linux-kernel - Re: wl1251: NVS firmware data

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Message-ID: <20141208163714.GA31169@kroah.com>
Date:	Mon, 8 Dec 2014 11:37:14 -0500
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Ming Lei <ming.lei@...onical.com>
Cc:	Pali Rohár <pali.rohar@...il.com>,
	Pavel Machek <pavel@....cz>,
	"John W. Linville" <linville@...driver.com>,
	Grazvydas Ignotas <notasas@...il.com>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	Network Development <netdev@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
	Aaro Koskinen <aaro.koskinen@....fi>,
	Kalle Valo <kvalo@...rom.com>,
	Sebastian Reichel <sre@...g0.de>,
	David Gnedt <david.gnedt@...izone.at>
Subject: Re: wl1251: NVS firmware data

On Mon, Dec 08, 2014 at 11:18:18PM +0800, Ming Lei wrote:
> On Sat, Dec 6, 2014 at 9:02 PM, Pali Rohár <pali.rohar@...il.com> wrote:
> > On Saturday 06 December 2014 13:49:54 Pavel Machek wrote:
> 
> >
> >  /**
> > + * request_firmware_prefer_user: - prefer usermode helper for loading firmware
> > + * @firmware_p: pointer to firmware image
> > + * @name: name of firmware file
> > + * @device: device for which firmware is being loaded
> > + *
> > + * This function works pretty much like request_firmware(), but it prefer
> > + * usermode helper. If usermode helper fails then it fallback to direct access.
> > + * Usefull for dynamic or model specific firmware data.
> > + **/
> > +int request_firmware_prefer_user(const struct firmware **firmware_p,
> > +                           const char *name, struct device *device)
> > +{
> > +       int ret;
> > +       __module_get(THIS_MODULE);
> > +       ret = _request_firmware(firmware_p, name, device,
> > +                               FW_OPT_UEVENT | FW_OPT_PREFER_USER);
> > +       module_put(THIS_MODULE);
> > +       return ret;
> > +}
> > +EXPORT_SYMBOL_GPL(request_firmware_prefer_user);
> 
> I'd like to introduce request_firmware_user() which only requests
> firmware from user space, and this way is simpler and more flexible
> since we have request_firmware_direct() already.

Why would a driver care about what program provides the firmware?  It
shouldn't at all, and we want to get rid of the userspace firmware
loader, not encourage drivers to use it "exclusively" at all.

So no, I don't want to see this, and I don't want drivers to worry about
this either.

greg k-h
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