On Tue, Sep 03, 2013 at 09:39:10PM +0400, Andrey Moiseev wrote:
> Here is an extract from drivers/input/serio/i8042.c:
> >
> > static int i8042_flush(void)
> > {
> > unsigned long flags;
> > unsigned char data, str;
> > int i = 0;
> >
> > spin_lock_irqsave(&i8042_lock, flags);
> >
> > while (((str = i8042_read_status()) & I8042_STR_OBF) && (i <
> > I8042_BUFFER_SIZE)) {
> > udelay(50);
> > data = i8042_read_data();
> > i++;
> > dbg("%02x <- i8042 (flush, %s)\n",
> > data, str & I8042_STR_AUXDATA ? "aux" : "kbd");
> > }
> >
> > spin_unlock_irqrestore(&i8042_lock, flags);
> >
> > return i;
> > }
> >
> > static int i8042_controller_check(void)
> > {
> > if (i8042_flush() == I8042_BUFFER_SIZE) {
> Doesn't it panic needlessly, while the buffer was initially full?
It appears so. We probably want to change it to return -1 if we still
see OBF after fetching I8042_BUFFER_SIZE characters.
Thanks.
--
Dmitry
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