diff options
Diffstat (limited to 'drivers/pci/vpd.c')
| -rw-r--r-- | drivers/pci/vpd.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/drivers/pci/vpd.c b/drivers/pci/vpd.c index 7c3a097379bb..b1d012900f1e 100644 --- a/drivers/pci/vpd.c +++ b/drivers/pci/vpd.c @@ -380,6 +380,39 @@ ssize_t pci_write_vpd(struct pci_dev *dev, loff_t pos, size_t count, const void } EXPORT_SYMBOL(pci_write_vpd); +int pci_vpd_find_ro_info_keyword(const void *buf, unsigned int len, + const char *kw, unsigned int *size) +{ + int ro_start, infokw_start; + unsigned int ro_len, infokw_size; + + ro_start = pci_vpd_find_tag(buf, len, PCI_VPD_LRDT_RO_DATA); + if (ro_start < 0) + return ro_start; + + ro_len = pci_vpd_lrdt_size(buf + ro_start); + ro_start += PCI_VPD_LRDT_TAG_SIZE; + + if (ro_start + ro_len > len) + ro_len = len - ro_start; + + infokw_start = pci_vpd_find_info_keyword(buf, ro_start, ro_len, kw); + if (infokw_start < 0) + return infokw_start; + + infokw_size = pci_vpd_info_field_size(buf + infokw_start); + infokw_start += PCI_VPD_INFO_FLD_HDR_SIZE; + + if (infokw_start + infokw_size > len) + return -EINVAL; + + if (size) + *size = infokw_size; + + return infokw_start; +} +EXPORT_SYMBOL_GPL(pci_vpd_find_ro_info_keyword); + #ifdef CONFIG_PCI_QUIRKS /* * Quirk non-zero PCI functions to route VPD access through function 0 for |