linux-kernel - Re: [PATCH v3 3/3] HID: core: fix dmesg flooding if report field larger than 32bit

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Message-ID: <CAMB+bfK9Oge1T96aJkuvpoAdUSsm+YxY1W70b62gUMMBKfD8vg@mail.gmail.com>
Date:   Wed, 28 Aug 2019 17:26:18 -0600
From:   Joshua Clayton <stillcompiling@...il.com>
To:     Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        "open list:HID CORE LAYER" <linux-input@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Cc:     Joe Perches <joe@...ches.com>
Subject: Re: [PATCH v3 3/3] HID: core: fix dmesg flooding if report field
 larger than 32bit

ping?
I'd love to see this get in.
with distro kernel I have effectively no dmesg due to this issue

On Mon, Aug 12, 2019 at 9:20 AM <stillcompiling@...il.com> wrote:
>
> From: Joshua Clayton <stillcompiling@...il.com>
>
> Only warn once of oversize hid report value field
>
> On HP spectre x360 convertible the message:
> hid-sensor-hub 001F:8087:0AC2.0002: hid_field_extract() called with n (192) > 32! (kworker/1:2)
> is continually printed many times per second, crowding out all else.
> Protect dmesg by printing the warning only one time.
>
> The size of the hid report field data structure should probably be increased.
> The data structure is treated as a u32 in Linux, but an unlimited number
> of bits in the USB hid spec, so there is some rearchitecture needed now that
> devices are sending more than 32 bits.
>
> Signed-off-by: Joshua Clayton <stillcompiling@...il.com>
>
> diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
> index 210b81a56e1a..3eaee2c37931 100644
> --- a/drivers/hid/hid-core.c
> +++ b/drivers/hid/hid-core.c
> @@ -1311,8 +1311,8 @@ u32 hid_field_extract(const struct hid_device *hid, u8 *report,
>                         unsigned offset, unsigned n)
>  {
>         if (n > 32) {
> -               hid_warn(hid, "hid_field_extract() called with n (%d) > 32! (%s)\n",
> -                        n, current->comm);
> +               hid_warn_once(hid, "%s() called with n (%d) > 32! (%s)\n",
> +                             __func__, n, current->comm);
>                 n = 32;
>         }
>
> --
> 2.21.0
>