PCI: remove initial bios sort of PCI devices on x86

We currently keep 2 lists of PCI devices in the system, one in the
driver core, and one all on its own.  This second list is sorted at boot
time, in "BIOS" order, to try to remain compatible with older kernels
(2.2 and earlier days).  There was also a "nosort" option to turn this
sorting off, to remain compatible with even older kernel versions, but
that just ends up being what we have been doing from 2.5 days...

Unfortunately, the second list of devices is not really ever used to 
determine the probing order of PCI devices or drivers[1].  That is done
using the driver core list instead.  This change happened back in the
early 2.5 days.

Relying on BIOS ording for the binding of drivers to specific device
names is problematic for many reasons, and userspace tools like udev
exist to properly name devices in a persistant manner if that is needed,
no reliance on the BIOS is needed.

Matt Domsch and others at Dell noticed this back in 2006, and added a
boot option to sort the PCI device lists (both of them) in a
breadth-first manner to help remain compatible with the 2.4 order, if
needed for any reason.  This option is not going away, as some systems
rely on them.

This patch removes the sorting of the internal PCI device list in "BIOS"
mode, as it's not needed at all anymore, and hasn't for many years.
I've also removed the PCI flags for this from some other arches that for
some reason defined them, but never used them.

This should not change the ordering of any drivers or device probing.

[1] The old-style pci_get_device and pci_find_device() still used this
sorting order, but there are very few drivers that use these functions,
as they are deprecated for use in this manner.  If for some reason, a
driver rely on the order and uses these functions, the breadth-first
boot option will resolve any problem.

Cc: Matt Domsch <Matt_Domsch@dell.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 0 insertions, 72 deletions

diff --git a/arch/x86/pci/pcbios.c b/arch/x86/pci/pcbios.c
index 2f7109ac4c1..37472fc6f72 100644
--- a/arch/x86/pci/pcbios.c
+++ b/arch/x86/pci/pcbios.c
@@ -152,28 +152,6 @@ static int __devinit check_pcibios(void)
         return 0;
 }
 
-static int __devinit pci_bios_find_device (unsigned short vendor, unsigned short device_id,
-                                        unsigned short index, unsigned char *bus, unsigned char *device_fn)
-{
-        unsigned short bx;
-        unsigned short ret;
-
-        __asm__("lcall *(%%edi); cld\n\t"
-                "jc 1f\n\t"
-                "xor %%ah, %%ah\n"
-                "1:"
-                : "=b" (bx),
-                  "=a" (ret)
-                : "1" (PCIBIOS_FIND_PCI_DEVICE),
-                  "c" (device_id),
-                  "d" (vendor),
-                  "S" ((int) index),
-                  "D" (&pci_indirect));
-        *bus = (bx >> 8) & 0xff;
-        *device_fn = bx & 0xff;
-        return (int) (ret & 0xff00) >> 8;
-}
-
 static int pci_bios_read(unsigned int seg, unsigned int bus,
                          unsigned int devfn, int reg, int len, u32 *value)
 {
@@ -364,55 +342,6 @@ static struct pci_raw_ops * __devinit pci_find_bios(void)
 }
 
 /*
- * Sort the device list according to PCI BIOS. Nasty hack, but since some
- * fool forgot to define the `correct' device order in the PCI BIOS specs
- * and we want to be (possibly bug-to-bug ;-]) compatible with older kernels
- * which used BIOS ordering, we are bound to do this...
- */
-
-void __devinit pcibios_sort(void)
-{
-        LIST_HEAD(sorted_devices);
-        struct list_head *ln;
-        struct pci_dev *dev, *d;
-        int idx, found;
-        unsigned char bus, devfn;
-
-        DBG("PCI: Sorting device list...\n");
-        while (!list_empty(&pci_devices)) {
-                ln = pci_devices.next;
-                dev = pci_dev_g(ln);
-                idx = found = 0;
-                while (pci_bios_find_device(dev->vendor, dev->device, idx, &bus, &devfn) == PCIBIOS_SUCCESSFUL) {
-                        idx++;
-                        list_for_each(ln, &pci_devices) {
-                                d = pci_dev_g(ln);
-                                if (d->bus->number == bus && d->devfn == devfn) {
-                                        list_move_tail(&d->global_list, &sorted_devices);
-                                        if (d == dev)
-                                                found = 1;
-                                        break;
-                                }
-                        }
-                        if (ln == &pci_devices) {
-                                printk(KERN_WARNING "PCI: BIOS reporting unknown device %02x:%02x\n", bus, devfn);
-                                /*
-                                 * We must not continue scanning as several buggy BIOSes
-                                 * return garbage after the last device. Grr.
-                                 */
-                                break;
-                        }
-                }
-                if (!found) {
-                        printk(KERN_WARNING "PCI: Device %s not found by BIOS\n",
-                                pci_name(dev));
-                        list_move_tail(&dev->global_list, &sorted_devices);
-                }
-        }
-        list_splice(&sorted_devices, &pci_devices);
-}
-
-/*
  *  BIOS Functions for IRQ Routing
  */
 
@@ -495,7 +424,6 @@ 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;
         }
 }