Re: btusb "firmware request while host is not available" at resume

[Gabriel C <nix.or.die@gmail.com>]

On 11.09.2017 03:25, Greg Kroah-Hartman wrote:
> On Sun, Sep 10, 2017 at 12:26:02PM -0700, Linus Torvalds wrote:
>> This seems to be a new problem at resume for the Intel btusb driver,
>> but I'm not seeing anything in that driver itself that looks like a
>> likely trigger, so I wonder if it's some driver core change, a generic
>> resume path issue, or a workqueue change that has made it trigger for
>> me.
>>
>> It might also just be a timing difference, maybe it's always been there?
>>
>> Does anybody have any ideas? It does't happen on every resume, and the
>> machine works despite this (but no bluetooth - the *next* resume might
>> bring it back, though).
> 
> Ah, it's not just me having this problem.  I don't see it happening in
> 4.12, and haven't had the time to bisect it.  I seem to be able to
> trigger it every suspend/resume cycle, so I don't know if it's a timing
> issue.


I see the same problem with QCA hardware.. but a bit different.

On first resume cycle the firmware call is fine but the adapter dies a bit later with :


  'Bluetooth: hci0: Failed to send body at 4 of 1857 (-110)'

On second resume cycle I hit the trace too.


> 
>>
>>                   Linus
>>
>> --
>>
>>    ACPI: Low-level resume complete
>>    ACPI: EC: EC started
>>    PM: Restoring platform NVS memory
>>    Enabling non-boot CPUs ...
>>    x86: Booting SMP configuration:
>>    smpboot: Booting Node 0 Processor 1 APIC 0x2
>>     cache: parent cpu1 should not be sleeping
>>    CPU1 is up
>>    smpboot: Booting Node 0 Processor 2 APIC 0x1
>>     cache: parent cpu2 should not be sleeping
>>    CPU2 is up
>>    smpboot: Booting Node 0 Processor 3 APIC 0x3
>>     cache: parent cpu3 should not be sleeping
>>    CPU3 is up
>>    ACPI: Waking up from system sleep state S3
>>    ACPI: EC: event unblocked
>>    usb 1-3: reset full-speed USB device number 2 using xhci_hcd
>>    usb 1-4: reset full-speed USB device number 3 using xhci_hcd
>>    usb 1-5: reset high-speed USB device number 4 using xhci_hcd
>>    usb 1-3:1.0: rebind failed: -517
>>    usb 1-3:1.1: rebind failed: -517
>>    Bluetooth: hci0: Bootloader revision 0.0 build 2 week 52 2014
>>    OOM killer enabled.
>>    Restarting tasks ...
>>    Bluetooth: hci0: Device revision is 5
>>    Bluetooth: hci0: Secure boot is enabled
>>    Bluetooth: hci0: OTP lock is enabled
>>    Bluetooth: hci0: API lock is enabled
>>    Bluetooth: hci0: Debug lock is disabled
>>    Bluetooth: hci0: Minimum firmware build 1 week 10 2014
>>    firmware request while host is not available
>>    ------------[ cut here ]------------
>>    WARNING: CPU: 2 PID: 621 at drivers/base/firmware_class.c:1250
>> _request_firmware+0x460/0x790
>>    CPU: 2 PID: 621 Comm: kworker/u9:2 Not tainted 4.13.0-10313-ge860d2c904d1 #11
>>    Hardware name: Dell Inc. XPS 13 9350/09JHRY, BIOS 1.4.17 05/10/2017
>>    Workqueue: hci0 hci_power_on [bluetooth]
>>    task: ffff8d3767895ac0 task.stack: ffff9d3481efc000
>>    RIP: 0010:_request_firmware+0x460/0x790
>>    Call Trace:
>>     request_firmware+0x37/0x50
>>     btusb_setup_intel_new+0x227/0x7e0 [btusb]
>>     hci_dev_do_open+0x3da/0x570 [bluetooth]
>>     hci_power_on+0x52/0x1f0 [bluetooth]
>>     process_one_work+0x1db/0x3d0
>>     worker_thread+0x47/0x3e0
>>     kthread+0x125/0x140
>>     ret_from_fork+0x22/0x30
>>    ---[ end trace 007b222491432927 ]---
>>    Bluetooth: hci0: Failed to load Intel firmware file (-112)
>>    [drm] RC6 on
>>    done.
>>    thermal thermal_zone11: failed to read out thermal zone (-5)
>>    PM: suspend exit
> 
> Ah, I'll blame Luis for this, I think it might be due to 81f95076281f
> ("firmware: add sanity check on shutdown/suspend")
>
> Luis, any ideas?  I'll try to revert this and try it out tomorrow when
> I get a chance.
>

I can revert it an fire up some testing..

This time with 4.13.x I hit all kind bugs on this box anyway :)