Subject: Re: bus_dmamap_sync not enough ?
To: Izumi Tsutsui <>
From: Jason R Thorpe <>
List: tech-kern
Date: 02/11/2003 17:58:11
On Tue, Feb 11, 2003 at 05:35:28PM -0800, Jason R Thorpe wrote:

 > I think it's fair to classify the drivers which do not issue another
 > dmamap_sync to be buggy ... I think it boils down to "someone noticed
 > the bug on an ARM platform, and the fxp driver got fixed".  The reason
 > it's fair to classify the others as buggy is that the bus_dma(9) manual
 > page states that a driver should not rely on BUS_DMA_COHERENT for correct
 > operation, that is is merely a hint to the back-end. further clarify, I think it would also be fair to say that all the
bugs of this nature are my fault :-)

        -- Jason R. Thorpe <>