netdev - Re: wl1251: NVS firmware data

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Message-Id: <201412081622.25541@pali>
Date:	Mon, 8 Dec 2014 16:22:25 +0100
From:	Pali Rohár <pali.rohar@...il.com>
To:	Ming Lei <ming.lei@...onical.com>
Cc:	Pavel Machek <pavel@....cz>,
	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
	"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 16:18:18 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.
> 
> Thanks,
> Ming Lei

Ming, for wl1251 NVS data we need to load use usermode helper and 
fallback to direct load. So I think it is better to handle this 
request in firmware code and not in driver.

-- 
Pali Rohár
pali.rohar@...il.com

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