5 files changed, 56 insertions, 49 deletions

diff --git a/drivers/pci/hotplug/acpi_pcihp.c b/drivers/pci/hotplug/acpi_pcihp.c
index 93e37f0666ab..e17ef54f0efc 100644
--- a/drivers/pci/hotplug/acpi_pcihp.c
+++ b/drivers/pci/hotplug/acpi_pcihp.c
@@ -382,7 +382,7 @@ EXPORT_SYMBOL_GPL(acpi_get_hp_params_from_firmware);
 int acpi_get_hp_hw_control_from_firmware(struct pci_dev *dev, u32 flags)
 {
         acpi_status status;
-        acpi_handle chandle, handle = DEVICE_ACPI_HANDLE(&(dev->dev));
+        acpi_handle chandle, handle;
         struct pci_dev *pdev = dev;
         struct pci_bus *parent;
         struct acpi_buffer string = { ACPI_ALLOCATE_BUFFER, NULL };
@@ -399,10 +399,25 @@ int acpi_get_hp_hw_control_from_firmware(struct pci_dev *dev, u32 flags)
          * Per PCI firmware specification, we should run the ACPI _OSC
          * method to get control of hotplug hardware before using it. If
          * an _OSC is missing, we look for an OSHP to do the same thing.
-         * To handle different BIOS behavior, we look for _OSC and OSHP
-         * within the scope of the hotplug controller and its parents,
+         * To handle different BIOS behavior, we look for _OSC on a root
+         * bridge preferentially (according to PCI fw spec). Later for
+         * OSHP within the scope of the hotplug controller and its parents,
          * upto the host bridge under which this controller exists.
          */
+        handle = acpi_find_root_bridge_handle(pdev);
+        if (handle) {
+                acpi_get_name(handle, ACPI_FULL_PATHNAME, &string);
+                dbg("Trying to get hotplug control for %s\n",
+                                (char *)string.pointer);
+                status = pci_osc_control_set(handle, flags);
+                if (ACPI_SUCCESS(status))
+                        goto got_one;
+                kfree(string.pointer);
+                string = (struct acpi_buffer){ ACPI_ALLOCATE_BUFFER, NULL };
+        }
+
+        pdev = dev;
+        handle = DEVICE_ACPI_HANDLE(&dev->dev);
         while (!handle) {
                 /*
                  * This hotplug controller was not listed in the ACPI name
@@ -427,15 +442,9 @@ int acpi_get_hp_hw_control_from_firmware(struct pci_dev *dev, u32 flags)
                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &string);
                 dbg("Trying to get hotplug control for %s \n",
                     (char *)string.pointer);
-                status = pci_osc_control_set(handle, flags);
-                if (status == AE_NOT_FOUND)
-                        status = acpi_run_oshp(handle);
-                if (ACPI_SUCCESS(status)) {
-                        dbg("Gained control for hotplug HW for pci %s (%s)\n",
-                            pci_name(dev), (char *)string.pointer);
-                        kfree(string.pointer);
-                        return 0;
-                }
+                status = acpi_run_oshp(handle);
+                if (ACPI_SUCCESS(status))
+                        goto got_one;
                 if (acpi_root_bridge(handle))
                         break;
                 chandle = handle;
@@ -449,6 +458,11 @@ int acpi_get_hp_hw_control_from_firmware(struct pci_dev *dev, u32 flags)
 
         kfree(string.pointer);
         return -ENODEV;
+got_one:
+        dbg("Gained control for hotplug HW for pci %s (%s)\n", pci_name(dev),
+                        (char *)string.pointer);
+        kfree(string.pointer);
+        return 0;
 }
 EXPORT_SYMBOL(acpi_get_hp_hw_control_from_firmware);
 
diff --git a/drivers/pci/hotplug/pciehp.h b/drivers/pci/hotplug/pciehp.h
index e3a1e7e7dba2..9e6cec67e1cc 100644
--- a/drivers/pci/hotplug/pciehp.h
+++ b/drivers/pci/hotplug/pciehp.h
@@ -43,7 +43,6 @@ extern int pciehp_poll_mode;
 extern int pciehp_poll_time;
 extern int pciehp_debug;
 extern int pciehp_force;
-extern int pciehp_slot_with_bus;
 extern struct workqueue_struct *pciehp_wq;
 
 #define dbg(format, arg...)                                             \
diff --git a/drivers/pci/hotplug/pciehp_core.c b/drivers/pci/hotplug/pciehp_core.c
index 3677495c4f91..4fd5355bc3b5 100644
--- a/drivers/pci/hotplug/pciehp_core.c
+++ b/drivers/pci/hotplug/pciehp_core.c
@@ -41,7 +41,6 @@ int pciehp_debug;
 int pciehp_poll_mode;
 int pciehp_poll_time;
 int pciehp_force;
-int pciehp_slot_with_bus;
 struct workqueue_struct *pciehp_wq;
 
 #define DRIVER_VERSION  "0.4"
@@ -56,12 +55,10 @@ module_param(pciehp_debug, bool, 0644);
 module_param(pciehp_poll_mode, bool, 0644);
 module_param(pciehp_poll_time, int, 0644);
 module_param(pciehp_force, bool, 0644);
-module_param(pciehp_slot_with_bus, bool, 0644);
 MODULE_PARM_DESC(pciehp_debug, "Debugging mode enabled or not");
 MODULE_PARM_DESC(pciehp_poll_mode, "Using polling mechanism for hot-plug events or not");
 MODULE_PARM_DESC(pciehp_poll_time, "Polling mechanism frequency, in seconds");
 MODULE_PARM_DESC(pciehp_force, "Force pciehp, even if _OSC and OSHP are missing");
-MODULE_PARM_DESC(pciehp_slot_with_bus, "Use bus number in the slot name");
 
 #define PCIE_MODULE_NAME "pciehp"
 
@@ -194,6 +191,7 @@ static int init_slots(struct controller *ctrl)
         struct slot *slot;
         struct hotplug_slot *hotplug_slot;
         struct hotplug_slot_info *info;
+        int len, dup = 1;
         int retval = -ENOMEM;
 
         list_for_each_entry(slot, &ctrl->slot_list, slot_list) {
@@ -220,15 +218,24 @@ static int init_slots(struct controller *ctrl)
                 dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x "
                     "slot_device_offset=%x\n", slot->bus, slot->device,
                     slot->hp_slot, slot->number, ctrl->slot_device_offset);
+duplicate_name:
                 retval = pci_hp_register(hotplug_slot,
                                          ctrl->pci_dev->subordinate,
                                          slot->device);
                 if (retval) {
+                        /*
+                         * If slot N already exists, we'll try to create
+                         * slot N-1, N-2 ... N-M, until we overflow.
+                         */
+                        if (retval == -EEXIST) {
+                                len = snprintf(slot->name, SLOT_NAME_SIZE,
+                                               "%d-%d", slot->number, dup++);
+                                if (len < SLOT_NAME_SIZE)
+                                        goto duplicate_name;
+                                else
+                                        err("duplicate slot name overflow\n");
+                        }
                         err("pci_hp_register failed with error %d\n", retval);
-                        if (retval == -EEXIST)
-                                err("Failed to register slot because of name "
-                                    "collision. Try \'pciehp_slot_with_bus\' "
-                                    "module option.\n");
                         goto error_info;
                 }
                 /* create additional sysfs entries */
diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
index ad27e9e225a6..ab31f5ba665d 100644
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c
@@ -1030,15 +1030,6 @@ static void pcie_shutdown_notification(struct controller *ctrl)
         pciehp_free_irq(ctrl);
 }
 
-static void make_slot_name(struct slot *slot)
-{
-        if (pciehp_slot_with_bus)
-                snprintf(slot->name, SLOT_NAME_SIZE, "%04d_%04d",
-                         slot->bus, slot->number);
-        else
-                snprintf(slot->name, SLOT_NAME_SIZE, "%d", slot->number);
-}
-
 static int pcie_init_slot(struct controller *ctrl)
 {
         struct slot *slot;
@@ -1053,7 +1044,7 @@ static int pcie_init_slot(struct controller *ctrl)
         slot->device = ctrl->slot_device_offset + slot->hp_slot;
         slot->hpc_ops = ctrl->hpc_ops;
         slot->number = ctrl->first_slot;
-        make_slot_name(slot);
+        snprintf(slot->name, SLOT_NAME_SIZE, "%d", slot->number);
         mutex_init(&slot->lock);
         INIT_DELAYED_WORK(&slot->work, pciehp_queue_pushbutton_work);
         list_add(&slot->slot_list, &ctrl->slot_list);
diff --git a/drivers/pci/hotplug/shpchp_core.c b/drivers/pci/hotplug/shpchp_core.c
index a8cbd039b85b..cc38615395f1 100644
--- a/drivers/pci/hotplug/shpchp_core.c
+++ b/drivers/pci/hotplug/shpchp_core.c
@@ -39,7 +39,6 @@
 int shpchp_debug;
 int shpchp_poll_mode;
 int shpchp_poll_time;
-static int shpchp_slot_with_bus;
 struct workqueue_struct *shpchp_wq;
 
 #define DRIVER_VERSION  "0.4"
@@ -53,11 +52,9 @@ MODULE_LICENSE("GPL");
 module_param(shpchp_debug, bool, 0644);
 module_param(shpchp_poll_mode, bool, 0644);
 module_param(shpchp_poll_time, int, 0644);
-module_param(shpchp_slot_with_bus, bool, 0644);
 MODULE_PARM_DESC(shpchp_debug, "Debugging mode enabled or not");
 MODULE_PARM_DESC(shpchp_poll_mode, "Using polling mechanism for hot-plug events or not");
 MODULE_PARM_DESC(shpchp_poll_time, "Polling mechanism frequency, in seconds");
-MODULE_PARM_DESC(shpchp_slot_with_bus, "Use bus number in the slot name");
 
 #define SHPC_MODULE_NAME "shpchp"
 
@@ -99,23 +96,13 @@ static void release_slot(struct hotplug_slot *hotplug_slot)
         kfree(slot);
 }
 
-static void make_slot_name(struct slot *slot)
-{
-        if (shpchp_slot_with_bus)
-                snprintf(slot->hotplug_slot->name, SLOT_NAME_SIZE, "%04d_%04d",
-                         slot->bus, slot->number);
-        else
-                snprintf(slot->hotplug_slot->name, SLOT_NAME_SIZE, "%d",
-                         slot->number);
-}
-
 static int init_slots(struct controller *ctrl)
 {
         struct slot *slot;
         struct hotplug_slot *hotplug_slot;
         struct hotplug_slot_info *info;
         int retval = -ENOMEM;
-        int i;
+        int i, len, dup = 1;
 
         for (i = 0; i < ctrl->num_slots; i++) {
                 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
@@ -146,7 +133,7 @@ static int init_slots(struct controller *ctrl)
                 /* register this slot with the hotplug pci core */
                 hotplug_slot->private = slot;
                 hotplug_slot->release = &release_slot;
-                make_slot_name(slot);
+                snprintf(slot->name, SLOT_NAME_SIZE, "%d", slot->number);
                 hotplug_slot->ops = &shpchp_hotplug_slot_ops;
 
                 get_power_status(hotplug_slot, &info->power_status);
@@ -157,14 +144,23 @@ static int init_slots(struct controller *ctrl)
                 dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x "
                     "slot_device_offset=%x\n", slot->bus, slot->device,
                     slot->hp_slot, slot->number, ctrl->slot_device_offset);
+duplicate_name:
                 retval = pci_hp_register(slot->hotplug_slot,
                                 ctrl->pci_dev->subordinate, slot->device);
                 if (retval) {
+                        /*
+                         * If slot N already exists, we'll try to create
+                         * slot N-1, N-2 ... N-M, until we overflow.
+                         */
+                        if (retval == -EEXIST) {
+                                len = snprintf(slot->name, SLOT_NAME_SIZE,
+                                               "%d-%d", slot->number, dup++);
+                                if (len < SLOT_NAME_SIZE)
+                                        goto duplicate_name;
+                                else
+                                        err("duplicate slot name overflow\n");
+                        }
                         err("pci_hp_register failed with error %d\n", retval);
-                        if (retval == -EEXIST)
-                                err("Failed to register slot because of name "
-                                    "collision. Try \'shpchp_slot_with_bus\' "
-                                    "module option.\n");
                         goto error_info;
                 }