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

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Message-ID: <CAL8zT=j6DJ_JX7OT7csmuQPQj2AnwDxDvtBtui-i4PTbeGwmWw@mail.gmail.com>
Date:	Wed, 6 Aug 2014 12:50:28 +0200
From:	Jean-Michel Hautbois <jhautbois@...il.com>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	Shuah Khan <shuahkhan@...il.com>, B_B_Singh@...l.com,
	Greg KH <gregkh@...uxfoundation.org>,
	Arnd Bergmann <arnd@...db.de>, Kay Sievers <kay@...y.org>,
	Ming Lei <ming.lei@...onical.com>, Stefan Roese <sr@...x.de>,
	Tom Gundersen <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

2014-08-06 12:21 GMT+02:00 Takashi Iwai <tiwai@...e.de>:
> At Wed, 6 Aug 2014 11:44:14 +0200,
> Jean-Michel Hautbois wrote:
>>
>> 2014-08-06 11:24 GMT+02:00 Takashi Iwai <tiwai@...e.de>:
>> > At Wed, 6 Aug 2014 11:10:27 +0200,
>> > Jean-Michel Hautbois wrote:
>> >>
>> >> 2014-08-05 21:22 GMT+02:00 Shuah Khan <shuahkhan@...il.com>:
>> >> > On Tue, Aug 5, 2014 at 10:01 AM, Takashi Iwai <tiwai@...e.de> wrote:
>> >> >>> Yes, it worked, if the firmware was in the /lib/firmware directory.
>> >> >>
>> >> >
>> >> > ok it works when the firmware is in /lib/firmware. It sounds to me the
>> >> > reason load fails when the firmware is under /sys/class/firmware is
>> >> > fw_load_from_user_helper() returns -ENOENT when
>> >> > CONFIG_FW_LOADER_USER_HELPER is disabled.
>> >> >
>> >> > It would be nice to see the entire dmesg with debug enabled though.
>> >> >
>> >> > -- Shuah
>> >>
>> >> It does not work with the 3.16 kernel even when firmware is in
>> >> /lib/firmware, it worked before this patch is applied.
>> >
>> > Hm?  3.16 doesn't contain my patch yet.  It's merged for 3.17-rc1.
>>
>> Oh, you are right of course, I am on upstream kernel and I have your
>> patch. I don't mean your match is causing the issue though ;-).
>
> I see.
>
>> >> Here is what I got in my dmesg :
>> >> [    0.307856] __allocate_fw_buf: fw-lattice-ecp3.bit buf=bd81a480
>> >> [    0.308029] lattice-ecp3 spi2.3: Direct firmware load for
>> >> lattice-ecp3.bit failed with error -2
>> >
>> > It's -ENOENT.  Are you sure that you really have
>> >  /lib/firmware/lattice-ecp3.bit file?
>>
>> Yes :
>> ls -al /lib/firmware/lattice-ecp3.bit
>> -rwxr-xr-x 1 root root 897753 Aug  5 15:04 /lib/firmware/lattice-ecp3.bit
>
> Then you'd better bisect...
> Or, at least, put a debug code to see which file is opened in the loop
> in fw_get_filesystem_firmware().

Well, when this function is called, my rootfs is not yet mounted (I
have a dedicated partition on a SDCard)...
So I probably missed a step in order to get /lib/firmware before / is
mounted... ?

JM
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