netdev - [PATCH net-next 2/3] net: netconsole: Eliminate redundant setting of enabled field

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Message-ID: <20240709144403.544099-3-leitao@debian.org>
Date: Tue,  9 Jul 2024 07:44:00 -0700
From: Breno Leitao <leitao@...ian.org>
To: davem@...emloft.net,
	edumazet@...gle.com,
	pabeni@...hat.com,
	Jakub Kicinski <kuba@...nel.org>
Cc: thepacketgeek@...il.com,
	riel@...riel.com,
	horms@...nel.org,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH net-next 2/3] net: netconsole: Eliminate redundant setting of enabled field

When disabling a netconsole target, enabled_store() is called with
enabled=false. Currently, this results in updating the nt->enabled
field twice:

1. Inside the if/else block, with the target_list_lock spinlock held
2. Later, without the target_list_lock

This patch eliminates the redundancy by setting the field only once,
improving efficiency and reducing potential race conditions.

Signed-off-by: Breno Leitao <leitao@...ian.org>
---
 drivers/net/netconsole.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c
index de0d89e4e4e2..5ef680cf994a 100644
--- a/drivers/net/netconsole.c
+++ b/drivers/net/netconsole.c
@@ -369,6 +369,7 @@ static ssize_t enabled_store(struct config_item *item,
 		if (err)
 			goto out_unlock;
 
+		nt->enabled = true;
 		pr_info("network logging started\n");
 	} else {	/* false */
 		/* We need to disable the netconsole before cleaning it up
@@ -381,8 +382,6 @@ static ssize_t enabled_store(struct config_item *item,
 		netpoll_cleanup(&nt->np);
 	}
 
-	nt->enabled = enabled;
-
 	mutex_unlock(&dynamic_netconsole_mutex);
 	return strnlen(buf, count);
 out_unlock:
-- 
2.43.0