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PCI/P2PDMA: Apply bus offset correctly in DMA address calculation

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The bus offset is bus address - physical address, so the calculation in
__pci_p2pdma_map_sg should be: bus address = physical address + bus offset.

Correct the dma_address computation in __pci_p2pdma_map_sg().

Link: https://lore.kernel.org/r/20210909032528.24517-1-wanglu@dapustor.com
Signed-off-by: Wang Lu <wanglu@dapustor.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
This commit is contained in:
Wang Lu 2021-09-09 11:25:28 +08:00 committed by Bjorn Helgaas
parent e4e737bb5c
commit 3a19407913
1 changed files with 1 additions and 1 deletions
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2
drivers/pci/p2pdma.c
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@ -874,7 +874,7 @@ static int __pci_p2pdma_map_sg(struct pci_p2pdma_pagemap *p2p_pgmap,
int i;
for_each_sg(sg, s, nents, i) {
s->dma_address = sg_phys(s) - p2p_pgmap->bus_offset;
s->dma_address = sg_phys(s) + p2p_pgmap->bus_offset;
sg_dma_len(s) = s->length;
}