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

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

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.



> 
>                  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.

thanks,

greg k-h