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| author | Christoph Hellwig <hch@lst.de> | 2019-07-16 22:00:54 +0200 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2019-07-17 08:25:45 +0200 |
| commit | a5008b59cd9d8de12ab623cb5052bb4735330e5c (patch) | |
| tree | 50f36841635531cb81255bc1ffad56b3e229512e /kernel | |
| parent | b866455423e040813f113d8b87e8297778ee2014 (diff) | |
| download | linux-0-day-a5008b59cd9d8de12ab623cb5052bb4735330e5c.tar.gz linux-0-day-a5008b59cd9d8de12ab623cb5052bb4735330e5c.tar.xz | |
dma-direct: only limit the mapping size if swiotlb could be used
Don't just check for a swiotlb buffer, but also if buffering might
be required for this particular device.
Fixes: 133d624b1cee ("dma: Introduce dma_max_mapping_size()")
Reported-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/dma/direct.c | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c index d7cec866d16b5..e269b6f9b4441 100644 --- a/kernel/dma/direct.c +++ b/kernel/dma/direct.c @@ -399,11 +399,9 @@ int dma_direct_supported(struct device *dev, u64 mask) size_t dma_direct_max_mapping_size(struct device *dev) { - size_t size = SIZE_MAX; - /* If SWIOTLB is active, use its maximum mapping size */ - if (is_swiotlb_active()) - size = swiotlb_max_mapping_size(dev); - - return size; + if (is_swiotlb_active() && + (dma_addressing_limited(dev) || swiotlb_force == SWIOTLB_FORCE)) + return swiotlb_max_mapping_size(dev); + return SIZE_MAX; } |