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

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Date:	Tue, 5 Aug 2014 17:55:40 +0200
From:	Jean-Michel Hautbois <jhautbois@...il.com>
To:	Takashi Iwai <tiwai@...e.de>
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

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

Thanks,
JM
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