linux-kernel - Re: patch "firmware loader: allow disabling of udev as firmware loader" added to driver-core tree

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Date:	Tue, 05 Aug 2014 18:01:18 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Jean-Michel Hautbois <jhautbois@...il.com>
Cc:	B_B_Singh@...l.com, Greg KH <gregkh@...uxfoundation.org>,
	Abhay_Salunke@...l.com, Arnd Bergmann <arnd@...db.de>,
	kay@...y.org, ming.lei@...onical.com, Stefan Roese <sr@...x.de>,
	teg@...m.no, Stuart_Hayes@...l.com, Srinivas_G_Gowda@...l.com,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: patch "firmware loader: allow disabling of udev as firmware loader" added to driver-core tree

At Tue, 5 Aug 2014 17:55:40 +0200,
Jean-Michel Hautbois wrote:
> 
> 2014-08-05 17:53 GMT+02:00 Takashi Iwai <tiwai@...e.de>:
> > At Tue, 5 Aug 2014 17:43:17 +0200,
> > Jean-Michel Hautbois wrote:
> >>
> >> 2014-08-01 22:01 GMT+02:00  <B_B_Singh@...l.com>:
> >> > Hi Takashi,
> >> >
> >> > Sorry for the late response,  I tried with latest stable kernel 3.15.8.  surprisingly the BIOS update works even without applying the patch in both the cases.
> >>
> >> Hi,I'm sorry for my late answer too, but I didn't try this patch recently...
> >>
> >> I have a Lattice FPGA on my board, and it seems that your patch breaks
> >> the firmware loading.
> >> I have the following config :
> >> CONFIG_FW_LOADER=y
> >> CONFIG_FW_LOADER_USER_HELPER=n
> >> FW_LOADER_USER_HELPER_FALLBACK=n
> >> LATTICE_ECP3_CONFIG=y
> >
> > It worked before applying my patch properly...?
> >
> > The kernel Oops itself is a bug in lattice-ecp3-config driver.
> > It blindly assumes that the returned firmware is non-NULL.
> > firmware_load() must have a NULL check of fw at the beginning.
> >
> >
> > thanks,
> >
> > Takashi
> 
> Yes, it worked, if the firmware was in the /lib/firmware directory.

Then double-check whether it's really my patch who broke.
In your kernel log:

[    1.188285] lattice-ecp3 spi2.3: Direct firmware load for lattice-ecp3.bit failed with error -2

which indicates that the direct f/w loading from /lib/firmware failed.
Since this code path is called no matter which kernel option is set,
the failure is very unlikely by my patch.


Takashi

> You are right, it lacks a NULL check, I will fix that.
> 
> Thanks,
> JM
> 
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