From 95cb9093960b6249fdbe7417bf513a1358aaa51a Mon Sep 17 00:00:00 2001 From: Kenji Kaneshige Date: Mon, 20 Oct 2008 17:40:57 -0600 Subject: [PATCH] PCI Hotplug: serialize pci_hp_register and pci_hp_deregister Convert the pci_hotplug_slot_list_lock, which only protected the list of hotplug slots, to a pci_hp_mutex which now protects both interfaces. Signed-off-by: Kenji Kaneshige Signed-off-by: Alex Chiang Signed-off-by: Jesse Barnes --- drivers/pci/hotplug/pci_hotplug_core.c | 51 ++++++++++++++------------ 1 file changed, 28 insertions(+), 23 deletions(-) diff --git a/drivers/pci/hotplug/pci_hotplug_core.c b/drivers/pci/hotplug/pci_hotplug_core.c index 1cdeb642fdcf..e71524825180 100644 --- a/drivers/pci/hotplug/pci_hotplug_core.c +++ b/drivers/pci/hotplug/pci_hotplug_core.c @@ -37,6 +37,7 @@ #include #include #include +#include #include #include #include @@ -61,7 +62,7 @@ static int debug; ////////////////////////////////////////////////////////////////// static LIST_HEAD(pci_hotplug_slot_list); -static DEFINE_SPINLOCK(pci_hotplug_slot_list_lock); +static DEFINE_MUTEX(pci_hp_mutex); /* these strings match up with the values in pci_bus_speed */ static char *pci_bus_speed_strings[] = { @@ -530,16 +531,12 @@ static struct hotplug_slot *get_slot_from_name (const char *name) struct hotplug_slot *slot; struct list_head *tmp; - spin_lock(&pci_hotplug_slot_list_lock); list_for_each (tmp, &pci_hotplug_slot_list) { slot = list_entry (tmp, struct hotplug_slot, slot_list); if (strcmp(slot->name, name) == 0) - goto out; + return slot; } - slot = NULL; -out: - spin_unlock(&pci_hotplug_slot_list_lock); - return slot; + return NULL; } /** @@ -570,9 +567,13 @@ int pci_hp_register(struct hotplug_slot *slot, struct pci_bus *bus, int slot_nr, return -EINVAL; } + mutex_lock(&pci_hp_mutex); + /* Check if we have already registered a slot with the same name. */ - if (get_slot_from_name(name)) - return -EEXIST; + if (get_slot_from_name(name)) { + result = -EEXIST; + goto out; + } /* * No problems if we call this interface from both ACPI_PCI_SLOT @@ -580,13 +581,15 @@ int pci_hp_register(struct hotplug_slot *slot, struct pci_bus *bus, int slot_nr, * pci_slot, the interface will simply bump the refcount. */ pci_slot = pci_create_slot(bus, slot_nr, name, slot); - if (IS_ERR(pci_slot)) - return PTR_ERR(pci_slot); + if (IS_ERR(pci_slot)) { + result = PTR_ERR(pci_slot); + goto cleanup; + } if (pci_slot->hotplug) { dbg("%s: already claimed\n", __func__); - pci_destroy_slot(pci_slot); - return -EBUSY; + result = -EBUSY; + goto cleanup; } slot->pci_slot = pci_slot; @@ -597,21 +600,21 @@ int pci_hp_register(struct hotplug_slot *slot, struct pci_bus *bus, int slot_nr, */ if (strcmp(kobject_name(&pci_slot->kobj), name)) { result = kobject_rename(&pci_slot->kobj, name); - if (result) { - pci_destroy_slot(pci_slot); - return result; - } + if (result) + goto cleanup; } - spin_lock(&pci_hotplug_slot_list_lock); list_add(&slot->slot_list, &pci_hotplug_slot_list); - spin_unlock(&pci_hotplug_slot_list_lock); result = fs_add_slot(pci_slot); kobject_uevent(&pci_slot->kobj, KOBJ_ADD); dbg("Added slot %s to the list\n", name); - +out: + mutex_unlock(&pci_hp_mutex); return result; +cleanup: + pci_destroy_slot(pci_slot); + goto out; } /** @@ -631,13 +634,14 @@ int pci_hp_deregister(struct hotplug_slot *hotplug) if (!hotplug) return -ENODEV; + mutex_lock(&pci_hp_mutex); temp = get_slot_from_name(hotplug->name); - if (temp != hotplug) + if (temp != hotplug) { + mutex_unlock(&pci_hp_mutex); return -ENODEV; + } - spin_lock(&pci_hotplug_slot_list_lock); list_del(&hotplug->slot_list); - spin_unlock(&pci_hotplug_slot_list_lock); slot = hotplug->pci_slot; fs_remove_slot(slot); @@ -646,6 +650,7 @@ int pci_hp_deregister(struct hotplug_slot *hotplug) hotplug->release(hotplug); slot->hotplug = NULL; pci_destroy_slot(slot); + mutex_unlock(&pci_hp_mutex); return 0; } -- 2.30.2