Re: DMA debug trace pointing to rtl8187

Greg KH
2009-05-09T19:34:01Z

On Sat, May 09, 2009 at 12:29:27PM -0500, Larry Finger wrote:
> I think there is a second problem that John's fix does not treat. Although the
> buffer is removed from the stack, there is no assurance that the buffer obtained
> with kmalloc() is reachable by DMA. This case will be triggered if the USB
> adapter does 32-bit DMA and the system has more than 4 GB RAM.

Memory returned by kmalloc will always be able to be DMAable. If not,
we have lots of problems :)

thanks,

greg k-h