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| author | Eric Dumazet <edumazet@google.com> | 2024-12-15 17:56:28 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-02-08 10:01:10 +0100 |
| commit | 5151115b590bd5a5bf2b42601ff763bb74ac1b10 (patch) | |
| tree | 7a52ac25aa7d70f288a9c325ca97c7c8a3a85c6d /net/ipv4 | |
| parent | bb616f95671b6dc67dbf3ca886bb871f8179ba20 (diff) | |
| download | linux-5151115b590bd5a5bf2b42601ff763bb74ac1b10.tar.gz linux-5151115b590bd5a5bf2b42601ff763bb74ac1b10.tar.bz2 linux-5151115b590bd5a5bf2b42601ff763bb74ac1b10.zip | |
inetpeer: update inetpeer timestamp in inet_getpeer()
[ Upstream commit 50b362f21d6c10b0f7939c1482c6a1b43da82f1a ]
inet_putpeer() will be removed in the following patch,
because we will no longer use refcounts.
Update inetpeer timestamp (p->dtime) at lookup time.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20241215175629.1248773-4-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Stable-dep-of: a853c609504e ("inetpeer: do not get a refcount in inet_getpeer()")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/inetpeer.c | 12 |
1 files changed, 4 insertions, 8 deletions
diff --git a/net/ipv4/inetpeer.c b/net/ipv4/inetpeer.c index bc79cc9d13eb..28c3ae5bc4a0 100644 --- a/net/ipv4/inetpeer.c +++ b/net/ipv4/inetpeer.c @@ -95,6 +95,7 @@ static struct inet_peer *lookup(const struct inetpeer_addr *daddr, { struct rb_node **pp, *parent, *next; struct inet_peer *p; + u32 now; pp = &base->rb_root.rb_node; parent = NULL; @@ -110,6 +111,9 @@ static struct inet_peer *lookup(const struct inetpeer_addr *daddr, if (cmp == 0) { if (!refcount_inc_not_zero(&p->refcnt)) break; + now = jiffies; + if (READ_ONCE(p->dtime) != now) + WRITE_ONCE(p->dtime, now); return p; } if (gc_stack) { @@ -150,9 +154,6 @@ static void inet_peer_gc(struct inet_peer_base *base, for (i = 0; i < gc_cnt; i++) { p = gc_stack[i]; - /* The READ_ONCE() pairs with the WRITE_ONCE() - * in inet_putpeer() - */ delta = (__u32)jiffies - READ_ONCE(p->dtime); if (delta < ttl || !refcount_dec_if_one(&p->refcnt)) @@ -224,11 +225,6 @@ EXPORT_SYMBOL_GPL(inet_getpeer); void inet_putpeer(struct inet_peer *p) { - /* The WRITE_ONCE() pairs with itself (we run lockless) - * and the READ_ONCE() in inet_peer_gc() - */ - WRITE_ONCE(p->dtime, (__u32)jiffies); - if (refcount_dec_and_test(&p->refcnt)) kfree_rcu(p, rcu); } |