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authorJeff Dike <jdike@addtoit.com>2007-02-10 01:44:04 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-11 10:51:22 -0800
commitc862fc32a3ee4319c652f4ff39462d030120c380 (patch)
treed8a79fe0e26d449048f310531deec2d83835b386 /arch
parentf9795220521e0575dfd4ed0737d3a7848264662c (diff)
[PATCH] uml: network driver locking and code cleanup
Add some missing locking to walks of the transports and opened lists. Delete some dead code. Comment the lack of some locking. 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>
Diffstat (limited to 'arch')
-rw-r--r--arch/um/drivers/net_kern.c42
1 files changed, 18 insertions, 24 deletions
diff --git a/arch/um/drivers/net_kern.c b/arch/um/drivers/net_kern.c
index c1838645ae2..04e31f86c10 100644
--- a/arch/um/drivers/net_kern.c
+++ b/arch/um/drivers/net_kern.c
@@ -502,7 +502,7 @@ 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);
+static LIST_HEAD(eth_cmd_line);
static int check_transport(struct transport *transport, char *eth, int n,
void **init_out, char **mac_out)
@@ -563,7 +563,9 @@ static int eth_setup_common(char *str, int index)
struct transport *transport;
void *init;
char *mac = NULL;
+ int found = 0;
+ spin_lock(&transports_lock);
list_for_each(ele, &transports){
transport = list_entry(ele, struct transport, list);
if(!check_transport(transport, str, index, &init, &mac))
@@ -572,9 +574,12 @@ static int eth_setup_common(char *str, int index)
eth_configure(index, init, mac, transport);
kfree(init);
}
- return 1;
+ found = 1;
+ break;
}
- return 0;
+
+ spin_unlock(&transports_lock);
+ return found;
}
static int eth_setup(char *str)
@@ -610,24 +615,6 @@ __uml_help(eth_setup,
" Configure a network device.\n\n"
);
-#if 0
-static int eth_init(void)
-{
- struct list_head *ele, *next;
- struct eth_init *eth;
-
- list_for_each_safe(ele, next, &eth_cmd_line){
- eth = list_entry(ele, struct eth_init, list);
-
- if(eth_setup_common(eth->init, eth->index))
- list_del(&eth->list);
- }
-
- return(1);
-}
-__initcall(eth_init);
-#endif
-
static int net_config(char *str, char **error_out)
{
int n, err;
@@ -729,6 +716,7 @@ static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
return NOTIFY_DONE;
}
+/* uml_net_init shouldn't be called twice on two CPUs at the same time */
struct notifier_block uml_inetaddr_notifier = {
.notifier_call = uml_inetaddr_event,
};
@@ -747,18 +735,21 @@ static int uml_net_init(void)
* didn't get a chance to run for them. This fakes it so that
* addresses which have already been set up get handled properly.
*/
+ spin_lock(&opened_lock);
list_for_each(ele, &opened){
lp = list_entry(ele, struct uml_net_private, list);
ip = lp->dev->ip_ptr;
- if(ip == NULL) continue;
+ if(ip == NULL)
+ continue;
in = ip->ifa_list;
while(in != NULL){
uml_inetaddr_event(NULL, NETDEV_UP, in);
in = in->ifa_next;
}
}
+ spin_unlock(&opened_lock);
- return(0);
+ return 0;
}
__initcall(uml_net_init);
@@ -768,13 +759,16 @@ static void close_devices(void)
struct list_head *ele;
struct uml_net_private *lp;
+ spin_lock(&opened_lock);
list_for_each(ele, &opened){
lp = list_entry(ele, struct uml_net_private, list);
free_irq(lp->dev->irq, lp->dev);
if((lp->close != NULL) && (lp->fd >= 0))
(*lp->close)(lp->fd, &lp->user);
- if(lp->remove != NULL) (*lp->remove)(&lp->user);
+ if(lp->remove != NULL)
+ (*lp->remove)(&lp->user);
}
+ spin_unlock(&opened_lock);
}
__uml_exitcall(close_devices);