linux-kernel - Re: [PATCH 5/5] firmware: add DECLARE_FW_CUSTOM

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Date:   Fri, 16 Dec 2016 09:19:47 -0600
From:   "Luis R. Rodriguez" <mcgrof@...nel.org>
To:     Pavel Machek <pavel@....cz>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Ming Lei <ming.lei@...onical.com>,
        Daniel Wagner <daniel.wagner@...-carit.de>,
        Tom Gundersen <teg@...m.no>,
        Mauro Carvalho Chehab <mchehab@....samsung.com>,
        Rafał Miłecki <zajec5@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Vikram Mulukutla <markivx@...eaurora.org>,
        Stephen Boyd <stephen.boyd@...aro.org>,
        Mark Brown <broonie@...nel.org>,
        Mimi Zohar <zohar@...ux.vnet.ibm.com>,
        Takashi Iwai <tiwai@...e.de>,
        Johannes Berg <johannes@...solutions.net>,
        Christian Lamparter <chunkeey@...glemail.com>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        Josh Boyer <jwboyer@...oraproject.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Jiri Slaby <jslaby@...e.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andy Lutomirski <luto@...capital.net>,
        Fengguang Wu <fengguang.wu@...el.com>,
        Richard Purdie <rpurdie@...ys.net>,
        Jacek Anaszewski <j.anaszewski@...sung.com>,
        Abhay Salunke <Abhay_Salunke@...l.com>,
        Julia Lawall <Julia.Lawall@...6.fr>,
        Gilles Muller <Gilles.Muller@...6.fr>,
        Nicolas Palix <nicolas.palix@...g.fr>,
        David Howells <dhowells@...hat.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Arend Van Spriel <arend.vanspriel@...adcom.com>,
        Kalle Valo <kvalo@...eaurora.org>, linux-leds@...r.kernel.org
Subject: Re: [PATCH 5/5] firmware: add DECLARE_FW_CUSTOM_FALLBACK() annotation

On Fri, Dec 16, 2016 at 5:27 AM, Pavel Machek <pavel@....cz> wrote:
> On Fri 2016-12-16 11:56:48, Luis R. Rodriguez wrote:
>> On Fri, Dec 16, 2016 at 11:14:05AM +0100, Pavel Machek wrote:
>> >
>> > Well, I was asking if the above snipped looks like valid use. Because
>> > AFAICT, the "custom fallback" is just dev_err(), see above. Coccinelle
>> > rules don't help me...
>>
>> Its not. Its when you ask for no uevent. Only 2 drivers do this.
>
> That was one of two you listed. If that is not valid use, perhaps it
> should be removed, not annotated?

Pavel, the annotation was added on top of:

static int lp55xx_request_firmware(struct lp55xx_chip *chip)
{
        const char *name = chip->cl->name;
        struct device *dev = &chip->cl->dev;

        return request_firmware_nowait(THIS_MODULE, false, name, dev,
                                GFP_KERNEL, chip, lp55xx_firmware_loaded);
}

Note the second argument is false. This matches the grammar and the
definition for a custom fallback mechanism since uevents are not used.
What am I missing?

 Luis