Re: [PATCH v1] media: uvcvideo: handle urb completion in a work queue

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On Wed, 9 Sep 2015, Laurent Pinchart wrote:

> > > Instead of fixing the issue in the uvcvideo driver, would it then make
> > > more sense to fix it in the remaining hcd drivers ?
> > 
> > Unfortunately that's not so easy.  It involves some subtle changes
> > related to the way isochronous endpoints are handled.  I wouldn't know
> > what to change in any of the HCDs, except the ones that I maintain.
> 
> I'm not saying it would be easy, but I'm wondering whether it makes change to 
> move individual USB device drivers to work queues when the long term goal is 
> to use tasklets for URB completion anyway.

I'm not sure that this is a long-term goal for every HCD.  For
instance, there probably isn't much incentive to convert a driver if
its host controllers can only run at low speed or full speed.

Alan Stern

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