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wa_urb_dequeue() locks multiple spinlocks while disabling interrupts: spin_lock_irqsave(&lock1, flags); spin_lock_irqsave(&lock2, flags2); Obviously there is no need for the second irqsave and "flags2" variable since interrupts are disabled at that point. Remove the second irqsave: spin_lock_irqsave(&lock1, flags); spin_lock(&lock2); and eliminate the flags2 variable. Signed-off-by: John Ogness <john.ogness@linutronix.de> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>