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-rw-r--r--drivers/pci/hotplug/pci_hotplug_core.c26
-rw-r--r--drivers/pci/hotplug/pciehp_core.c15
-rw-r--r--drivers/pci/hotplug/shpchp_core.c15
-rw-r--r--drivers/pci/slot.c141
4 files changed, 115 insertions, 82 deletions
diff --git a/drivers/pci/hotplug/pci_hotplug_core.c b/drivers/pci/hotplug/pci_hotplug_core.c
index e7152482518..a6f1f282b68 100644
--- a/drivers/pci/hotplug/pci_hotplug_core.c
+++ b/drivers/pci/hotplug/pci_hotplug_core.c
@@ -569,12 +569,6 @@ int pci_hp_register(struct hotplug_slot *slot, struct pci_bus *bus, int slot_nr,
mutex_lock(&pci_hp_mutex);
- /* Check if we have already registered a slot with the same name. */
- if (get_slot_from_name(name)) {
- result = -EEXIST;
- goto out;
- }
-
/*
* No problems if we call this interface from both ACPI_PCI_SLOT
* driver and call it here again. If we've already created the
@@ -583,27 +577,12 @@ int pci_hp_register(struct hotplug_slot *slot, struct pci_bus *bus, int slot_nr,
pci_slot = pci_create_slot(bus, slot_nr, name, slot);
if (IS_ERR(pci_slot)) {
result = PTR_ERR(pci_slot);
- goto cleanup;
- }
-
- if (pci_slot->hotplug) {
- dbg("%s: already claimed\n", __func__);
- result = -EBUSY;
- goto cleanup;
+ goto out;
}
slot->pci_slot = pci_slot;
pci_slot->hotplug = slot;
- /*
- * Allow pcihp drivers to override the ACPI_PCI_SLOT name.
- */
- if (strcmp(kobject_name(&pci_slot->kobj), name)) {
- result = kobject_rename(&pci_slot->kobj, name);
- if (result)
- goto cleanup;
- }
-
list_add(&slot->slot_list, &pci_hotplug_slot_list);
result = fs_add_slot(pci_slot);
@@ -612,9 +591,6 @@ int pci_hp_register(struct hotplug_slot *slot, struct pci_bus *bus, int slot_nr,
out:
mutex_unlock(&pci_hp_mutex);
return result;
-cleanup:
- pci_destroy_slot(pci_slot);
- goto out;
}
/**
diff --git a/drivers/pci/hotplug/pciehp_core.c b/drivers/pci/hotplug/pciehp_core.c
index 3ace5e05760..af89d7bd1ed 100644
--- a/drivers/pci/hotplug/pciehp_core.c
+++ b/drivers/pci/hotplug/pciehp_core.c
@@ -196,7 +196,6 @@ 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) {
@@ -223,25 +222,11 @@ static int init_slots(struct controller *ctrl)
ctrl_dbg(ctrl, "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,
slot->name);
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
- ctrl_err(ctrl, "duplicate slot name "
- "overflow\n");
- }
ctrl_err(ctrl, "pci_hp_register failed with error %d\n",
retval);
goto error_info;
diff --git a/drivers/pci/hotplug/shpchp_core.c b/drivers/pci/hotplug/shpchp_core.c
index bf5096612aa..cfdd0796364 100644
--- a/drivers/pci/hotplug/shpchp_core.c
+++ b/drivers/pci/hotplug/shpchp_core.c
@@ -102,7 +102,7 @@ static int init_slots(struct controller *ctrl)
struct hotplug_slot *hotplug_slot;
struct hotplug_slot_info *info;
int retval = -ENOMEM;
- int i, len, dup = 1;
+ int i;
for (i = 0; i < ctrl->num_slots; i++) {
slot = kzalloc(sizeof(*slot), GFP_KERNEL);
@@ -144,23 +144,10 @@ 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,
hotplug_slot->name);
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);
goto error_info;
}
diff --git a/drivers/pci/slot.c b/drivers/pci/slot.c
index 0e009c3ba5f..b6ee352ae45 100644
--- a/drivers/pci/slot.c
+++ b/drivers/pci/slot.c
@@ -78,6 +78,77 @@ static struct kobj_type pci_slot_ktype = {
.default_attrs = pci_slot_default_attrs,
};
+static char *make_slot_name(const char *name)
+{
+ char *new_name;
+ int len, max, dup;
+
+ new_name = kstrdup(name, GFP_KERNEL);
+ if (!new_name)
+ return NULL;
+
+ /*
+ * Make sure we hit the realloc case the first time through the
+ * loop. 'len' will be strlen(name) + 3 at that point which is
+ * enough space for "name-X" and the trailing NUL.
+ */
+ len = strlen(name) + 2;
+ max = 1;
+ dup = 1;
+
+ for (;;) {
+ struct kobject *dup_slot;
+ dup_slot = kset_find_obj(pci_slots_kset, new_name);
+ if (!dup_slot)
+ break;
+ kobject_put(dup_slot);
+ if (dup == max) {
+ len++;
+ max *= 10;
+ kfree(new_name);
+ new_name = kmalloc(len, GFP_KERNEL);
+ if (!new_name)
+ break;
+ }
+ sprintf(new_name, "%s-%d", name, dup++);
+ }
+
+ return new_name;
+}
+
+static int rename_slot(struct pci_slot *slot, const char *name)
+{
+ int result = 0;
+ char *slot_name;
+
+ if (strcmp(kobject_name(&slot->kobj), name) == 0)
+ return result;
+
+ slot_name = make_slot_name(name);
+ if (!slot_name)
+ return -ENOMEM;
+
+ result = kobject_rename(&slot->kobj, slot_name);
+ kfree(slot_name);
+
+ return result;
+}
+
+static struct pci_slot *get_slot(struct pci_bus *parent, int slot_nr)
+{
+ struct pci_slot *slot;
+ /*
+ * We already hold pci_bus_sem so don't worry
+ */
+ list_for_each_entry(slot, &parent->slots, list)
+ if (slot->number == slot_nr) {
+ kobject_get(&slot->kobj);
+ return slot;
+ }
+
+ return NULL;
+}
+
/**
* pci_create_slot - create or increment refcount for physical PCI slot
* @parent: struct pci_bus of parent bridge
@@ -90,7 +161,17 @@ static struct kobj_type pci_slot_ktype = {
* either return a new &struct pci_slot to the caller, or if the pci_slot
* already exists, its refcount will be incremented.
*
- * Slots are uniquely identified by a @pci_bus, @slot_nr, @name tuple.
+ * Slots are uniquely identified by a @pci_bus, @slot_nr tuple.
+ *
+ * There are known platforms with broken firmware that assign the same
+ * name to multiple slots. Workaround these broken platforms by renaming
+ * the slots on behalf of the caller. If firmware assigns name N to
+ * multiple slots:
+ *
+ * The first slot is assigned N
+ * The second slot is assigned N-1
+ * The third slot is assigned N-2
+ * etc.
*
* Placeholder slots:
* In most cases, @pci_bus, @slot_nr will be sufficient to uniquely identify
@@ -99,62 +180,67 @@ static struct kobj_type pci_slot_ktype = {
* the slot. In this scenario, the caller may pass -1 for @slot_nr.
*
* The following semantics are imposed when the caller passes @slot_nr ==
- * -1. First, the check for existing %struct pci_slot is skipped, as the
- * caller may know about several unpopulated slots on a given %struct
- * pci_bus, and each slot would have a @slot_nr of -1. Uniqueness for
- * these slots is then determined by the @name parameter. We expect
- * kobject_init_and_add() to warn us if the caller attempts to create
- * multiple slots with the same name. The other change in semantics is
+ * -1. First, we no longer check for an existing %struct pci_slot, as there
+ * may be many slots with @slot_nr of -1. The other change in semantics is
* user-visible, which is the 'address' parameter presented in sysfs will
* consist solely of a dddd:bb tuple, where dddd is the PCI domain of the
* %struct pci_bus and bb is the bus number. In other words, the devfn of
* the 'placeholder' slot will not be displayed.
*/
-
struct pci_slot *pci_create_slot(struct pci_bus *parent, int slot_nr,
const char *name,
struct hotplug_slot *hotplug)
{
struct pci_dev *dev;
struct pci_slot *slot;
- int err;
+ int err = 0;
+ char *slot_name = NULL;
down_write(&pci_bus_sem);
if (slot_nr == -1)
goto placeholder;
- /* If we've already created this slot, bump refcount and return. */
- list_for_each_entry(slot, &parent->slots, list) {
- if (slot->number == slot_nr) {
- kobject_get(&slot->kobj);
- pr_debug("%s: inc refcount to %d on %04x:%02x:%02x\n",
- __func__,
- atomic_read(&slot->kobj.kref.refcount),
- pci_domain_nr(parent), parent->number,
- slot_nr);
- goto out;
+ /*
+ * Hotplug drivers are allowed to rename an existing slot,
+ * but only if not already claimed.
+ */
+ slot = get_slot(parent, slot_nr);
+ if (slot) {
+ if (hotplug) {
+ if ((err = slot->hotplug ? -EBUSY : 0)
+ || (err = rename_slot(slot, name))) {
+ kobject_put(&slot->kobj);
+ slot = NULL;
+ goto err;
+ }
}
+ goto out;
}
placeholder:
slot = kzalloc(sizeof(*slot), GFP_KERNEL);
if (!slot) {
- slot = ERR_PTR(-ENOMEM);
- goto out;
+ err = -ENOMEM;
+ goto err;
}
slot->bus = parent;
slot->number = slot_nr;
slot->kobj.kset = pci_slots_kset;
- err = kobject_init_and_add(&slot->kobj, &pci_slot_ktype, NULL,
- "%s", name);
- if (err) {
- printk(KERN_ERR "Unable to register kobject %s\n", name);
+
+ slot_name = make_slot_name(name);
+ if (!slot_name) {
+ err = -ENOMEM;
goto err;
}
+ err = kobject_init_and_add(&slot->kobj, &pci_slot_ktype, NULL,
+ "%s", slot_name);
+ if (err)
+ goto err;
+
INIT_LIST_HEAD(&slot->list);
list_add(&slot->list, &parent->slots);
@@ -166,10 +252,10 @@ placeholder:
pr_debug("%s: created pci_slot on %04x:%02x:%02x\n",
__func__, pci_domain_nr(parent), parent->number, slot_nr);
- out:
+out:
up_write(&pci_bus_sem);
return slot;
- err:
+err:
kfree(slot);
slot = ERR_PTR(err);
goto out;
@@ -210,7 +296,6 @@ EXPORT_SYMBOL_GPL(pci_renumber_slot);
* just call kobject_put on its kobj and let our release methods do the
* rest.
*/
-
void pci_destroy_slot(struct pci_slot *slot)
{
pr_debug("%s: dec refcount to %d on %04x:%02x:%02x\n", __func__,
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-29 09:36:42 +0000