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

Linus Torvalds writes: (Summary) It does't happen on every resume, and the machine works despite this (but no bluetooth - the *next* resume might bring it back, though).
bring it back, though).
Linus
Linus
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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 US