[PATCH] x86: Allow disabling early pci scans with pci=noearly or disallowing conf1

Some buggy systems can machine check when config space accesses
happen for some non existent devices.  i386/x86-64 do some early
device scans that might trigger this. Allow pci=noearly to disable
this. Also when type 1 is disabling also don't do any early
accesses which are always type1.

This moves the pci= configuration parsing to be a early parameter.
I don't think this can break anything because it only changes
a single global that is only used by PCI.

Cc: gregkh@suse.de
Cc: Trammell Hudson <hudson@osresearch.net>

Signed-off-by: Andi Kleen <ak@suse.de>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/i386/pci/common.c b/arch/i386/pci/common.c
index 0a362e3aeac5..68bce194e688 100644
--- a/arch/i386/pci/common.c
+++ b/arch/i386/pci/common.c
@@ -242,6 +242,10 @@ char * __devinit  pcibios_setup(char *str)
                 acpi_noirq_set();
                 return NULL;
         }
+        else if (!strcmp(str, "noearly")) {
+                pci_probe |= PCI_PROBE_NOEARLY;
+                return NULL;
+        }
 #ifndef CONFIG_X86_VISWS
         else if (!strcmp(str, "usepirqmask")) {
                 pci_probe |= PCI_USE_PIRQ_MASK;