[PATCH] serial: PL011: clear pending interrupts

[Kim, Jong-Sung]

> On Mon, Mar 12, 2012 at 08:32:21AM +0000, Russell King - ARM Linux wrote:
> > On Mon, Mar 12, 2012 at 09:25:50AM +0100, Linus Walleij wrote:
> > > diff --git a/drivers/tty/serial/amba-pl011.c
> > > b/drivers/tty/serial/amba-pl011.c index 6800f5f..ff3fed0 100644
> > > --- a/drivers/tty/serial/amba-pl011.c
> > > +++ b/drivers/tty/serial/amba-pl011.c
> > > @@ -224,6 +224,11 @@ static int pl011_fifo_to_tty(struct
uart_amba_port
> *uap)
> > >  		uart_insert_char(&uap->port, ch, UART011_DR_OE, ch, flag);
> > >  	}
> > >
> >
> > What if we really do end up receiving some characters here?
> >
> > > +	/* RXIS but RXFE? Just clear the interrupt */
> > > +	if(unlikely(fifotaken == 0))
> > > +		writew(UART011_RTIS | UART011_RXIS,
> > > +		       uap->port.membase + UART011_ICR);
> 
> BTW, I don't see why we need any of this stuff.

Actually, I meant my patch applied alone, not with your patch. My thought
was the problem we're trying to handle is undocumented and is not guaranteed
not to happen again.