diff options
| -rw-r--r-- | drivers/iommu/dmar.c | 22 |
1 files changed, 19 insertions, 3 deletions
diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c index 68da1ab0f2c..b3774ef3f25 100644 --- a/drivers/iommu/dmar.c +++ b/drivers/iommu/dmar.c @@ -178,17 +178,33 @@ static bool dmar_match_pci_path(struct dmar_pci_notify_info *info, int bus, int i; if (info->bus != bus) - return false; + goto fallback; if (info->level != count) - return false; + goto fallback; for (i = 0; i < count; i++) { if (path[i].device != info->path[i].device || path[i].function != info->path[i].function) - return false; + goto fallback; } return true; + +fallback: + + if (count != 1) + return false; + + i = info->level - 1; + if (bus == info->path[i].bus && + path[0].device == info->path[i].device && + path[0].function == info->path[i].function) { + pr_info(FW_BUG "RMRR entry for device %02x:%02x.%x is broken - applying workaround\n", + bus, path[0].device, path[0].function); + return true; + } + + return false; } /* Return: > 0 if match found, 0 if no match found, < 0 if error happens */ |