dma-mapping: truncate dma masks to what dma_addr_t can hold

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The dma masks in struct device are always 64-bits wide.  But for builds
using a 32-bit dma_addr_t we need to ensure we don't store an
unsupportable value.  Before Linux 5.0 this was handled at least by
the ARM dma mapping code by never allowing to set a larger dma_mask,
but these days we allow the driver to just set the largest supported
value and never fall back to a smaller one.  Ensure this always works
by truncating the value.

Fixes: 9eb9e96e97 ("Documentation/DMA-API-HOWTO: update dma_mask sections")
Signed-off-by: Christoph Hellwig <hch@lst.de>

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Christoph Hellwig 2019-04-29 09:16:42 -05:00

parent 591fcf3b30

commit 4a54d16f61

1 changed files with 12 additions and 0 deletions

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kernel/dma/mapping.c

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