parisc: advertise PCI devs after "assign_resources"
Grant Grundler [Mon, 20 Apr 2009 04:28:22 +0000 (04:28 +0000)]
Alex Chiang asked me why PARISC was calling pci_bus_add_devices()
and pci_bus_assign_resources() in the opposite order from everyone else.
No reason and I couldn't see any data dependency.
Patch below applies cleanly to 2.6.30-rc2.

Later, I suspected the code worked only because no drivers would be
loaded/ready until much later in the system initialization sequence.

Tested "LBA" code on J6000 (32-bit) and A500 (64-bit SMP) with 2.6.30-rc2.
Not tested with any Dino controllers.
Not tested with PCI-PCI Bridge (TBD).

Reported-by: Alex Chiang <achiang@hp.com>
Signed-off-by: Grant Grundler <grundler@parisc-linux.org>
Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>

drivers/parisc/dino.c
drivers/parisc/lba_pci.c

index 52ae0b1..d327c2d 100644 (file)
@@ -1019,22 +1019,22 @@ static int __init dino_probe(struct parisc_device *dev)
        ** It's not used to avoid chicken/egg problems
        ** with configuration accessor functions.
        */
-       bus = pci_scan_bus_parented(&dev->dev, dino_current_bus,
-                                   &dino_cfg_ops, NULL);
+       dino_dev->hba.hba_bus = bus = pci_scan_bus_parented(&dev->dev,
+                        dino_current_bus, &dino_cfg_ops, NULL);
+
        if(bus) {
-               pci_bus_add_devices(bus);
                /* This code *depends* on scanning being single threaded
                 * if it isn't, this global bus number count will fail
                 */
                dino_current_bus = bus->subordinate + 1;
                pci_bus_assign_resources(bus);
+               pci_bus_add_devices(bus);
        } else {
-               printk(KERN_ERR "ERROR: failed to scan PCI bus on %s (probably duplicate bus number %d)\n",
+               printk(KERN_ERR "ERROR: failed to scan PCI bus on %s (duplicate bus number %d?)\n",
                       dev_name(&dev->dev), dino_current_bus);
                /* increment the bus number in case of duplicates */
                dino_current_bus++;
        }
-       dino_dev->hba.hba_bus = bus;
        return 0;
 }
 
index 59fbbf1..f2661e1 100644 (file)
@@ -1509,10 +1509,6 @@ lba_driver_probe(struct parisc_device *dev)
        lba_bus = lba_dev->hba.hba_bus =
                pci_scan_bus_parented(&dev->dev, lba_dev->hba.bus_num.start,
                                cfg_ops, NULL);
-       if (lba_bus) {
-               lba_next_bus = lba_bus->subordinate + 1;
-               pci_bus_add_devices(lba_bus);
-       }
 
        /* This is in lieu of calling pci_assign_unassigned_resources() */
        if (is_pdc_pat()) {
@@ -1533,7 +1529,6 @@ lba_driver_probe(struct parisc_device *dev)
        }
        pci_enable_bridges(lba_bus);
 
-
        /*
        ** Once PCI register ops has walked the bus, access to config
        ** space is restricted. Avoids master aborts on config cycles.
@@ -1543,6 +1538,11 @@ lba_driver_probe(struct parisc_device *dev)
                lba_dev->flags |= LBA_FLAG_SKIP_PROBE;
        }
 
+       if (lba_bus) {
+               lba_next_bus = lba_bus->subordinate + 1;
+               pci_bus_add_devices(lba_bus);
+       }
+
        /* Whew! Finally done! Tell services we got this one covered. */
        return 0;
 }