[NET]: Fix running without sysfs
When sysfs support is compiled out the kernel still keeps and maintains
the kobject tree. So it is not safe to skip our kobject reference counting or
to avoid becoming members of the kobject tree. It is safe to not add
the networking specific sysfs attributes.
This patch removes the sysfs special cases from net/core/dev.c
renames functions from netdev_sysfs_xxxx to netdev_kobject_xxxx
and always compiles in net-sysfs.c
net-sysfs.c is modified with a CONFIG_SYSFS guard around the parts
that are actually sysfs specific.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/Makefile b/net/core/Makefile
index ea9b3f3..b1332f6 100644
--- a/net/core/Makefile
+++ b/net/core/Makefile
@@ -11,7 +11,7 @@
neighbour.o rtnetlink.o utils.o link_watch.o filter.o
obj-$(CONFIG_XFRM) += flow.o
-obj-$(CONFIG_SYSFS) += net-sysfs.o
+obj-y += net-sysfs.o
obj-$(CONFIG_NET_PKTGEN) += pktgen.o
obj-$(CONFIG_NETPOLL) += netpoll.o
obj-$(CONFIG_NET_DMA) += user_dma.o
diff --git a/net/core/dev.c b/net/core/dev.c
index 080d32c..3923d51 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -249,15 +249,9 @@
DEFINE_PER_CPU(struct softnet_data, softnet_data);
-#ifdef CONFIG_SYSFS
-extern int netdev_sysfs_init(void);
-extern int netdev_register_sysfs(struct net_device *);
-extern void netdev_unregister_sysfs(struct net_device *);
-#else
-#define netdev_sysfs_init() (0)
-#define netdev_register_sysfs(dev) (0)
-#define netdev_unregister_sysfs(dev) do { } while(0)
-#endif
+extern int netdev_kobject_init(void);
+extern int netdev_register_kobject(struct net_device *);
+extern void netdev_unregister_kobject(struct net_device *);
#ifdef CONFIG_DEBUG_LOCK_ALLOC
/*
@@ -3575,7 +3569,7 @@
if (!dev->rebuild_header)
dev->rebuild_header = default_rebuild_header;
- ret = netdev_register_sysfs(dev);
+ ret = netdev_register_kobject(dev);
if (ret)
goto err_uninit;
dev->reg_state = NETREG_REGISTERED;
@@ -3838,7 +3832,6 @@
*/
void free_netdev(struct net_device *dev)
{
-#ifdef CONFIG_SYSFS
/* Compatibility with error handling in drivers */
if (dev->reg_state == NETREG_UNINITIALIZED) {
kfree((char *)dev - dev->padded);
@@ -3850,9 +3843,6 @@
/* will free via device release */
put_device(&dev->dev);
-#else
- kfree((char *)dev - dev->padded);
-#endif
}
/* Synchronize with packet receive processing. */
@@ -3921,8 +3911,8 @@
/* Notifier chain MUST detach us from master device. */
BUG_TRAP(!dev->master);
- /* Remove entries from sysfs */
- netdev_unregister_sysfs(dev);
+ /* Remove entries from kobject tree */
+ netdev_unregister_kobject(dev);
/* Finish processing unregister after unlock */
net_set_todo(dev);
@@ -4053,9 +4043,9 @@
dev->iflink = dev->ifindex;
}
- /* Fixup sysfs */
+ /* Fixup kobjects */
err = device_rename(&dev->dev, dev->name);
- BUG_ON(err);
+ WARN_ON(err);
/* Add the device back in the hashes */
list_netdevice(dev);
@@ -4358,7 +4348,7 @@
if (dev_proc_init())
goto out;
- if (netdev_sysfs_init())
+ if (netdev_kobject_init())
goto out;
INIT_LIST_HEAD(&ptype_all);
diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index 79159db..909a03d 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -18,6 +18,7 @@
#include <linux/wireless.h>
#include <net/iw_handler.h>
+#ifdef CONFIG_SYSFS
static const char fmt_hex[] = "%#x\n";
static const char fmt_long_hex[] = "%#lx\n";
static const char fmt_dec[] = "%d\n";
@@ -392,6 +393,8 @@
};
#endif
+#endif /* CONFIG_SYSFS */
+
#ifdef CONFIG_HOTPLUG
static int netdev_uevent(struct device *d, char **envp,
int num_envp, char *buf, int size)
@@ -435,7 +438,9 @@
static struct class net_class = {
.name = "net",
.dev_release = netdev_release,
+#ifdef CONFIG_SYSFS
.dev_attrs = net_class_attributes,
+#endif /* CONFIG_SYSFS */
#ifdef CONFIG_HOTPLUG
.dev_uevent = netdev_uevent,
#endif
@@ -444,7 +449,7 @@
/* Delete sysfs entries but hold kobject reference until after all
* netdev references are gone.
*/
-void netdev_unregister_sysfs(struct net_device * net)
+void netdev_unregister_kobject(struct net_device * net)
{
struct device *dev = &(net->dev);
@@ -453,7 +458,7 @@
}
/* Create sysfs entries for network device. */
-int netdev_register_sysfs(struct net_device *net)
+int netdev_register_kobject(struct net_device *net)
{
struct device *dev = &(net->dev);
struct attribute_group **groups = net->sysfs_groups;
@@ -466,6 +471,7 @@
BUILD_BUG_ON(BUS_ID_SIZE < IFNAMSIZ);
strlcpy(dev->bus_id, net->name, BUS_ID_SIZE);
+#ifdef CONFIG_SYSFS
if (net->get_stats)
*groups++ = &netstat_group;
@@ -473,11 +479,12 @@
if (net->wireless_handlers && net->wireless_handlers->get_wireless_stats)
*groups++ = &wireless_group;
#endif
+#endif /* CONFIG_SYSFS */
return device_add(dev);
}
-int netdev_sysfs_init(void)
+int netdev_kobject_init(void)
{
return class_register(&net_class);
}