diff options
| author | Wang Lu <[email protected]> | 2021-09-09 11:25:28 +0800 |
|---|---|---|
| committer | Bjorn Helgaas <[email protected]> | 2021-09-20 14:46:02 -0500 |
| commit | 3a19407913e8e43d6b799a59bc0f6cae889b5446 (patch) | |
| tree | 8e5776fb87a881e1671a396b4d102f566089e127 | |
| parent | e4e737bb5c170df6135a127739a9e6148ee3da82 (diff) | |
PCI/P2PDMA: Apply bus offset correctly in DMA address calculation
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/[email protected]
Signed-off-by: Wang Lu <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Reviewed-by: Logan Gunthorpe <[email protected]>
| -rw-r--r-- | drivers/pci/p2pdma.c | 2 |
1 files changed, 1 insertions, 1 deletions
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; } |