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| author | James Sewart <jamessewart@arista.com> | 2019-12-10 15:51:33 -0600 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2019-12-18 12:21:16 -0600 |
| commit | f8bf2aeb651b3460a4b36fd7ba1ba1d31777d35c (patch) | |
| tree | 202de2282e09e50ca722a0e65f336fee7c36a901 /drivers/pci/pci.h | |
| parent | 8c386cc817878588195dde38e919aa6ba9409d58 (diff) | |
| download | lwn-f8bf2aeb651b3460a4b36fd7ba1ba1d31777d35c.tar.gz lwn-f8bf2aeb651b3460a4b36fd7ba1ba1d31777d35c.zip | |
PCI: Fix pci_add_dma_alias() bitmask size
The number of possible devfns is 256, but pci_add_dma_alias() allocated a
bitmap of size 255. Fix this off-by-one error.
This fixes commits 338c3149a221 ("PCI: Add support for multiple DMA
aliases") and c6635792737b ("PCI: Allocate dma_alias_mask with
bitmap_zalloc()"), but I doubt it was possible to see a problem because
it takes 4 64-bit longs (or 8 32-bit longs) to hold 255 bits, and
bitmap_zalloc() doesn't save the 255-bit size anywhere.
[bhelgaas: commit log, move #define to drivers/pci/pci.h, include loop
limit fix from Qian Cai:
https://lore.kernel.org/r/20191218170004.5297-1-cai@lca.pw]
Signed-off-by: James Sewart <jamessewart@arista.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Diffstat (limited to 'drivers/pci/pci.h')
| -rw-r--r-- | drivers/pci/pci.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index a0a53bd05a0b..6394e7746fb5 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -4,6 +4,9 @@ #include <linux/pci.h> +/* Number of possible devfns: 0.0 to 1f.7 inclusive */ +#define MAX_NR_DEVFNS 256 + #define PCI_FIND_CAP_TTL 48 #define PCI_VSEC_ID_INTEL_TBT 0x1234 /* Thunderbolt */ |