Re: OHCI hangs after failing to free resources

David Brownell wrote: 
> So, trying for some (bad) ASCII art here
> 
>   TDs 1-4 submitted to ED,
>   HC completed a few (say, 1 & 2)
> 
>         ed.tail ---------------------------+
>         ed.head ----------+                I
>                           I                I
>                           v                v
>         td1 -->  td2 --> td3 --> td4 --> dummy
> 
> Where "td" is like td1, and clearly is not the first TD in
> the queue.
> 
> One problem being that by now td1 and td2 should have shown up in
> the donelist, through an IRQ.  That would explain the symprom of
> data transfers seeming to stop.
> 
> It'd be interesting to see whether there's anything in that donelist;
> if so, that might suggest that the driver somehow lost an IRQ.  Try
> printing its value in that "sanitize" path.

It looks like the donelist is empty.

user.warn kernel: ohci_hcd 0000:00:13.0: IRQ INTR_SF lossage
user.err kernel: ohci_hcd 0000:00:13.0: done_head:0
user.warn kernel: finish_unlinks
user.warn kernel: finish_unlinks: 0x2daa480 != 0x2daa440
user.warn kernel: finish_unlinks:skip ed
user.err kernel: ohci_hcd 0000:00:13.0: leak ed c2b8f140 (#82) state 0
(has tds)
user.err kernel: ohci_hcd 0000:00:13.0: free td c2daa440

Mike

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