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Subjectbtusb "firmware request while host is not available" at resume
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

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).



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
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:
btusb_setup_intel_new+0x227/0x7e0 [btusb]
hci_dev_do_open+0x3da/0x570 [bluetooth]
hci_power_on+0x52/0x1f0 [bluetooth]
---[ end trace 007b222491432927 ]---
Bluetooth: hci0: Failed to load Intel firmware file (-112)
[drm] RC6 on
thermal thermal_zone11: failed to read out thermal zone (-5)
PM: suspend exit

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