netdev - [PATCH net-next 2/3] bonding: no longer use RTNL in bonding_show

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Date: Mon,  8 Apr 2024 19:04:36 +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: Jay Vosburgh <j.vosburgh@...il.com>, Andy Gospodarek <andy@...yhouse.net>, netdev@...r.kernel.org, 
	eric.dumazet@...il.com, Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next 2/3] bonding: no longer use RTNL in bonding_show_slaves()

Slave devices are already RCU protected, simply
switch to bond_for_each_slave_rcu(),

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 drivers/net/bonding/bond_sysfs.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index 9132033f85fb0e33093e97c55f885a997c95cb4a..75ee7ca369034ef6fa58fc9399b566dd7044fedc 100644
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -170,10 +170,9 @@ static ssize_t bonding_show_slaves(struct device *d,
 	struct slave *slave;
 	int res = 0;
 
-	if (!rtnl_trylock())
-		return restart_syscall();
+	rcu_read_lock();
 
-	bond_for_each_slave(bond, slave, iter) {
+	bond_for_each_slave_rcu(bond, slave, iter) {
 		if (res > (PAGE_SIZE - IFNAMSIZ)) {
 			/* not enough space for another interface name */
 			if ((PAGE_SIZE - res) > 10)
@@ -184,7 +183,7 @@ static ssize_t bonding_show_slaves(struct device *d,
 		res += sysfs_emit_at(buf, res, "%s ", slave->dev->name);
 	}
 
-	rtnl_unlock();
+	rcu_read_unlock();
 
 	if (res)
 		buf[res-1] = '\n'; /* eat the leftover space */
-- 
2.44.0.478.gd926399ef9-goog