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dma-direct: don't truncate dma_required_mask to bus addressing capabilities 

The dma required_mask needs to reflect the actual addressing capabilities
needed to handle the whole system RAM. When truncated down to the bus
addressing capabilities dma_addressing_limited() will incorrectly signal
no limitations for devices which are restricted by the bus_dma_mask.

Fixes: b4ebe60632 (dma-direct: implement complete bus_dma_mask handling)
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Tested-by: Atish Patra <atish.patra@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Lucas Stach 2019-08-05 17:51:53 +02:00 committed by Christoph Hellwig
parent cf14be0b41
commit d8ad55538a
1 changed files with 0 additions and 3 deletions
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3
kernel/dma/direct.c
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@ -47,9 +47,6 @@ u64 dma_direct_get_required_mask(struct device *dev)
{ {
u64 max_dma = phys_to_dma_direct(dev, (max_pfn - 1) << PAGE_SHIFT); u64 max_dma = phys_to_dma_direct(dev, (max_pfn - 1) << PAGE_SHIFT);
if (dev->bus_dma_mask && dev->bus_dma_mask < max_dma)
max_dma = dev->bus_dma_mask;
return (1ULL << (fls64(max_dma) - 1)) * 2 - 1; return (1ULL << (fls64(max_dma) - 1)) * 2 - 1;
} }