linux-kernel - Re: wl1251: NVS firmware data

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Message-Id: <201412081747.30965@pali>
Date:	Mon, 8 Dec 2014 17:47:30 +0100
From:	Pali Rohár <pali.rohar@...il.com>
To:	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>
Cc:	Ming Lei <ming.lei@...onical.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 Monday 08 December 2014 17:37:14 Greg Kroah-Hartman wrote:
> 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.
> 

Do not remove it! Without userspace firmware loader it is 
impossible to load dynamic firmware files.

> So no, I don't want to see this, and I don't want drivers to
> worry about this either.
> 
> greg k-h

-- 
Pali Rohár
pali.rohar@...il.com

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