On Sat, 24 Jan 2015, Alexey Khoroshilov wrote:
> oxu_qh_alloc() acquires oxu->mem_lock spinlock, finds free qh slot
> and calls ehci_qtd_alloc() to initialize qh->dummy, but
> ehci_qtd_alloc() acquires oxu->mem_lock as well.
> That means an unavoidable deadlock in oxu_qh_alloc().
>
> The patch fi
oxu_qh_alloc() acquires oxu->mem_lock spinlock, finds free qh slot
and calls ehci_qtd_alloc() to initialize qh->dummy, but
ehci_qtd_alloc() acquires oxu->mem_lock as well.
That means an unavoidable deadlock in oxu_qh_alloc().
The patch fixes the issue by introduction of unlocked version
of ehci_qt
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