There used to be a bug in the uhci implementation which showed up
when using slab debugging: the memory for a transfer descriptor could
still be in use by the host controller after the uhci driver had freed it.  Slab
debugging meant that the memory was filled with some special rubbish
values when it was freed.  This would cause the host controller to barf.
The final result was a -EILSEQ.

Just an example,

Duncan.


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