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Date: Mon, 11 Feb 2008 12:42:51 +0000
From: Jarek Poplawski <jarkao2@...il.com>
To: David Miller <davem@...emloft.net>
Cc: Jann Traschewski <jann@....de>,
Bernard Pidoux F6BVP <f6bvp@...e.fr>,
Ralf Baechle DL5RB <ralf@...ux-mips.org>,
netdev@...r.kernel.org
Subject: [PATCH][AX25] ax25_route: make ax25_route_lock BH safe
Subject: [AX25] ax25_route: make ax25_route_lock BH safe
> =================================
> [ INFO: inconsistent lock state ]
> 2.6.24-dg8ngn-p02 #1
> ---------------------------------
> inconsistent {softirq-on-W} -> {in-softirq-R} usage.
> linuxnet/3046 [HC0[0]:SC1[2]:HE1:SE0] takes:
> (ax25_route_lock){--.+}, at: [<f8a0cfb7>] ax25_get_route+0x18/0xb7 [ax25]
> {softirq-on-W} state was registered at:
...
This lockdep report shows that ax25_route_lock is taken for reading in
softirq context, and for writing in process context with BHs enabled.
So, to make this safe, all write_locks in ax25_route.c are changed to
_bh versions.
Reported-by: Jann Traschewski <jann@....de>,
Signed-off-by: Jarek Poplawski <jarkao2@...il.com>
---
diff -Nurp 2.6.24-mm1-/net/ax25/ax25_route.c 2.6.24-mm1+/net/ax25/ax25_route.c
--- 2.6.24-mm1-/net/ax25/ax25_route.c 2008-02-05 07:45:38.000000000 +0000
+++ 2.6.24-mm1+/net/ax25/ax25_route.c 2008-02-11 11:58:47.000000000 +0000
@@ -45,7 +45,7 @@ void ax25_rt_device_down(struct net_devi
{
ax25_route *s, *t, *ax25_rt;
- write_lock(&ax25_route_lock);
+ write_lock_bh(&ax25_route_lock);
ax25_rt = ax25_route_list;
while (ax25_rt != NULL) {
s = ax25_rt;
@@ -68,7 +68,7 @@ void ax25_rt_device_down(struct net_devi
}
}
}
- write_unlock(&ax25_route_lock);
+ write_unlock_bh(&ax25_route_lock);
}
static int __must_check ax25_rt_add(struct ax25_routes_struct *route)
@@ -82,7 +82,7 @@ static int __must_check ax25_rt_add(stru
if (route->digi_count > AX25_MAX_DIGIS)
return -EINVAL;
- write_lock(&ax25_route_lock);
+ write_lock_bh(&ax25_route_lock);
ax25_rt = ax25_route_list;
while (ax25_rt != NULL) {
@@ -92,7 +92,7 @@ static int __must_check ax25_rt_add(stru
ax25_rt->digipeat = NULL;
if (route->digi_count != 0) {
if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
- write_unlock(&ax25_route_lock);
+ write_unlock_bh(&ax25_route_lock);
return -ENOMEM;
}
ax25_rt->digipeat->lastrepeat = -1;
@@ -102,14 +102,14 @@ static int __must_check ax25_rt_add(stru
ax25_rt->digipeat->calls[i] = route->digi_addr[i];
}
}
- write_unlock(&ax25_route_lock);
+ write_unlock_bh(&ax25_route_lock);
return 0;
}
ax25_rt = ax25_rt->next;
}
if ((ax25_rt = kmalloc(sizeof(ax25_route), GFP_ATOMIC)) == NULL) {
- write_unlock(&ax25_route_lock);
+ write_unlock_bh(&ax25_route_lock);
return -ENOMEM;
}
@@ -120,7 +120,7 @@ static int __must_check ax25_rt_add(stru
ax25_rt->ip_mode = ' ';
if (route->digi_count != 0) {
if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
- write_unlock(&ax25_route_lock);
+ write_unlock_bh(&ax25_route_lock);
kfree(ax25_rt);
return -ENOMEM;
}
@@ -133,7 +133,7 @@ static int __must_check ax25_rt_add(stru
}
ax25_rt->next = ax25_route_list;
ax25_route_list = ax25_rt;
- write_unlock(&ax25_route_lock);
+ write_unlock_bh(&ax25_route_lock);
return 0;
}
@@ -152,7 +152,7 @@ static int ax25_rt_del(struct ax25_route
if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL)
return -EINVAL;
- write_lock(&ax25_route_lock);
+ write_lock_bh(&ax25_route_lock);
ax25_rt = ax25_route_list;
while (ax25_rt != NULL) {
@@ -174,7 +174,7 @@ static int ax25_rt_del(struct ax25_route
}
}
}
- write_unlock(&ax25_route_lock);
+ write_unlock_bh(&ax25_route_lock);
return 0;
}
@@ -188,7 +188,7 @@ static int ax25_rt_opt(struct ax25_route
if ((ax25_dev = ax25_addr_ax25dev(&rt_option->port_addr)) == NULL)
return -EINVAL;
- write_lock(&ax25_route_lock);
+ write_lock_bh(&ax25_route_lock);
ax25_rt = ax25_route_list;
while (ax25_rt != NULL) {
@@ -216,7 +216,7 @@ static int ax25_rt_opt(struct ax25_route
}
out:
- write_unlock(&ax25_route_lock);
+ write_unlock_bh(&ax25_route_lock);
return err;
}
@@ -492,7 +492,7 @@ void __exit ax25_rt_free(void)
{
ax25_route *s, *ax25_rt = ax25_route_list;
- write_lock(&ax25_route_lock);
+ write_lock_bh(&ax25_route_lock);
while (ax25_rt != NULL) {
s = ax25_rt;
ax25_rt = ax25_rt->next;
@@ -500,5 +500,5 @@ void __exit ax25_rt_free(void)
kfree(s->digipeat);
kfree(s);
}
- write_unlock(&ax25_route_lock);
+ write_unlock_bh(&ax25_route_lock);
}
--
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