MIPS: make dma_sync_*_for_cpu a little less overzealous

Browse source

When transferring DMA ownership back to the CPU there should never
be any writeback from the cache, as the buffer was owned by the
device until now.  Instead it should just be invalidated for the
mapping directions where the device could have written data.
Note that the changes rely on the fact that kmap_atomic is stubbed
out for the !HIGHMEM case to simplify the code a bit.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

...

This commit is contained in:

Christoph Hellwig 2020-08-18 15:18:23 +02:00

parent ec91ccb274

commit cbf1449ba5

1 changed files with 28 additions and 16 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

44

arch/mips/mm/dma-noncoherent.c

View file