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Date: Mon, 29 Nov 2010 08:43:02 +0100
From: Eric Dumazet <eric.dumazet@...il.com>
To: David Miller <davem@...emloft.net>
Cc: netdev <netdev@...r.kernel.org>, Tom Herbert <therbert@...gle.com>
Subject: [PATCH net-next-2.6] xps: add __rcu annotations
Avoid sparse warnings : add __rcu annotations and use
rcu_dereference_protected() where necessary.
Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
Cc: Tom Herbert <therbert@...gle.com>
---
include/linux/netdevice.h | 4 ++--
net/core/net-sysfs.c | 24 +++++++++++++++---------
2 files changed, 17 insertions(+), 11 deletions(-)
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 9ae4544..4b0c7f3 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -622,7 +622,7 @@ struct xps_map {
*/
struct xps_dev_maps {
struct rcu_head rcu;
- struct xps_map *cpu_map[0];
+ struct xps_map __rcu *cpu_map[0];
};
#define XPS_DEV_MAPS_SIZE (sizeof(struct xps_dev_maps) + \
(nr_cpu_ids * sizeof(struct xps_map *)))
@@ -1049,7 +1049,7 @@ struct net_device {
spinlock_t tx_global_lock;
#ifdef CONFIG_XPS
- struct xps_dev_maps *xps_maps;
+ struct xps_dev_maps __rcu *xps_maps;
#endif
/* These may be needed for future network-power-down code. */
diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index 99c1129..3ba2103 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -899,6 +899,8 @@ static void xps_dev_maps_release(struct rcu_head *rcu)
}
static DEFINE_MUTEX(xps_map_mutex);
+#define xmap_dereference(P) \
+ rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
static ssize_t store_xps_map(struct netdev_queue *queue,
struct netdev_queue_attribute *attribute,
@@ -935,11 +937,12 @@ static ssize_t store_xps_map(struct netdev_queue *queue,
mutex_lock(&xps_map_mutex);
- dev_maps = dev->xps_maps;
+ dev_maps = xmap_dereference(dev->xps_maps);
for_each_possible_cpu(cpu) {
- new_map = map = dev_maps ? dev_maps->cpu_map[cpu] : NULL;
-
+ map = dev_maps ?
+ xmap_dereference(dev_maps->cpu_map[cpu]) : NULL;
+ new_map = map;
if (map) {
for (pos = 0; pos < map->len; pos++)
if (map->queues[pos] == index)
@@ -974,13 +977,14 @@ static ssize_t store_xps_map(struct netdev_queue *queue,
else
new_map = NULL;
}
- new_dev_maps->cpu_map[cpu] = new_map;
+ RCU_INIT_POINTER(new_dev_maps->cpu_map[cpu], new_map);
}
/* Cleanup old maps */
for_each_possible_cpu(cpu) {
- map = dev_maps ? dev_maps->cpu_map[cpu] : NULL;
- if (map && new_dev_maps->cpu_map[cpu] != map)
+ map = dev_maps ?
+ xmap_dereference(dev_maps->cpu_map[cpu]) : NULL;
+ if (map && xmap_dereference(new_dev_maps->cpu_map[cpu]) != map)
call_rcu(&map->rcu, xps_map_release);
if (new_dev_maps->cpu_map[cpu])
nonempty = 1;
@@ -1006,7 +1010,9 @@ error:
if (new_dev_maps)
for_each_possible_cpu(i)
- kfree(new_dev_maps->cpu_map[i]);
+ kfree(rcu_dereference_protected(
+ new_dev_maps->cpu_map[i],
+ 1));
kfree(new_dev_maps);
free_cpumask_var(mask);
return -ENOMEM;
@@ -1032,11 +1038,11 @@ static void netdev_queue_release(struct kobject *kobj)
index = get_netdev_queue_index(queue);
mutex_lock(&xps_map_mutex);
- dev_maps = dev->xps_maps;
+ dev_maps = xmap_dereference(dev->xps_maps);
if (dev_maps) {
for_each_possible_cpu(i) {
- map = dev_maps->cpu_map[i];
+ map = xmap_dereference(dev_maps->cpu_map[i]);
if (!map)
continue;
--
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