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| author | Guo Ren <ren_guo@c-sky.com> | 2019-07-30 14:43:22 +0800 |
|---|---|---|
| committer | Guo Ren <ren_guo@c-sky.com> | 2019-07-31 11:05:25 +0800 |
| commit | 7f80fe207de9602aaff028c79345caa68c90cd31 (patch) | |
| tree | 4052003f821439f67f8be27a26c016075cf48e7d /arch/csky/mm/dma-mapping.c | |
| parent | 81b23ba645e6b2b446093b2d927c261a17f7dee3 (diff) | |
| download | linux-7f80fe207de9602aaff028c79345caa68c90cd31.tar.bz2 | |
csky: Fixup dma_alloc_coherent with PAGE_SO attribute
This bug is from commit: 2b070ccdf8c0 (fixup abiv2 mmap(... O_SYNC)
failed). In that patch we remove the _PAGE_SO for memory noncache
mapping and this will cause problem when drivers use dma descriptors
to control the transcations without dma_w/rmb().
After referencing other archs' implementation, pgprot_writecombine is
introduced for mmap(... O_SYNC).
Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Diffstat (limited to 'arch/csky/mm/dma-mapping.c')
0 files changed, 0 insertions, 0 deletions