Re: bluetooth related firmware loader spew on resume.

[Takashi Iwai]

At Thu, 27 Nov 2014 09:59:12 +0100,
Arend van Spriel wrote:
> 
> On 11/26/14 19:13, Takashi Iwai wrote:
> > At Wed, 26 Nov 2014 18:42:46 +0100,
> > Arend van Spriel wrote:
> >>
> >> On 11/26/14 16:27, Takashi Iwai wrote:
> >>> At Wed, 26 Nov 2014 17:26:15 +0200,
> >>> Mihai DonÈu wrote:
> >>>>
> >>>> On Wed, 26 Nov 2014 16:19:49 +0100
> >>>> Takashi Iwai<tiwai@xxxxxxx>   wrote:
> >>>>
> >>>>> At Wed, 26 Nov 2014 16:56:09 +0200,
> >>>>> Mihai DonÈu wrote:
> >>>>>>
> >>>>>> On Tue, 11 Nov 2014 13:12:28 -0500 Dave Jones wrote:
> >>>>>>> Since the addition of 10d4c6736ea "Bluetooth: btusb: Add Broadcom patch
> >>>>>>> RAM support", I (and a number of other people[*]) have been seeing
> >>>>>>> this trace on resume from suspend.
> >>>>>>>
> >>>>>>> WARNING: CPU: 1 PID: 8565 at drivers/base/firmware_class.c:1127 _request_firmware+0x4c1/0x7c0()
> >>>>>>> CPU: 1 PID: 8565 Comm: kworker/u17:0 Not tainted 3.17.2-200.fc20.x86_64 #1
> >>>>>>> Hardware name: LENOVO 2356JK8/2356JK8, BIOS G7ET94WW (2.54 ) 04/30/2013
> >>>>>>> Workqueue: hci0 hci_power_on [bluetooth]
> >>>>>>> 0000000000000000 00000000f52a564b ffff8800a8c63be8 ffffffff817271cc
> >>>>>>> 0000000000000000 ffff8800a8c63c20 ffffffff81094ced ffff8800a8c63d10
> >>>>>>> ffff8801365ddf00 ffff8801387b4b00 ffff8800a8c63d08 00000000fffffff5
> >>>>>>> Call Trace:
> >>>>>>> [<ffffffff817271cc>] dump_stack+0x45/0x56
> >>>>>>> [<ffffffff81094ced>] warn_slowpath_common+0x7d/0xa0
> >>>>>>> [<ffffffff81094e1a>] warn_slowpath_null+0x1a/0x20
> >>>>>>> [<ffffffff814965c1>] _request_firmware+0x4c1/0x7c0
> >>>>>>> [<ffffffff8137b9b9>] ? snprintf+0x49/0x70
> >>>>>>> [<ffffffff814968f1>] request_firmware+0x31/0x50
> >>>>>>> [<ffffffffa0943bf3>] btusb_setup_bcm_patchram+0x83/0x550 [btusb]
> >>>>>>> [<ffffffff8148ecf6>] ? rpm_idle+0xd6/0x2b0
> >>>>>>> [<ffffffffa0649051>] hci_dev_do_open+0xe1/0xa60 [bluetooth]
> >>>>>>> ACPI: \_SB_.PCI0.LPC_.EC__.BAT1: docking
> >>>>>>> Restarting tasks ...
> >>>>>>> [<ffffffff810bcb3d>] ? ttwu_do_activate.constprop.90+0x5d/0x70
> >>>>>>> [<ffffffffa064a1c0>] hci_power_on+0x40/0x1e0 [bluetooth]
> >>>>>>> [<ffffffff810f53fb>] ? lock_timer_base.isra.34+0x2b/0x50
> >>>>>>> [<ffffffff810acc39>] process_one_work+0x149/0x3d0
> >>>>>>> [<ffffffff810ad2bb>] worker_thread+0x11b/0x490
> >>>>>>> [<ffffffff810ad1a0>] ? rescuer_thread+0x2e0/0x2e0
> >>>>>>> [<ffffffff810b2318>] kthread+0xd8/0xf0
> >>>>>>> [<ffffffff810b2240>] ? kthread_create_on_node+0x190/0x190
> >>>>>>> [<ffffffff8172e7bc>] ret_from_fork+0x7c/0xb0
> >>>>>>> [<ffffffff810b2240>] ? kthread_create_on_node+0x190/0x190
> >>>>>>> ---[ end trace 75a0e9c7f33ebb4c ]---
> >>>>>>> bluetooth hci0: firmware: brcm/BCM20702A0-0a5c-21e6.hcd will not be loaded
> >>>>>>> Bluetooth: hci0: BCM: patch brcm/BCM20702A0-0a5c-21e6.hcd not found
> >>>>>>>
> >>>>>>>
> >>>>>>> At first I thought it was just over-reaction to the file being missing, but
> >>>>>>> looking at the WARN_ON, it appears that we're trying to invoke the firmware
> >>>>>>> loader before userspace is back up ?
> >>>>>>>
> >>>>>>> In this (and probably other related) kernel, CONFIG_FW_LOADER_USER_HELPER is unset,
> >>>>>>> in case that matters at all.
> >>>>>>>
> >>>>>>> 	Dave
> >>>>>>>
> >>>>>>> [*] https://bugzilla.kernel.org/show_bug.cgi?id=81821
> >>>>>>>       https://bugzilla.redhat.com/show_bug.cgi?id=1133378
> >>>>>>
> >>>>>> I have the following during normal boot:
> >>>>>>
> >>>>>> [    5.620796] Bluetooth: hci0: read Intel version: 370710018002030d00
> >>>>>> [    5.620822] bluetooth hci0: Direct firmware load for intel/ibt-hw-37.7.10-fw-1.80.2.3.d.bseq failed with error -2
> >>>>>> [    5.620827] Bluetooth: hci0 failed to open Intel firmware file: intel/ibt-hw-37.7.10-fw-1.80.2.3.d.bseq(-2)
> >>>>>> [    5.620920] bluetooth hci0: Direct firmware load for intel/ibt-hw-37.7.bseq failed with error -2
> >>>>>> [    5.620922] Bluetooth: hci0 failed to open default Intel fw file: intel/ibt-hw-37.7.bseq
> >>>>>> [    5.629910] EXT4-fs (sda2): mounted filesystem with ordered data mode. Opts: (null)
> >>>>>> [    5.629916] VFS: Mounted root (ext4 filesystem) readonly on device 8:2.
> >>>>>>
> >>>>>> The driver is trying to load the firmware before root is mounted. Do I
> >>>>>> really need an initramfs?
> >>>>>
> >>>>> If btusb driver is loaded in initrd, you'd need the corresponding
> >>>>> firmware in initrd, too.
> >>>>
> >>>> The driver is built into the kernel and I don't use an initrd. I could
> >>>> probably create one, but it's a bit tricky with UEFI and a tad harder
> >>>> to maintain.
> >>>
> >>> Then you can build the firmware file into kernel, too.
> >>
> >> huh? The whole idea of the firmware API was to keep (often proprietary)
> >> firmware out of the kernel. Has that strategy been abandoned recently?
> >
> > See CONFIG_EXTRA_FIRMARE.  It doesn't mean to include the binary blob
> > into the kernel source tree.  It just allows to *build* into your
> > kernel.
> 
> I see. Thanks for the info. I still do not understand the resume 
> scenario. I though firmware api did some sort of caching of the firmware 
> images.

My theory is that this is triggered when the firmware file doesn't
exist.  Then it's neither remembered nor cached, so it's retried in
the resume path.  But the information is missing, so I cannot say
surely about it.


Takashi
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