[PATCH] PCI: Give PCI config access initialization a defined ordering

I moved it to a separate function which is safer.

This avoids problems with the linker reordering them and the
less useful PCI config space access methods taking priority
over the better ones.

Fixes some problems with broken MMCONFIG

Cc: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

arch/i386/pci/Makefile

@@ -1,4 +1,4 @@
-obj-y				:= i386.o
+obj-y				:= i386.o init.o
 
 obj-$(CONFIG_PCI_BIOS)		+= pcbios.o
 obj-$(CONFIG_PCI_MMCONFIG)	+= mmconfig.o direct.o

arch/i386/pci/direct.c

@@ -245,7 +245,7 @@ static int __init pci_check_type2(void)
 	return works;
 }
 
-static int __init pci_direct_init(void)
+void __init pci_direct_init(void)
 {
 	struct resource *region, *region2;
 
@@ -258,32 +258,27 @@ static int __init pci_direct_init(void)
 	if (pci_check_type1()) {
 		printk(KERN_INFO "PCI: Using configuration type 1\n");
 		raw_pci_ops = &pci_direct_conf1;
-		return 0;
+		return;
 	}
 	release_resource(region);
 
  type2:
 	if ((pci_probe & PCI_PROBE_CONF2) == 0)
-		goto out;
+		return;
 	region = request_region(0xCF8, 4, "PCI conf2");
 	if (!region)
-		goto out;
+		return;
 	region2 = request_region(0xC000, 0x1000, "PCI conf2");
 	if (!region2)
 		goto fail2;
 
 	if (pci_check_type2()) {
 		printk(KERN_INFO "PCI: Using configuration type 2\n");
 		raw_pci_ops = &pci_direct_conf2;
-		return 0;
+		return;
 	}
 
 	release_resource(region2);
  fail2:
 	release_resource(region);
-
- out:
-	return 0;
 }
-
-arch_initcall(pci_direct_init);

arch/i386/pci/init.c

@@ -0,0 +1,25 @@
+#include <linux/config.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include "pci.h"
+
+/* arch_initcall has too random ordering, so call the initializers
+   in the right sequence from here. */
+static __init int pci_access_init(void)
+{
+#ifdef CONFIG_PCI_MMCONFIG
+	pci_mmcfg_init();
+#endif
+	if (raw_pci_ops)
+		return 0;
+#ifdef CONFIG_PCI_BIOS
+	pci_pcbios_init();
+#endif
+	if (raw_pci_ops)
+		return 0;
+#ifdef CONFIG_PCI_DIRECT
+	pci_direct_init();
+#endif
+	return 0;
+}
+arch_initcall(pci_access_init);

arch/i386/pci/mmconfig.c

@@ -172,25 +172,20 @@ static __init void unreachable_devices(void)
 	}
 }
 
-static int __init pci_mmcfg_init(void)
+void __init pci_mmcfg_init(void)
 {
 	if ((pci_probe & PCI_PROBE_MMCONF) == 0)
-		goto out;
+		return;
 
 	acpi_table_parse(ACPI_MCFG, acpi_parse_mcfg);
 	if ((pci_mmcfg_config_num == 0) ||
 	    (pci_mmcfg_config == NULL) ||
 	    (pci_mmcfg_config[0].base_address == 0))
-		goto out;
+		return;
 
 	printk(KERN_INFO "PCI: Using MMCONFIG\n");
 	raw_pci_ops = &pci_mmcfg;
 	pci_probe = (pci_probe & ~PCI_PROBE_MASK) | PCI_PROBE_MMCONF;
 
 	unreachable_devices();
-
- out:
-	return 0;
 }
-
-arch_initcall(pci_mmcfg_init);

arch/i386/pci/pcbios.c

@@ -476,14 +476,12 @@ int pcibios_set_irq_routing(struct pci_dev *dev, int pin, int irq)
 }
 EXPORT_SYMBOL(pcibios_set_irq_routing);
 
-static int __init pci_pcbios_init(void)
+void __init pci_pcbios_init(void)
 {
 	if ((pci_probe & PCI_PROBE_BIOS) 
 		&& ((raw_pci_ops = pci_find_bios()))) {
 		pci_probe |= PCI_BIOS_SORT;
 		pci_bios_present = 1;
 	}
-	return 0;
 }
 
-arch_initcall(pci_pcbios_init);

arch/i386/pci/pci.h

@@ -80,4 +80,7 @@ extern int pci_conf1_write(unsigned int seg, unsigned int bus,
 extern int pci_conf1_read(unsigned int seg, unsigned int bus,
 			  unsigned int devfn, int reg, int len, u32 *value);
 
+extern void pci_direct_init(void);
+extern void pci_pcbios_init(void);
+extern void pci_mmcfg_init(void);
 

arch/x86_64/pci/Makefile

@@ -7,7 +7,7 @@ CFLAGS += -Iarch/i386/pci
 
 obj-y		:= i386.o
 obj-$(CONFIG_PCI_DIRECT)+= direct.o
-obj-y		+= fixup.o
+obj-y		+= fixup.o init.o
 obj-$(CONFIG_ACPI)	+= acpi.o
 obj-y			+= legacy.o irq.o common.o
 # mmconfig has a 64bit special
@@ -22,3 +22,4 @@ irq-y    += ../../i386/pci/irq.o
 common-y += ../../i386/pci/common.o
 fixup-y  += ../../i386/pci/fixup.o
 i386-y  += ../../i386/pci/i386.o
+init-y += ../../i386/pci/init.o