1 files changed, 2 insertions, 0 deletions

diff --git a/arch/x86/pci/pcbios.c b/arch/x86/pci/pcbios.c
index a5f7d0d63de..f6855355146 100644
--- a/arch/x86/pci/pcbios.c
+++ b/arch/x86/pci/pcbios.c
@@ -181,6 +181,7 @@ static int pci_bios_read(unsigned int seg, unsigned int bus,
         unsigned long flags;
         unsigned long bx = (bus << 8) | devfn;
 
+        WARN_ON(seg);
         if (!value || (bus > 255) || (devfn > 255) || (reg > 255))
                 return -EINVAL;
 
@@ -247,6 +248,7 @@ static int pci_bios_write(unsigned int seg, unsigned int bus,
         unsigned long flags;
         unsigned long bx = (bus << 8) | devfn;
 
+        WARN_ON(seg);
         if ((bus > 255) || (devfn > 255) || (reg > 255)) 
                 return -EINVAL;