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[PATCH] uml: add locking to network transport registration

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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>
This commit is contained in:
Jeff Dike
2007-02-10 01:43:56 -08:00
committed by Linus Torvalds
parent 190c3e4563
commit d3b7f69de2
2 changed files with 9 additions and 8 deletions
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9
arch/um/drivers/net_kern.c
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@@ -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);