[PATCH] pciehp: allow bridged card hotplug

This patch fixes bugs in the pciehp driver that prevent hot-add
of a card with PCI bridges on it.

Signed-off-by: Rajesh Shah <rajesh.shah@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 28 insertions, 24 deletions

diff --git a/drivers/pci/hotplug/pciehp_pci.c b/drivers/pci/hotplug/pciehp_pci.c
index 647673a7d224..4017fb03a0b8 100644
--- a/drivers/pci/hotplug/pciehp_pci.c
+++ b/drivers/pci/hotplug/pciehp_pci.c
@@ -34,6 +34,31 @@
 #include "../pci.h"
 #include "pciehp.h"
 
+static int pciehp_add_bridge(struct pci_dev *dev)
+{
+        struct pci_bus *parent = dev->bus;
+        int pass, busnr, start = parent->secondary;
+        int end = parent->subordinate;
+
+        for (busnr = start; busnr <= end; busnr++) {
+                if (!pci_find_bus(pci_domain_nr(parent), busnr))
+                        break;
+        }
+        if (busnr-- > end) {
+                err("No bus number available for hot-added bridge %s\n",
+                                pci_name(dev));
+                return -1;
+        }
+        for (pass = 0; pass < 2; pass++)
+                busnr = pci_scan_bridge(parent, dev, busnr, pass);
+        if (!dev->subordinate)
+                return -1;
+        pci_bus_size_bridges(dev->subordinate);
+        pci_bus_assign_resources(parent);
+        pci_enable_bridges(parent);
+        pci_bus_add_devices(parent);
+        return 0;
+}
 
 int pciehp_configure_device(struct slot *p_slot)
 {
@@ -55,8 +80,8 @@ int pciehp_configure_device(struct slot *p_slot)
         }
 
         for (fn = 0; fn < 8; fn++) {
-                if (!(dev = pci_find_slot(p_slot->bus,
-                                        PCI_DEVFN(p_slot->device, fn))))
+                dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, fn));
+                if (!dev)
                         continue;
                 if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
                         err("Cannot hot-add display device %s\n",
@@ -65,27 +90,7 @@ int pciehp_configure_device(struct slot *p_slot)
                 }
                 if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) ||
                                 (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) {
-                        /* Find an unused bus number for the new bridge */
-                        struct pci_bus *child;
-                        unsigned char busnr, start = parent->secondary;
-                        unsigned char end = parent->subordinate;
-                        for (busnr = start; busnr <= end; busnr++) {
-                                if (!pci_find_bus(pci_domain_nr(parent),
-                                                        busnr))
-                                        break;
-                        }
-                        if (busnr >= end) {
-                                err("No free bus for hot-added bridge\n");
-                                continue;
-                        }
-                        child = pci_add_new_bus(parent, dev, busnr);
-                        if (!child) {
-                                err("Cannot add new bus for %s\n",
-                                                pci_name(dev));
-                                continue;
-                        }
-                        child->subordinate = pci_do_scan_bus(child);
-                        pci_bus_size_bridges(child);
+                        pciehp_add_bridge(dev);
                 }
                 /* TBD: program firmware provided _HPP values */
                 /* program_fw_provided_values(dev); */
@@ -93,7 +98,6 @@ int pciehp_configure_device(struct slot *p_slot)
 
         pci_bus_assign_resources(parent);
         pci_bus_add_devices(parent);
-        pci_enable_bridges(parent);
         return 0;
 }