On Tue, Sep 15, 2020 at 05:51:11PM +0200, Christoph Hellwig wrote: > Switch the 53c700 driver to only use non-coherent descriptor memory if it > really has to because dma_alloc_coherent fails. This doesn't matter for > any of the platforms it runs on currently, but that will change soon. > > To help with this two new helpers to transfer ownership to and from the > device are added that abstract the syncing of the non-coherent memory. > The two current bidirectional cases are mapped to transfers to the > device, as that appears to what they are used for. Note that for parisc, > which is the only architecture this driver needs to use non-coherent > memory on, the direction argument of dma_cache_sync is ignored, so this > will not change behavior in any way. > > Signed-off-by: Christoph Hellwig <hch@xxxxxx> > --- > drivers/scsi/53c700.c | 113 +++++++++++++++++++++++------------------- > drivers/scsi/53c700.h | 17 ++++--- > 2 files changed, 72 insertions(+), 58 deletions(-) Tested-by: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx> -- Crap can work. Given enough thrust pigs will fly, but it's not necessarily a good idea. [ RFC1925, 2.3 ]
