[PATCH] uml: add locking to network transport registration

The registration of host network transports needed some locking.  The
transport list itself is locked, but calls to the registration routines are
not.  This is compensated for by checking that a transport structure is not
yet on any list.

I also took the opportunity to const all fields in the transport structure
except the list, which obviously can be modified.

Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 9 insertions, 8 deletions

diff --git a/arch/um/drivers/net_kern.c b/arch/um/drivers/net_kern.c
index 07e839e387db..b10154cc46b6 100644
--- a/arch/um/drivers/net_kern.c
+++ b/arch/um/drivers/net_kern.c
@@ -498,10 +498,8 @@ struct eth_init {
         int index;
 };
 
-/* Filled in at boot time.  Will need locking if the transports become
- * modular.
- */
-struct list_head transports = LIST_HEAD_INIT(transports);
+static DEFINE_SPINLOCK(transports_lock);
+static LIST_HEAD(transports);
 
 /* Filled in during early boot */
 struct list_head eth_cmd_line = LIST_HEAD_INIT(eth_cmd_line);
@@ -540,7 +538,10 @@ void register_transport(struct transport *new)
         char *mac = NULL;
         int match;
 
+        spin_lock(&transports_lock);
+        BUG_ON(!list_empty(&new->list));
         list_add(&new->list, &transports);
+        spin_unlock(&transports_lock);
 
         list_for_each_safe(ele, next, &eth_cmd_line){
                 eth = list_entry(ele, struct eth_init, list);
diff --git a/arch/um/include/net_kern.h b/arch/um/include/net_kern.h
index 218f8b47fdcd..92f76d82a6ef 100644
--- a/arch/um/include/net_kern.h
+++ b/arch/um/include/net_kern.h
@@ -52,12 +52,12 @@ struct net_kern_info {
 
 struct transport {
         struct list_head list;
-        char *name;
-        int (*setup)(char *, char **, void *);
+        const char *name;
+        int (* const setup)(char *, char **, void *);
         const struct net_user_info *user;
         const struct net_kern_info *kern;
-        int private_size;
-        int setup_size;
+        const int private_size;
+        const int setup_size;
 };
 
 extern struct net_device *ether_init(int);