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Message-Id: <1348080894-23412-36-git-send-email-yinghai@kernel.org>
Date: Wed, 19 Sep 2012 11:54:49 -0700
From: Yinghai Lu <yinghai@...nel.org>
To: Bjorn Helgaas <bhelgaas@...gle.com>, Len Brown <lenb@...nel.org>,
Taku Izumi <izumi.taku@...fujitsu.com>,
Jiang Liu <jiang.liu@...wei.com>, x86 <x86@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-acpi@...r.kernel.org, Yinghai Lu <yinghai@...nel.org>
Subject: [PATCH 35/40] ACPI, PCI: Protect global lists in drivers/acpi/pci_root.c
From: Jiang Liu <jiang.liu@...wei.com>
There are two global lists inf file drivers/acpi/pci_root.c.
One is for registered acpi_pci_drivers, the other is for
enumerated ACPI PCI root bridge objects. These two global
lists may change dynamically when registering/deregistering
acpi_pci_drivers or adding/removing ACPI PCI root bridge
objects. So protect them by mutex lock.
-v2: remove -rcu
Signed-off-by: Jiang Liu <jiang.liu@...wei.com>
Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
drivers/acpi/pci_root.c | 70 +++++++++++++++++++++++++++--------------------
1 files changed, 40 insertions(+), 30 deletions(-)
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index 0ea5ad0..67f7733 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -27,7 +27,7 @@
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
-#include <linux/spinlock.h>
+#include <linux/mutex.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/pci.h>
@@ -71,6 +71,8 @@ static struct acpi_driver acpi_pci_root_driver = {
},
};
+/* Lock to protect both acpi_pci_roots and acpi_pci_drivers lists */
+static DEFINE_MUTEX(acpi_pci_root_lock);
static LIST_HEAD(acpi_pci_roots);
static LIST_HEAD(acpi_pci_drivers);
@@ -81,47 +83,46 @@ int acpi_pci_register_driver(struct acpi_pci_driver *driver)
int n = 0;
struct acpi_pci_root *root;
+ mutex_lock(&acpi_pci_root_lock);
list_add_tail(&driver->node, &acpi_pci_drivers);
-
- if (!driver->add)
- return 0;
-
- list_for_each_entry(root, &acpi_pci_roots, node) {
- driver->add(root);
- n++;
- }
+ if (driver->add)
+ list_for_each_entry(root, &acpi_pci_roots, node) {
+ driver->add(root);
+ n++;
+ }
+ mutex_unlock(&acpi_pci_root_lock);
return n;
}
-
EXPORT_SYMBOL(acpi_pci_register_driver);
void acpi_pci_unregister_driver(struct acpi_pci_driver *driver)
{
struct acpi_pci_root *root;
+ mutex_lock(&acpi_pci_root_lock);
list_del(&driver->node);
-
- if (!driver->remove)
- return;
-
- list_for_each_entry(root, &acpi_pci_roots, node)
- driver->remove(root);
+ if (driver->remove)
+ list_for_each_entry(root, &acpi_pci_roots, node)
+ driver->remove(root);
+ mutex_unlock(&acpi_pci_root_lock);
}
-
EXPORT_SYMBOL(acpi_pci_unregister_driver);
acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus)
{
struct acpi_pci_root *root;
-
+ struct acpi_handle *handle = NULL;
+
list_for_each_entry(root, &acpi_pci_roots, node)
if ((root->segment == (u16) seg) &&
- (root->secondary.start == (u16) bus))
- return root->device->handle;
- return NULL;
-}
+ (root->secondary.start == (u16) bus)) {
+ handle = root->device->handle;
+ break;
+ }
+ return handle;
+}
EXPORT_SYMBOL_GPL(acpi_get_pci_rootbridge_handle);
/**
@@ -459,7 +460,7 @@ static int __devinit acpi_pci_root_add(struct acpi_device *device)
if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
printk(KERN_ERR PREFIX "can't evaluate _SEG\n");
result = -ENODEV;
- goto end;
+ goto out_free;
}
/* Check _CRS first, then _BBN. If no _BBN, default to zero. */
@@ -484,7 +485,7 @@ static int __devinit acpi_pci_root_add(struct acpi_device *device)
else {
printk(KERN_ERR PREFIX "can't evaluate _BBN\n");
result = -ENODEV;
- goto end;
+ goto out_free;
}
}
@@ -508,7 +509,7 @@ static int __devinit acpi_pci_root_add(struct acpi_device *device)
* TBD: Need PCI interface for enumeration/configuration of roots.
*/
- /* TBD: Locking */
+ mutex_lock(&acpi_pci_root_lock);
list_add_tail(&root->node, &acpi_pci_roots);
printk(KERN_INFO PREFIX "%s [%s] (domain %04x %pR)\n",
@@ -528,7 +529,7 @@ static int __devinit acpi_pci_root_add(struct acpi_device *device)
"Bus %04x:%02x not present in PCI namespace\n",
root->segment, (unsigned int)root->secondary.start);
result = -ENODEV;
- goto end;
+ goto out_del_root;
}
/*
@@ -538,7 +539,7 @@ static int __devinit acpi_pci_root_add(struct acpi_device *device)
*/
result = acpi_pci_bind_root(device);
if (result)
- goto end;
+ goto out_del_root;
/*
* PCI Routing Table
@@ -621,11 +622,14 @@ static int __devinit acpi_pci_root_add(struct acpi_device *device)
if (device->wakeup.flags.run_wake)
device_set_run_wake(root->bus->bridge, true);
+ mutex_unlock(&acpi_pci_root_lock);
+
return 0;
-end:
- if (!list_empty(&root->node))
- list_del(&root->node);
+out_del_root:
+ list_del(&root->node);
+ mutex_unlock(&acpi_pci_root_lock);
+out_free:
kfree(root);
return result;
}
@@ -635,11 +639,14 @@ static int acpi_pci_root_start(struct acpi_device *device)
struct acpi_pci_root *root = acpi_driver_data(device);
struct acpi_pci_driver *driver;
+ mutex_lock(&acpi_pci_root_lock);
list_for_each_entry(driver, &acpi_pci_drivers, node)
if (driver->add)
driver->add(root);
pci_bus_add_devices(root->bus);
+ mutex_unlock(&acpi_pci_root_lock);
+
return 0;
}
@@ -650,6 +657,8 @@ static int acpi_pci_root_remove(struct acpi_device *device, int type)
struct acpi_pci_root *root = acpi_driver_data(device);
struct acpi_pci_driver *driver;
+ mutex_lock(&acpi_pci_root_lock);
+
/* that root bus could be removed already */
if (!pci_find_bus(root->segment, root->secondary.start)) {
dev_printk(KERN_DEBUG, &device->dev,
@@ -677,6 +686,7 @@ static int acpi_pci_root_remove(struct acpi_device *device, int type)
out:
list_del(&root->node);
+ mutex_unlock(&acpi_pci_root_lock);
kfree(root);
return 0;
--
1.7.7
--
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