24a0d 100644
--- a/include/linux/kbd_kern.h
+++ b/include/linux/kbd_kern.h
@@ -149,16 +149,4 @@ void compute_shiftstate(void);
 
 extern unsigned int keymap_count;
 
-/* console.c */
-
-static inline void con_schedule_flip(struct tty_struct *t)
-{
-       unsigned long flags;
-       spin_lock_irqsave(&t->buf.lock, flags);
-       if (t->buf.tail != NULL)
-               t->buf.tail->commit = t->buf.tail->used;
-       spin_unlock_irqrestore(&t->buf.lock, flags);
-       schedule_delayed_work(&t->buf.work, 0);
-}
-
 #endif
-
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