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| author | Christoph Hellwig <hch@lst.de> | 2018-09-20 14:04:08 +0200 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2018-10-01 07:28:03 -0700 |
| commit | b4ebe6063204da58e48600b810a97c29ae9e5d12 (patch) | |
| tree | 5bf1cf53eeaa87f1bf0d89e8f55cf27d720599b9 /include/linux/dma-direct.h | |
| parent | 7d21ee4c719f00896767ce19c4c01a56374c2ced (diff) | |
| download | lwn-b4ebe6063204da58e48600b810a97c29ae9e5d12.tar.gz lwn-b4ebe6063204da58e48600b810a97c29ae9e5d12.zip | |
dma-direct: implement complete bus_dma_mask handling
Instead of rejecting devices with a too small bus_dma_mask we can handle
by taking the bus dma_mask into account for allocations and bounce
buffering decisions.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'include/linux/dma-direct.h')
| -rw-r--r-- | include/linux/dma-direct.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/dma-direct.h b/include/linux/dma-direct.h index b79496d8c75b..fbca184ff5a0 100644 --- a/include/linux/dma-direct.h +++ b/include/linux/dma-direct.h @@ -27,7 +27,8 @@ static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size) if (!dev->dma_mask) return false; - return addr + size - 1 <= *dev->dma_mask; + return addr + size - 1 <= + min_not_zero(*dev->dma_mask, dev->bus_dma_mask); } #endif /* !CONFIG_ARCH_HAS_PHYS_TO_DMA */ |