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

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Date:	Sun, 22 Mar 2015 11:48:17 +0100
From:	Hans de Goede <hdegoede@...hat.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-input@...r.kernel.org
CC:	Pali Rohár <pali.rohar@...il.com>,
	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

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


> ---
>   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;
>
--
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