linux-kernel - Re: [PATCH] HID: rmi: use HID_QUIRK_NO_INPUT

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Date:   Mon, 28 May 2018 18:38:00 +0200
From:   Benjamin Tissoires <benjamin.tissoires@...hat.com>
To:     Jiri Kosina <jikos@...nel.org>,
        Andrew Duggan <aduggan@...aptics.com>
Cc:     Oscar Morante <spacepluk@...il.com>,
        Peter Hutterer <peter.hutterer@...-t.net>,
        "open list:HID CORE LAYER" <linux-input@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>
Subject: Re: [PATCH] HID: rmi: use HID_QUIRK_NO_INPUT_SYNC

On Fri, May 25, 2018 at 2:51 PM, Benjamin Tissoires
<benjamin.tissoires@...hat.com> wrote:
> When we receive a RMI4 report, we should not unconditionally send an
> input_sync event. Instead, we should let the rmi4 transport layer do it
> for us.
>
> This fixes a situation where we might receive X in a report and the rest
> in a subsequent one. And this messes up user space.
>
> Link: https://bugs.freedesktop.org/show_bug.cgi?id=100436
>
> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
> ---
>
> Hi,
>
> Oscar, do you mind if we add your "Tested-by: Oscar Morante <your@...il>"?

As mentioned in comment 25 of the bug above
(https://bugs.freedesktop.org/show_bug.cgi?id=100436#c25), oscar is
fine adding his tested-by line.

Cheers,
Benjamin

>
> Andrew, can you check for any sides effects please?
>
> Cheers,
> Benjamin
>
>  drivers/hid/hid-rmi.c | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
>
> diff --git a/drivers/hid/hid-rmi.c b/drivers/hid/hid-rmi.c
> index 9c9362149641..9e33165250a3 100644
> --- a/drivers/hid/hid-rmi.c
> +++ b/drivers/hid/hid-rmi.c
> @@ -413,6 +413,24 @@ static int rmi_event(struct hid_device *hdev, struct hid_field *field,
>         return 0;
>  }
>
> +static void rmi_report(struct hid_device *hid, struct hid_report *report)
> +{
> +       struct hid_field *field = report->field[0];
> +
> +       if (!(hid->claimed & HID_CLAIMED_INPUT))
> +               return;
> +
> +       switch (report->id) {
> +       case RMI_READ_DATA_REPORT_ID:
> +               /* fall-through */
> +       case RMI_ATTN_REPORT_ID:
> +               return;
> +       }
> +
> +       if (field && field->hidinput && field->hidinput->input)
> +               input_sync(field->hidinput->input);
> +}
> +
>  #ifdef CONFIG_PM
>  static int rmi_suspend(struct hid_device *hdev, pm_message_t message)
>  {
> @@ -637,6 +655,7 @@ static int rmi_probe(struct hid_device *hdev, const struct hid_device_id *id)
>         hid_set_drvdata(hdev, data);
>
>         hdev->quirks |= HID_QUIRK_NO_INIT_REPORTS;
> +       hdev->quirks |= HID_QUIRK_NO_INPUT_SYNC;
>
>         ret = hid_parse(hdev);
>         if (ret) {
> @@ -744,6 +763,7 @@ static struct hid_driver rmi_driver = {
>         .remove                 = rmi_remove,
>         .event                  = rmi_event,
>         .raw_event              = rmi_raw_event,
> +       .report                 = rmi_report,
>         .input_mapping          = rmi_input_mapping,
>         .input_configured       = rmi_input_configured,
>  #ifdef CONFIG_PM
> --
> 2.14.3
>