PCI: don't load acpi_php when acpi is disabled

When acpi=off and pci=nomsi, don't load acpiphp.

Fixes this:

pci_hotplug: PCI Hot Plug PCI Core version: 0.5
acpiphp: ACPI Hot Plug PCI Controller Driver version: 0.5
ACPI Exception (utmutex-0263): AE_BAD_PARAMETER, Thread
FFFF81103CC54000 could not acquire Mutex [1] [20070126]

[akpm@linux-foundation.org: export acpi_pci_disabled for acpiphp.ko]
[akpm@linux-foundation.org: fix return statement]
Signed-off-by: Yinghai Lu <yinghai.lu@sun.com>
Cc: Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

2 files changed, 8 insertions, 1 deletions

diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index 680b7300a489..2cdc9de9371d 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -72,7 +72,8 @@ static inline int acpi_madt_oem_check(char *oem_id, char *oem_table_id) { return
 #define PREFIX                  "ACPI: "
 
 int acpi_noirq;                         /* skip ACPI IRQ initialization */
-int acpi_pci_disabled __initdata;       /* skip ACPI PCI scan and IRQ initialization */
+int acpi_pci_disabled;          /* skip ACPI PCI scan and IRQ initialization */
+EXPORT_SYMBOL(acpi_pci_disabled);
 int acpi_ht __initdata = 1;     /* enable HT */
 
 int acpi_lapic;
diff --git a/drivers/pci/hotplug/acpiphp_core.c b/drivers/pci/hotplug/acpiphp_core.c
index c8c263875c21..9279d5ba62e6 100644
--- a/drivers/pci/hotplug/acpiphp_core.c
+++ b/drivers/pci/hotplug/acpiphp_core.c
@@ -392,6 +392,9 @@ static int __init acpiphp_init(void)
 {
         info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
 
+        if (acpi_pci_disabled)
+                return 0;
+
         acpiphp_debug = debug;
 
         /* read all the ACPI info from the system */
@@ -401,6 +404,9 @@ static int __init acpiphp_init(void)
 
 static void __exit acpiphp_exit(void)
 {
+        if (acpi_pci_disabled)
+                return;
+
         /* deallocate internal data structures etc. */
         acpiphp_glue_exit();
 }