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| author | Xiongfeng Wang <wangxiongfeng2@huawei.com> | 2023-08-04 15:56:30 +0800 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2023-08-16 23:54:48 +1000 |
| commit | 0e1cd3d9f82eb5440d32d4c0f12c65403b956cb5 (patch) | |
| tree | 53d4df86c95f8537345a005ee8d042ecec5231ef /drivers/misc/cxl | |
| parent | 6039fcd3fba99451ea9d013c4d3a65a40b2feff0 (diff) | |
| download | linux-0e1cd3d9f82eb5440d32d4c0f12c65403b956cb5.tar.gz | |
cxl: Use pci_find_vsec_capability() to simplify the code
PCI core add pci_find_vsec_capability() to query VSEC. We can use that
core API to simplify the code.
The only logical change is that pci_find_vsec_capability check the
Vendor ID before finding the VSEC.
PCI spec rev 5.0 says in 7.9.5.2 Vendor-Specific Header:
VSEC ID - This field is a vendor-defined ID number that indicates the
nature and format of the VSEC structure
Software must qualify the Vendor ID before interpreting this field.
Signed-off-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Reviewed-by: Andrew Donnellan <ajd@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230804075630.186054-1-wangxiongfeng2@huawei.com
Diffstat (limited to 'drivers/misc/cxl')
| -rw-r--r-- | drivers/misc/cxl/pci.c | 11 |
1 files changed, 1 insertions, 10 deletions
diff --git a/drivers/misc/cxl/pci.c b/drivers/misc/cxl/pci.c index 0ff944860dda98..4cf9e7c42a244e 100644 --- a/drivers/misc/cxl/pci.c +++ b/drivers/misc/cxl/pci.c @@ -150,16 +150,7 @@ static inline resource_size_t p2_size(struct pci_dev *dev) static int find_cxl_vsec(struct pci_dev *dev) { - int vsec = 0; - u16 val; - - while ((vsec = pci_find_next_ext_capability(dev, vsec, PCI_EXT_CAP_ID_VNDR))) { - pci_read_config_word(dev, vsec + 0x4, &val); - if (val == CXL_PCI_VSEC_ID) - return vsec; - } - return 0; - + return pci_find_vsec_capability(dev, PCI_VENDOR_ID_IBM, CXL_PCI_VSEC_ID); } static void dump_cxl_config_space(struct pci_dev *dev) |