From: Lucas Stach l.stach@pengutronix.de
[ Upstream commit d8ad55538abe443919e20e0bb996561bca9cad84 ]
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: b4ebe6063204 (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 Signed-off-by: Sasha Levin sashal@kernel.org --- kernel/dma/direct.c | 3 --- 1 file changed, 3 deletions(-)
diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c index 2c2772e9702ab..9912be7a970de 100644 --- a/kernel/dma/direct.c +++ b/kernel/dma/direct.c @@ -55,9 +55,6 @@ u64 dma_direct_get_required_mask(struct device *dev) { 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; }