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Message-ID: <20240207142629.3456570-9-edumazet@google.com>
Date: Wed, 7 Feb 2024 14:26:24 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, eric.dumazet@...il.com,
Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next 08/13] net-sysfs: convert netstat_show() to RCU
dev_get_stats() can be called from RCU, there is no need
to acquire dev_base_lock.
Change dev_isalive() comment to reflect we no longer use
dev_base_lock from net/core/net-sysfs.c
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
net/core/net-sysfs.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index c5d164b8c6bfb53793f8422063c6281d6339b36e..946caefdd9599f631a73487e950305c978f8bc66 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -34,7 +34,7 @@ static const char fmt_dec[] = "%d\n";
static const char fmt_ulong[] = "%lu\n";
static const char fmt_u64[] = "%llu\n";
-/* Caller holds RTNL, RCU or dev_base_lock */
+/* Caller holds RTNL or RCU */
static inline int dev_isalive(const struct net_device *dev)
{
return READ_ONCE(dev->reg_state) <= NETREG_REGISTERED;
@@ -685,14 +685,14 @@ static ssize_t netstat_show(const struct device *d,
WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
offset % sizeof(u64) != 0);
- read_lock(&dev_base_lock);
+ rcu_read_lock();
if (dev_isalive(dev)) {
struct rtnl_link_stats64 temp;
const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
ret = sysfs_emit(buf, fmt_u64, *(u64 *)(((u8 *)stats) + offset));
}
- read_unlock(&dev_base_lock);
+ rcu_read_unlock();
return ret;
}
--
2.43.0.594.gd9cf4e227d-goog
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