Your argument is weak. There's no law saying an HC driver has to be in an IRQ handler when it calls giveback_urb. The only requirement is that the
from usb_hcd_giveback_urb() * @urb: urb being returned to the USB device driver. * @regs: pt_regs, passed down to the URB completion handler * Context: in_interrupt()
If you wish to drop that requirement you'll have to audit all drivers with respect to spinlocks.
Notice that in_interrupt() != in_irq(), though both imply "can't sleep".
The requirement is actually more like "irqs blocked", and I forget whether that implies "in_interrupt()".
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