Re: [PATCH] Input - elantech: fix debug dump of the current packet

Dmitry Torokhov
2016-07-28T18:40:09Z

On Thu, Jul 28, 2016 at 11:30:56AM -0700, Joe Perches wrote:
> On Thu, 2016-07-28 at 11:58 +0200, Benjamin Tissoires wrote:
> > The use of mixed psmouse_printk() and printk creates 2 lines in the log,
> > while the use of %*ph solves everything.
> >
> > Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
> > ---
> >  drivers/input/mouse/elantech.c | 8 ++------
> >  1 file changed, 2 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/input/mouse/elantech.c b/drivers/input/mouse/elantech.c
> > index 615d23e..3461d04 100644
> > --- a/drivers/input/mouse/elantech.c
> > +++ b/drivers/input/mouse/elantech.c
> > @@ -222,12 +222,8 @@ static int elantech_write_reg(struct psmouse *psmouse, unsigned char reg,
> >   */
> >  static void elantech_packet_dump(struct psmouse *psmouse)
> >  {
> > - int i;
> > -
> > - psmouse_printk(KERN_DEBUG, psmouse, "PS/2 packet [");
> > - for (i = 0; i < psmouse->pktsize; i++)
> > - printk("%s0x%02x ", i ? ", " : " ", psmouse->packet[i]);
> > - printk("]\n");
> > + psmouse_printk(KERN_DEBUG, psmouse, "PS/2 packet [%*ph]",
> > +        psmouse->pktsize, psmouse->packet);
> >  }
> >
> >  /*
>
> This should add a newline "\n" format termination but

I added it, thanks for alerting me.

> how does the original produce multiple lines of output?
>
> It looks more like psmouse_printk should be removed altogether
> and dev_debug should be used instead.

That does not produce output by default whereas elantech driver uses
elantech_packet_dump() to drop unexpected packets.

Thanks.

--
Dmitry