i think in xhci_urb_enqueue
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int lock_acquired = spin_trylock_irqsave(&xhci_lock, flags);
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if (lock_aquired)
spin_unlock_irqrestore(&xhci_lock, flags);
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int lock_acquired = spin_trylock_irqsave(&xhci_lock, flags);
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if (lock_aquired)
spin_unlock_irqrestore(&xhci_lock, flags);