From: Jinjie Ruan <ruanjinjie@huawei.com>
To: <viro@zeniv.linux.org.uk>, <brauner@kernel.org>, <jack@suse.cz>,
<bcrl@kvack.org>, <tytso@mit.edu>, <adilger.kernel@dilger.ca>,
<libaokun@linux.alibaba.com>, <ojaswin@linux.ibm.com>,
<ritesh.list@gmail.com>, <yi.zhang@huawei.com>,
<sforshee@kernel.org>, <pmladek@suse.com>, <rostedt@goodmis.org>,
<andriy.shevchenko@linux.intel.com>, <linux@rasmusvillemoes.dk>,
<senozhatsky@chromium.org>, <akpm@linux-foundation.org>,
<davem@davemloft.net>, <edumazet@google.com>, <kuba@kernel.org>,
<pabeni@redhat.com>, <horms@kernel.org>, <kuniyu@google.com>,
<willemb@google.com>, <jhs@mojatatu.com>, <jiri@resnulli.us>,
<kees@kernel.org>, <cyphar@cyphar.com>, <tglx@kernel.org>,
<ruanjinjie@huawei.com>, <sdf@fomichev.me>, <nb@tipi-net.de>,
<liuhangbin@gmail.com>, <da-x@monatomic.org>, <jeff@garzik.org>,
<linux-fsdevel@vger.kernel.org>, <linux-aio@kvack.org>,
<linux-kernel@vger.kernel.org>, <linux-ext4@vger.kernel.org>,
<netdev@vger.kernel.org>
Subject: [PATCH v2 12/12] 8021q: publish vlan_devices_arrays entries with acquire/release
Date: Tue, 1 Sep 2026 10:42:34 +0800 [thread overview]
Message-ID: <20260901024234.135119-13-ruanjinjie@huawei.com> (raw)
In-Reply-To: <20260901024234.135119-1-ruanjinjie@huawei.com>
Replace the smp_wmb()/smp_rmb() barrier pair with
smp_store_release()/smp_load_acquire() on
vg->vlan_devices_arrays[pidx][vidx].
vlan_group_prealloc_vid() publishes the array pointer via release;
__vlan_group_get_device() acquires it before accessing the array,
ensuring the allocated entries are visible.
No functional change intended.
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: Simon Horman <horms@kernel.org>
Cc: Nicolai Buchwitz <nb@tipi-net.de>
Cc: Stanislav Fomichev <sdf@fomichev.me>
Cc: Hangbin Liu <liuhangbin@gmail.com>
Cc: Kuniyuki Iwashima <kuniyu@google.com>
Assisted-by: DeepSeek:DeepSeek-V3
Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
---
net/8021q/vlan.c | 6 ++----
net/8021q/vlan.h | 8 +++-----
2 files changed, 5 insertions(+), 9 deletions(-)
diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c
index 2d2efb877975..e34ada0cceac 100644
--- a/net/8021q/vlan.c
+++ b/net/8021q/vlan.c
@@ -70,10 +70,8 @@ static int vlan_group_prealloc_vid(struct vlan_group *vg,
if (array == NULL)
return -ENOBUFS;
- /* paired with smp_rmb() in __vlan_group_get_device() */
- smp_wmb();
-
- vg->vlan_devices_arrays[pidx][vidx] = array;
+ /* paired with smp_load_acquire() in __vlan_group_get_device() */
+ smp_store_release(&vg->vlan_devices_arrays[pidx][vidx], array);
return 0;
}
diff --git a/net/8021q/vlan.h b/net/8021q/vlan.h
index 8030d616cb16..ee22637aa7ba 100644
--- a/net/8021q/vlan.h
+++ b/net/8021q/vlan.h
@@ -56,11 +56,9 @@ static inline struct net_device *__vlan_group_get_device(struct vlan_group *vg,
{
struct net_device **array;
- array = vg->vlan_devices_arrays[pidx]
- [vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
-
- /* paired with smp_wmb() in vlan_group_prealloc_vid() */
- smp_rmb();
+ /* Pairs with smp_store_release() in vlan_group_prealloc_vid() */
+ array = smp_load_acquire(&vg->vlan_devices_arrays[pidx]
+ [vlan_id / VLAN_GROUP_ARRAY_PART_LEN]);
return array ? rcu_dereference_raw(array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN]) : NULL;
}
--
2.34.1
next prev parent reply other threads:[~2026-09-01 2:42 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-01 2:42 [PATCH v2 00/12] Convert barrier pairs to acquire/release for better performance Jinjie Ruan
2026-09-01 2:42 ` [PATCH v2 01/12] user_namespace: Use acquire/release for nr_extents synchronization Jinjie Ruan
2026-09-01 2:42 ` [PATCH v2 02/12] lib/vsprintf: Use acquire/release for ptr_key publication Jinjie Ruan
2026-09-01 2:42 ` [PATCH v2 03/12] fs: aio: Use acquire/release for ring->tail publication Jinjie Ruan
2026-09-01 2:42 ` [PATCH v2 04/12] fs: Use acquire/release for fdtable resize synchronization Jinjie Ruan
2026-09-01 2:42 ` [PATCH v2 05/12] pidfs: Use test_bit_acquire() for attr flag tests Jinjie Ruan
2026-09-01 2:42 ` [PATCH v2 06/12] super: Use acquire for SB_BORN check in super_cache_count() Jinjie Ruan
2026-09-01 2:42 ` [PATCH v2 07/12] ext4: Fix out-of-bounds read in ext4_get_group_info() Jinjie Ruan
2026-09-01 6:44 ` Zhang Yi
2026-09-01 13:55 ` Jan Kara
2026-09-01 2:42 ` [PATCH v2 08/12] ext4: Convert group-count barrier protocol to acquire/release Jinjie Ruan
2026-09-01 2:42 ` [PATCH v2 09/12] soreuseport: publish num_socks with acquire/release Jinjie Ruan
2026-09-01 2:42 ` [PATCH v2 10/12] net: sched: act_gact: use acquire/release for tcfg_ptype Jinjie Ruan
2026-09-01 2:42 ` [PATCH v2 11/12] 8021q: Fix data race when publishing vlan net_device pointers Jinjie Ruan
2026-09-01 14:58 ` Jakub Kicinski
2026-09-02 6:46 ` Jinjie Ruan
2026-09-01 2:42 ` Jinjie Ruan [this message]
2026-09-01 3:06 ` [PATCH v2 00/12] Convert barrier pairs to acquire/release for better performance Kuniyuki Iwashima
2026-09-01 3:15 ` Jinjie Ruan
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