linux-kernel - Re: [patch] HID: wacom: Don't clear bits unintentionally

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Message-ID: <56caefcd-93d6-201d-f597-2d651cbe68ba@gmail.com>
Date:   Mon, 14 Nov 2016 10:31:52 -0800
From:   Jason Gerecke <killertofu@...il.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>,
        Jiri Kosina <jikos@...nel.org>
Cc:     Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Henrik Rydberg <rydberg@...math.org>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [patch] HID: wacom: Don't clear bits unintentionally

On 11/10/2016 11:25 AM, Dan Carpenter wrote:
> This is trying to clear the lower 32 bits but the type is wrong so it
> clears everything.
> 
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> 

Reviewed-by: Jason Gerecke <jason.gerecke@...om.com>

Jason
---
Now instead of four in the eights place /
you’ve got three, ‘Cause you added one /
(That is to say, eight) to the two, /
But you can’t take seven from three, /
So you look at the sixty-fours....

> diff --git a/drivers/hid/wacom_wac.c b/drivers/hid/wacom_wac.c
> index 0723ba8..1cf4608 100644
> --- a/drivers/hid/wacom_wac.c
> +++ b/drivers/hid/wacom_wac.c
> @@ -1765,7 +1765,7 @@ static int wacom_wac_pen_event(struct hid_device *hdev, struct hid_field *field,
>  		wacom_wac->hid_data.tipswitch |= value;
>  		return 0;
>  	case HID_DG_TOOLSERIALNUMBER:
> -		wacom_wac->serial[0] = (wacom_wac->serial[0] & ~0xFFFFFFFF);
> +		wacom_wac->serial[0] = (wacom_wac->serial[0] & ~0xFFFFFFFFULL);
>  		wacom_wac->serial[0] |= value;
>  		return 0;
>  	case WACOM_HID_WD_SENSE:
> --