> Apparently, there's a window when OHCI is shut down, when we shut the
> controller down and freed hcca, but did not release the IRQ. On a shared
> IRQ, some other device interrupts, and we oops referring to hcca.
>
> The attached patch looks like a ham-fisted way to fix this ...

Indeed.  Did you try just freeing the IRQ in ohci_stop(), and setting
hcd->irq = -1 to tell usbcore not do free it again?


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