The patch titled
uml: add locking to network transport registration
has been removed from the -mm tree. Its filename was
uml-add-locking-to-network-transport-registration.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: uml: add locking to network transport registration
From: Jeff Dike <jdike@xxxxxxxxxxx>
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@xxxxxxxxxxx>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@xxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/um/drivers/net_kern.c | 9 +++++----
arch/um/include/net_kern.h | 8 ++++----
2 files changed, 9 insertions(+), 8 deletions(-)
diff -puN arch/um/drivers/net_kern.c~uml-add-locking-to-network-transport-registration arch/um/drivers/net_kern.c
--- a/arch/um/drivers/net_kern.c~uml-add-locking-to-network-transport-registration
+++ a/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
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, ð_cmd_line){
eth = list_entry(ele, struct eth_init, list);
diff -puN arch/um/include/net_kern.h~uml-add-locking-to-network-transport-registration arch/um/include/net_kern.h
--- a/arch/um/include/net_kern.h~uml-add-locking-to-network-transport-registration
+++ a/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);
_
Patches currently in -mm which might be from jdike@xxxxxxxxxxx are
origin.patch
uml-fix-prototypes.patch
dynamic-kernel-command-line-common.patch
dynamic-kernel-command-line-um.patch
-
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