Messages in this thread Patch in this message | | | From | Wang Lu <> | Subject | [PATCH] PCI/P2PDMA: fix the wrong dma address calculation when map sg | Date | Thu, 9 Sep 2021 11:25:28 +0800 |
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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.
Signed-off-by: Wang Lu <wanglu@dapustor.com> --- drivers/pci/p2pdma.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c index 50cdde3e9a8b..327882638b30 100644 --- a/drivers/pci/p2pdma.c +++ b/drivers/pci/p2pdma.c @@ -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; } -- 2.17.1
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