linux-kernel - Re: [PATCH 2/2] HID: core: only warn once of oversize hid report

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Message-ID: <f7b1a46569a7208eb2be3b5cc3432b0aa97fc3ee.camel@perches.com>
Date:   Mon, 22 Jul 2019 10:23:00 -0700
From:   Joe Perches <joe@...ches.com>
To:     stillcompiling@...il.com, 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>
Subject: Re: [PATCH 2/2] HID: core: only warn once of oversize hid report

On Mon, 2019-07-22 at 10:36 -0600, stillcompiling@...il.com wrote:
> 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 other kernel logs
> Protect dmesg by printing the warning only one time.
[]
> diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
[]
> @@ -1311,7 +1311,7 @@ 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",
> +		hid_warn_once(hid, "hid_field_extract() called with n (%d) > 32! (%s)\n",
>  			 n, current->comm);
>  		n = 32;
>  	}

Is this papering over an actual defect somewhere else?
Trivially, this could use "%s: ...", __func__, ...