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Date: Wed, 08 Oct 2008 15:33:54 +0900
From: Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>
To: Alex Chiang <achiang@...com>
CC: jbarnes@...tuousgeek.org, kristen.c.accardi@...el.com,
matthew@....cx, linux-pci@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [01/03] Sample patch for [PATCH v4 02/15]
---
drivers/pci/hotplug/pci_hotplug_core.c | 49 +++++++++++++++++----------------
1 file changed, 26 insertions(+), 23 deletions(-)
Index: hotplug/drivers/pci/hotplug/pci_hotplug_core.c
===================================================================
--- hotplug.orig/drivers/pci/hotplug/pci_hotplug_core.c
+++ hotplug/drivers/pci/hotplug/pci_hotplug_core.c
@@ -37,6 +37,7 @@
#include <linux/init.h>
#include <linux/mount.h>
#include <linux/namei.h>
+#include <linux/mutex.h>
#include <linux/pci.h>
#include <linux/pci_hotplug.h>
#include <asm/uaccess.h>
@@ -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_fro
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
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 +581,13 @@ int pci_hp_register(struct hotplug_slot
* pci_slot, the interface will simply bump the refcount.
*/
pci_slot = pci_create_slot(bus, slot_nr, name);
- if (IS_ERR(pci_slot))
- return PTR_ERR(pci_slot);
+ if ((result = IS_ERR(pci_slot)))
+ goto out;
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 +598,21 @@ int pci_hp_register(struct hotplug_slot
*/
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 +632,14 @@ int pci_hp_deregister(struct hotplug_slo
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 +648,7 @@ int pci_hp_deregister(struct hotplug_slo
hotplug->release(hotplug);
slot->hotplug = NULL;
pci_destroy_slot(slot);
+ mutex_unlock(&pci_hp_mutex);
return 0;
}
--
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