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@lst.de
drivers/scsi/53c700.c | 113 +++++++++++++++++++++++------------------- drivers/scsi/53c700.h | 17 ++++--- 2 files changed, 72 insertions(+), 58 deletions(-)
Tested-by: Thomas Bogendoerfer tsbogend@alpha.franken.de