[PATCH] i386/x86-64: Return defined error value for bad PCI config space accesses

Mostly to get better handling when a extended config space
access has to fallback to Type1.

Cc: gregkh@suse.de
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 9 insertions, 3 deletions

diff --git a/arch/i386/pci/direct.c b/arch/i386/pci/direct.c
index 4457cf3eb401..0659ced01185 100644
--- a/arch/i386/pci/direct.c
+++ b/arch/i386/pci/direct.c
@@ -19,8 +19,10 @@ int pci_conf1_read(unsigned int seg, unsigned int bus,
 {
         unsigned long flags;
 
-        if (!value || (bus > 255) || (devfn > 255) || (reg > 255))
+        if (!value || (bus > 255) || (devfn > 255) || (reg > 255)) {
+                *value = -1;
                 return -EINVAL;
+        }
 
         spin_lock_irqsave(&pci_config_lock, flags);
 
diff --git a/arch/i386/pci/mmconfig.c b/arch/i386/pci/mmconfig.c
index 2002c741a383..f77d7f8b9bf6 100644
--- a/arch/i386/pci/mmconfig.c
+++ b/arch/i386/pci/mmconfig.c
@@ -80,8 +80,10 @@ static int pci_mmcfg_read(unsigned int seg, unsigned int bus,
         unsigned long flags;
         u32 base;
 
-        if (!value || (bus > 255) || (devfn > 255) || (reg > 4095))
+        if (!value || (bus > 255) || (devfn > 255) || (reg > 4095)) {
+                *value = -1;
                 return -EINVAL;
+        }
 
         base = get_base_addr(seg, bus, devfn);
         if (!base)
diff --git a/arch/x86_64/pci/mmconfig.c b/arch/x86_64/pci/mmconfig.c
index d4e25f38287d..b493ed977e7c 100644
--- a/arch/x86_64/pci/mmconfig.c
+++ b/arch/x86_64/pci/mmconfig.c
@@ -75,8 +75,10 @@ static int pci_mmcfg_read(unsigned int seg, unsigned int bus,
         char __iomem *addr;
 
         /* Why do we have this when nobody checks it. How about a BUG()!? -AK */
-        if (unlikely(!value || (bus > 255) || (devfn > 255) || (reg > 4095)))
+        if (unlikely(!value || (bus > 255) || (devfn > 255) || (reg > 4095))) {
+                *value = -1;
                 return -EINVAL;
+        }
 
         addr = pci_dev_base(seg, bus, devfn);
         if (!addr)