diff options
| -rw-r--r-- | src/soc/intel/common/smihandler.c | 23 |
1 files changed, 16 insertions, 7 deletions
diff --git a/src/soc/intel/common/smihandler.c b/src/soc/intel/common/smihandler.c index 0b220e201c..5915587b50 100644 --- a/src/soc/intel/common/smihandler.c +++ b/src/soc/intel/common/smihandler.c @@ -104,15 +104,24 @@ static void busmaster_disable_on_bus(int bus) reg32 &= ~PCI_COMMAND_MASTER; pci_write_config32(dev, PCI_COMMAND, reg32); - /* If this is a bridge, then follow it. */ + /* If it's not a bridge, move on. */ hdr = pci_read_config8(dev, PCI_HEADER_TYPE); hdr &= 0x7f; - if (hdr == PCI_HEADER_TYPE_BRIDGE || - hdr == PCI_HEADER_TYPE_CARDBUS) { - unsigned int buses; - buses = pci_read_config32(dev, PCI_PRIMARY_BUS); - busmaster_disable_on_bus((buses >> 8) & 0xff); - } + if (hdr != PCI_HEADER_TYPE_BRIDGE && + hdr != PCI_HEADER_TYPE_CARDBUS) + continue; + + /* + * If secondary bus is equal to current bus bypass + * the bridge because it's likely unconfigured and + * would cause infinite recursion. + */ + int secbus = pci_read_config8(dev, PCI_SECONDARY_BUS); + + if (secbus == bus) + continue; + + busmaster_disable_on_bus(secbus); } } } |