On Mon, 2015-08-03 at 16:07 +0300, Mathias Nyman wrote:
> From: Gavin Shan <[email protected]>
>
> When xhci_mem_cleanup() is called, it's possible that the command
> timer isn't initialized and scheduled. For those cases, to delete
> the command timer causes soft-lockup as below stack dump shows.
>
> The patch avoids deleting the command timer if it's not scheduled
> with the help of timer_pending().
Are you sure this is safe? timer_pending() will not show you that
the timer function is running. It looks like you introduced a race
between timeout and cleanup.
Regards
Oliver
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