[linux-usb-devel] [Patch] for UHCI driver (from kernel 2.6.6).

Oliver Neukum oliver at neukum.org
Sat Jun 19 16:53:26 EST 2004

Am Freitag, 18. Juni 2004 23:41 schrieb Alan Stern:
> > barriers. Actually, it's worse, you need a full mb() to order them,
> > which is why lately, we made ppc64 writeX() do full sync's ... that sucks
> > but it's near to impossible to get an abstract IO API that would cover
> > our needs here and still make other archs happy it seems...
> I recently changed a few mb() calls to wmb(), because they only protected
> data the CPU was writing to be read by the device.  Do you think changing
> all the wmb()'s back to mb()'s would make a difference?

Are these issues documented somewhere?


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