Re: [PATCH 4/4] USB: add urb->unlinked field

On Tuesday 21 August 2007, Alan Stern wrote:
> This patch (as970) adds a new urb->unlinked field, which is used to
> store the status of unlinked URBs since we can't use urb->status for
> that purpose any more.  To help simplify the HCDs, usbcore will check
> urb->unlinked before calling the completion handler; if the value is
> set it will automatically override the status reported by the HCD.

That changes behavior, right?  Previously, if e.g. an IO error
was reported in urb->status and the HCD was somewhere in the
process of cleaning up after that error before reporting that
completion, an unlink would fail but that status would be made
available as the urb's completion status.

Now, in that same scenario, the unlink would complete and that
hardware status would be discarded.  The documentation for the
unlink would seem to need to be changed too.

- Dave


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