linux-kernel - Re: [PATCH] Input: ALPS - fix max coordinates for v5 and v7 protocols

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Date:	Sun, 22 Mar 2015 13:33:09 +0100
From:	Pali Rohár <pali.rohar@...il.com>
To:	Hans de Goede <hdegoede@...hat.com>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-input@...r.kernel.org, Santiago Gala <sgala@...che.org>,
	Yunkang Tang <yunkang.tang@...alps.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Input: ALPS - fix max coordinates for v5 and v7 protocols

On Sunday 22 March 2015 11:48:17 Hans de Goede wrote:
> Hi,
> 
> On 22-03-15 04:36, Dmitry Torokhov wrote:
> > Commit 3296f71cd2fde7a2ad52e66a27eae419f6328066 ("Input:
> > ALPS - consolidate setting protocol parameters")
> > inadvertently moved call to alps_dolphin_get_device_area()
> > from v5 to v7 protocol, causing both protocols report
> > incorrect maximum values for X and Y axes which resulted in
> > crash in Synaptics X driver.
> > 
> > Reported-by: Santiago Gala <sgala@...che.org>
> > Reported-by: Pali Rohár <pali.rohar@...il.com>
> > Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
> 
> Fix looks good to me:
> 
> Acked-by: Hans de Goede <hdegoede@...hat.com>
> 
> Regards,
> 
> Hans
> 

Looks good also for me...

Acked-by: Pali Rohár <pali.rohar@...il.com>

> > ---
> > 
> >   drivers/input/mouse/alps.c | 11 ++++++-----
> >   1 file changed, 6 insertions(+), 5 deletions(-)
> > 
> > diff --git a/drivers/input/mouse/alps.c
> > b/drivers/input/mouse/alps.c index 1bd15eb..33198b9 100644
> > --- a/drivers/input/mouse/alps.c
> > +++ b/drivers/input/mouse/alps.c
> > @@ -2281,10 +2281,12 @@ static int alps_set_protocol(struct
> > psmouse *psmouse,
> > 
> >   		priv->set_abs_params = alps_set_abs_params_mt;
> >   		priv->nibble_commands = alps_v3_nibble_commands;
> >   		priv->addr_command = PSMOUSE_CMD_RESET_WRAP;
> > 
> > -		priv->x_max = 1360;
> > -		priv->y_max = 660;
> > 
> >   		priv->x_bits = 23;
> >   		priv->y_bits = 12;
> > 
> > +
> > +		if (alps_dolphin_get_device_area(psmouse, priv))
> > +			return -EIO;
> > +
> > 
> >   		break;
> >   	
> >   	case ALPS_PROTO_V6:
> > @@ -2303,9 +2305,8 @@ static int alps_set_protocol(struct
> > psmouse *psmouse,
> > 
> >   		priv->set_abs_params = alps_set_abs_params_mt;
> >   		priv->nibble_commands = alps_v3_nibble_commands;
> >   		priv->addr_command = PSMOUSE_CMD_RESET_WRAP;
> > 
> > -
> > -		if (alps_dolphin_get_device_area(psmouse, priv))
> > -			return -EIO;
> > +		priv->x_max = 0xfff;
> > +		priv->y_max = 0x7ff;
> > 
> >   		if (priv->fw_ver[1] != 0xba)
> >   		
> >   			priv->flags |= ALPS_BUTTONPAD;


-- 
Pali Rohár
pali.rohar@...il.com

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