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-rw-r--r--src/drivers/usb/pci_ehci.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/drivers/usb/pci_ehci.c b/src/drivers/usb/pci_ehci.c
index e0f88ec098..c05129163e 100644
--- a/src/drivers/usb/pci_ehci.c
+++ b/src/drivers/usb/pci_ehci.c
@@ -34,6 +34,10 @@ int ehci_debug_hw_enable(unsigned int *base, unsigned int *dbg_offset)
{
pci_devfn_t dbg_dev = pci_ehci_dbg_dev(CONFIG_USBDEBUG_HCD_INDEX);
+ /* We only support controllers on bus 0. */
+ if (PCI_DEV2SEGBUS(dbg_dev) != 0)
+ return -1;
+
#ifdef __SIMPLE_DEVICE__
pci_devfn_t dev = dbg_dev;
#else