linux-kernel - Re: [PATCH] Input: cros_ec_keyb: Add back missing mask for event

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Date:   Tue, 13 Aug 2019 17:47:22 +0800
From:   Nicolas Boichat <drinkcat@...omium.org>
To:     Fei Shao <fshao@...omium.org>
Cc:     linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Benson Leung <bleung@...omium.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Guenter Roeck <groeck@...omium.org>,
        Ting Shen <phoenixshen@...omium.org>,
        Brian Norris <briannorris@...omium.org>,
        "open list:HID CORE LAYER" <linux-input@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Input: cros_ec_keyb: Add back missing mask for event_type

On Tue, Aug 13, 2019 at 5:38 PM Fei Shao <fshao@...omium.org> wrote:
>
> In the previous patch we didn't mask out event_type in case statement,
> so switches are always picked instead of buttons, which results in
> ChromeOS devices misbehaving when power button is pressed.
> This patch adds back the missing mask.
>
> Fixes: d096aa3eb604 ("Input: cros_ec_keyb: mask out extra flags in event_type")
> Signed-off-by: Fei Shao <fshao@...omium.org>

Reviewed-by: Nicolas Boichat <drinkcat@...omium.org>

> ---
>  drivers/input/keyboard/cros_ec_keyb.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/input/keyboard/cros_ec_keyb.c b/drivers/input/keyboard/cros_ec_keyb.c
> index 38cb6d82d8fe..bef7bee6f05e 100644
> --- a/drivers/input/keyboard/cros_ec_keyb.c
> +++ b/drivers/input/keyboard/cros_ec_keyb.c
> @@ -226,6 +226,8 @@ static int cros_ec_keyb_work(struct notifier_block *nb,
>  {
>         struct cros_ec_keyb *ckdev = container_of(nb, struct cros_ec_keyb,
>                                                   notifier);
> +       uint8_t mkbp_event_type = ckdev->ec->event_data.event_type &
> +                                 EC_MKBP_EVENT_TYPE_MASK;
>         u32 val;
>         unsigned int ev_type;
>
> @@ -237,7 +239,7 @@ static int cros_ec_keyb_work(struct notifier_block *nb,
>         if (queued_during_suspend && !device_may_wakeup(ckdev->dev))
>                 return NOTIFY_OK;
>
> -       switch (ckdev->ec->event_data.event_type & EC_MKBP_EVENT_TYPE_MASK) {
> +       switch (mkbp_event_type) {
>         case EC_MKBP_EVENT_KEY_MATRIX:
>                 pm_wakeup_event(ckdev->dev, 0);
>
> @@ -264,7 +266,7 @@ static int cros_ec_keyb_work(struct notifier_block *nb,
>         case EC_MKBP_EVENT_SWITCH:
>                 pm_wakeup_event(ckdev->dev, 0);
>
> -               if (ckdev->ec->event_data.event_type == EC_MKBP_EVENT_BUTTON) {
> +               if (mkbp_event_type == EC_MKBP_EVENT_BUTTON) {
>                         val = get_unaligned_le32(
>                                         &ckdev->ec->event_data.data.buttons);
>                         ev_type = EV_KEY;
> --
> 2.23.0.rc1.153.gdeed80330f-goog