linux-kernel - Re: [PATCH] firmware: add a function to load optional firmware v2

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Date:   Tue, 13 Mar 2018 18:46:58 +0200
From:   Kalle Valo <kvalo@...eaurora.org>
To:     "Luis R. Rodriguez" <mcgrof@...nel.org>
Cc:     Andres Rodriguez <andresx7@...il.com>,
        "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-wireless <linux-wireless@...r.kernel.org>,
        Arend Van Spriel <arend.vanspriel@...adcom.com>
Subject: Re: [PATCH] firmware: add a function to load optional firmware v2

"Luis R. Rodriguez" <mcgrof@...nel.org> writes:

> On Tue, Mar 13, 2018 at 03:16:34PM +0200, Kalle Valo wrote:
>> "Luis R. Rodriguez" <mcgrof@...nel.org> writes:
>> 
>> >> +/**
>> >> + * request_firmware_optional: - request for an optional fw module
>> >> + * @firmware_p: pointer to firmware image
>> >> + * @name: name of firmware file
>> >> + * @device: device for which firmware is being loaded
>> >> + *
>> >> + * This function is similar in behaviour to request_firmware(), except
>> >> + * it doesn't produce warning messages when the file is not found.
>> >> + **/
>> >> +int
>> >> +request_firmware_optional(const struct firmware **firmware_p, const char *name,
>> >> +                         struct device *device)
>> >> +{
>> >> +       int ret;
>> >> +
>> >> +       /* Need to pin this module until return */
>> >> +       __module_get(THIS_MODULE);
>> >> +               ret = _request_firmware(firmware_p, name, device, NULL, 0,
>> >> +                               FW_OPT_UEVENT | FW_OPT_NO_WARN );
>> >> +       module_put(THIS_MODULE);
>> >> +       return ret;
>> >> +}
>> >> +EXPORT_SYMBOL(request_firmware_optional);
>> >
>> > New exported symbols for the firmware API should be EXPORT_SYMBOL_GPL().
>> 
>> To me the word optional feels weird to me. For example, in ath10k I
>> suspect we would be only calling request_firmware_optional() with all
>> firmware and not request_firmware() at all.
>> 
>> How about request_firmware_nowarn()? That would even match the
>> documentation above.
>
> _nowarn() works with me. Do you at least want the return value to give
> an error value if no file was found? This way the driver can decide
> when to issue an error if it wants to.

Yes, it would be very good to return the error value to ath10k. That way
we can give a proper error message to the user if we can't find a
suitable firmware image.

-- 
Kalle Valo