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Message-Id: <20120103223326.791344797@clark.kroah.org>
Date: Tue, 03 Jan 2012 14:33:41 -0800
From: Greg KH <gregkh@...e.de>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
alan@...rguk.ukuu.org.uk,
Steffen Klassert <steffen.klassert@...unet.com>,
Timo Ter�s <timo.teras@....fi>,
"David S. Miller" <davem@...emloft.net>
Subject: [68/75] net: Add a flow_cache_flush_deferred function
3.1-stable review patch. If anyone has any objections, please let me know.
------------------
From: Steffen Klassert <steffen.klassert@...unet.com>
[ Upstream commit c0ed1c14a72ca9ebacd51fb94a8aca488b0d361e ]
flow_cach_flush() might sleep but can be called from
atomic context via the xfrm garbage collector. So add
a flow_cache_flush_deferred() function and use this if
the xfrm garbage colector is invoked from within the
packet path.
Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>
Acked-by: Timo Ter�s <timo.teras@....fi>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
include/net/flow.h | 1 +
net/core/flow.c | 12 ++++++++++++
net/xfrm/xfrm_policy.c | 18 ++++++++++++++----
3 files changed, 27 insertions(+), 4 deletions(-)
--- a/include/net/flow.h
+++ b/include/net/flow.h
@@ -207,6 +207,7 @@ extern struct flow_cache_object *flow_ca
u8 dir, flow_resolve_t resolver, void *ctx);
extern void flow_cache_flush(void);
+extern void flow_cache_flush_deferred(void);
extern atomic_t flow_cache_genid;
#endif
--- a/net/core/flow.c
+++ b/net/core/flow.c
@@ -358,6 +358,18 @@ void flow_cache_flush(void)
put_online_cpus();
}
+static void flow_cache_flush_task(struct work_struct *work)
+{
+ flow_cache_flush();
+}
+
+static DECLARE_WORK(flow_cache_flush_work, flow_cache_flush_task);
+
+void flow_cache_flush_deferred(void)
+{
+ schedule_work(&flow_cache_flush_work);
+}
+
static int __cpuinit flow_cache_cpu_prepare(struct flow_cache *fc, int cpu)
{
struct flow_cache_percpu *fcp = per_cpu_ptr(fc->percpu, cpu);
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -2276,8 +2276,6 @@ static void __xfrm_garbage_collect(struc
{
struct dst_entry *head, *next;
- flow_cache_flush();
-
spin_lock_bh(&xfrm_policy_sk_bundle_lock);
head = xfrm_policy_sk_bundles;
xfrm_policy_sk_bundles = NULL;
@@ -2290,6 +2288,18 @@ static void __xfrm_garbage_collect(struc
}
}
+static void xfrm_garbage_collect(struct net *net)
+{
+ flow_cache_flush();
+ __xfrm_garbage_collect(net);
+}
+
+static void xfrm_garbage_collect_deferred(struct net *net)
+{
+ flow_cache_flush_deferred();
+ __xfrm_garbage_collect(net);
+}
+
static void xfrm_init_pmtu(struct dst_entry *dst)
{
do {
@@ -2420,7 +2430,7 @@ int xfrm_policy_register_afinfo(struct x
if (likely(dst_ops->neigh_lookup == NULL))
dst_ops->neigh_lookup = xfrm_neigh_lookup;
if (likely(afinfo->garbage_collect == NULL))
- afinfo->garbage_collect = __xfrm_garbage_collect;
+ afinfo->garbage_collect = xfrm_garbage_collect_deferred;
xfrm_policy_afinfo[afinfo->family] = afinfo;
}
write_unlock_bh(&xfrm_policy_afinfo_lock);
@@ -2514,7 +2524,7 @@ static int xfrm_dev_event(struct notifie
switch (event) {
case NETDEV_DOWN:
- __xfrm_garbage_collect(dev_net(dev));
+ xfrm_garbage_collect(dev_net(dev));
}
return NOTIFY_DONE;
}
--
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