1 files changed, 21 insertions, 5 deletions

diff --git a/arch/x86/kernel/early-quirks.c b/arch/x86/kernel/early-quirks.c
index a4665f37cfc5..a0e11c0cc872 100644
--- a/arch/x86/kernel/early-quirks.c
+++ b/arch/x86/kernel/early-quirks.c
@@ -120,7 +120,18 @@ static struct chipset early_qrk[] __initdata = {
         {}
 };
 
-static void __init check_dev_quirk(int num, int slot, int func)
+/**
+ * check_dev_quirk - apply early quirks to a given PCI device
+ * @num: bus number
+ * @slot: slot number
+ * @func: PCI function
+ *
+ * Check the vendor & device ID against the early quirks table.
+ *
+ * If the device is single function, let early_quirks() know so we don't
+ * poke at this device again.
+ */
+static int __init check_dev_quirk(int num, int slot, int func)
 {
         u16 class;
         u16 vendor;
@@ -131,7 +142,7 @@ static void __init check_dev_quirk(int num, int slot, int func)
         class = read_pci_config_16(num, slot, func, PCI_CLASS_DEVICE);
 
         if (class == 0xffff)
-                return;
+                return -1; /* no class, treat as single function */
 
         vendor = read_pci_config_16(num, slot, func, PCI_VENDOR_ID);
 
@@ -154,7 +165,9 @@ static void __init check_dev_quirk(int num, int slot, int func)
         type = read_pci_config_byte(num, slot, func,
                                     PCI_HEADER_TYPE);
         if (!(type & 0x80))
-                return;
+                return -1;
+
+        return 0;
 }
 
 void __init early_quirks(void)
@@ -167,6 +180,9 @@ void __init early_quirks(void)
         /* Poor man's PCI discovery */
         for (num = 0; num < 32; num++)
                 for (slot = 0; slot < 32; slot++)
-                        for (func = 0; func < 8; func++)
-                                check_dev_quirk(num, slot, func);
+                        for (func = 0; func < 8; func++) {
+                                /* Only probe function 0 on single fn devices */
+                                if (check_dev_quirk(num, slot, func))
+                                        break;
+                        }
 }