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

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Message-ID: <s5h61i56gat.wl%tiwai@suse.de>
Date:	Wed, 06 Aug 2014 12:52:42 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Jean-Michel Hautbois <jhautbois@...il.com>
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

At Wed, 6 Aug 2014 12:50:28 +0200,
Jean-Michel Hautbois wrote:
> 
> 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... ?

Yeah, possibly :)  Maybe you did put /lib/firmware/* into initrd in
the earlier tests?


Takashi
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