PCI: don't say we claimed a resource if we failed

[safe/jmp/linux-2.6] / drivers / pci / probe.c

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 2a94309..882bd8d 100644 (file)
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -174,14 +174,19 @@ int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
        pci_read_config_dword(dev, pos, &sz);
        pci_write_config_dword(dev, pos, l);
 
+       if (!sz)
+               goto fail;      /* BAR not implemented */
+
        /*
         * All bits set in sz means the device isn't working properly.
-        * If the BAR isn't implemented, all bits must be 0.  If it's a
-        * memory BAR or a ROM, bit 0 must be clear; if it's an io BAR, bit
-        * 1 must be clear.
+        * If it's a memory BAR or a ROM, bit 0 must be clear; if it's
+        * an io BAR, bit 1 must be clear.
         */
-       if (!sz || sz == 0xffffffff)
+       if (sz == 0xffffffff) {
+               dev_err(&dev->dev, "reg %x: invalid size %#x; broken device?\n",
+                       pos, sz);
                goto fail;
+       }
 
        /*
         * I don't know how l can have all bits set.  Copied from old code.
@@ -244,13 +249,17 @@ int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
                                   pos, res);
                }
        } else {
-               sz = pci_size(l, sz, mask);
+               u32 size = pci_size(l, sz, mask);
 
-               if (!sz)
+               if (!size) {
+                       dev_err(&dev->dev, "reg %x: invalid size "
+                               "(l %#x sz %#x mask %#x); broken device?",
+                               pos, l, sz, mask);
                        goto fail;
+               }
 
                res->start = l;
-               res->end = l + sz;
+               res->end = l + size;
 
                dev_printk(KERN_DEBUG, &dev->dev, "reg %x: %pR\n", pos, res);
        }
@@ -312,7 +321,7 @@ static void __devinit pci_read_bridge_io(struct pci_bus *child)
                dev_printk(KERN_DEBUG, &dev->dev, "  bridge window %pR\n", res);
        } else {
                dev_printk(KERN_DEBUG, &dev->dev,
-                        "  bridge window [io  %04lx - %04lx] reg reading\n",
+                        "  bridge window [io  %#06lx-%#06lx] (disabled)\n",
                                 base, limit);
        }
 }
@@ -336,7 +345,7 @@ static void __devinit pci_read_bridge_mmio(struct pci_bus *child)
                dev_printk(KERN_DEBUG, &dev->dev, "  bridge window %pR\n", res);
        } else {
                dev_printk(KERN_DEBUG, &dev->dev,
-                       "  bridge window [mem 0x%08lx - 0x%08lx] reg reading\n",
+                       "  bridge window [mem %#010lx-%#010lx] (disabled)\n",
                                         base, limit + 0xfffff);
        }
 }
@@ -387,7 +396,7 @@ static void __devinit pci_read_bridge_mmio_pref(struct pci_bus *child)
                dev_printk(KERN_DEBUG, &dev->dev, "  bridge window %pR\n", res);
        } else {
                dev_printk(KERN_DEBUG, &dev->dev,
-                    "  bridge window [mem 0x%08lx - %08lx pref] reg reading\n",
+                    "  bridge window [mem %#010lx-%#010lx pref] (disabled)\n",
                                         base, limit + 0xfffff);
        }
 }
@@ -673,16 +682,20 @@ int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max,
        int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS);
        u32 buses, i, j = 0;
        u16 bctl;
+       u8 primary, secondary, subordinate;
        int broken = 0;
 
        pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses);
+       primary = buses & 0xFF;
+       secondary = (buses >> 8) & 0xFF;
+       subordinate = (buses >> 16) & 0xFF;
 
-       dev_dbg(&dev->dev, "scanning behind bridge, config %06x, pass %d\n",
-               buses & 0xffffff, pass);
+       dev_dbg(&dev->dev, "scanning [bus %02x-%02x] behind bridge, pass %d\n",
+               secondary, subordinate, pass);
 
        /* Check if setup is sensible at all */
        if (!pass &&
-           ((buses & 0xff) != bus->number || ((buses >> 8) & 0xff) <= bus->number)) {
+           (primary != bus->number || secondary <= bus->number)) {
                dev_dbg(&dev->dev, "bus configuration invalid, reconfiguring\n");
                broken = 1;
        }
@@ -693,15 +706,15 @@ int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max,
        pci_write_config_word(dev, PCI_BRIDGE_CONTROL,
                              bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT);
 
-       if ((buses & 0xffff00) && !pcibios_assign_all_busses() && !is_cardbus && !broken) {
-               unsigned int cmax, busnr;
+       if ((secondary || subordinate) && !pcibios_assign_all_busses() &&
+           !is_cardbus && !broken) {
+               unsigned int cmax;
                /*
                 * Bus already configured by firmware, process it in the first
                 * pass and just note the configuration.
                 */
                if (pass)
                        goto out;
-               busnr = (buses >> 8) & 0xFF;
 
                /*
                 * If we already got to this bus through a different bridge,
@@ -710,13 +723,13 @@ int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max,
                 * However, we continue to descend down the hierarchy and
                 * scan remaining child buses.
                 */
-               child = pci_find_bus(pci_domain_nr(bus), busnr);
+               child = pci_find_bus(pci_domain_nr(bus), secondary);
                if (!child) {
-                       child = pci_add_new_bus(bus, dev, busnr);
+                       child = pci_add_new_bus(bus, dev, secondary);
                        if (!child)
                                goto out;
-                       child->primary = buses & 0xFF;
-                       child->subordinate = (buses >> 16) & 0xFF;
+                       child->primary = primary;
+                       child->subordinate = subordinate;
                        child->bridge_ctl = bctl;
                }