netdev - [PATCH] connector: Fix proc_event_num

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Message-Id: <20231223065032.20498-1-wangkeqi_chris@163.com>
Date: Sat, 23 Dec 2023 14:50:32 +0800
From: wangkeqi <wangkeqi_chris@....com>
To: davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com
Cc: netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	wangkeqi <wangkeqiwang@...iglobal.com>
Subject: [PATCH] connector: Fix proc_event_num_listeners count not cleared

From: wangkeqi <wangkeqiwang@...iglobal.com>

When we register a cn_proc listening event, the proc_event_num_listener
variable will be incremented by one, but if PROC_CN_MCAST_IGNORE is
not called, the count will not decrease.
This will cause the proc_*_connector function to take the wrong path.
It will reappear when the forkstat tool exits via ctrl + c.
We solve this problem by determining whether
there are still listeners to clear proc_event_num_listener.

Signed-off-by: wangkeqi <wangkeqiwang@...iglobal.com>
---
 drivers/connector/cn_proc.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/connector/cn_proc.c b/drivers/connector/cn_proc.c
index 44b19e696..3d5e6d705 100644
--- a/drivers/connector/cn_proc.c
+++ b/drivers/connector/cn_proc.c
@@ -108,8 +108,9 @@ static inline void send_msg(struct cn_msg *msg)
 		filter_data[1] = 0;
 	}
 
-	cn_netlink_send_mult(msg, msg->len, 0, CN_IDX_PROC, GFP_NOWAIT,
-			     cn_filter, (void *)filter_data);
+	if (cn_netlink_send_mult(msg, msg->len, 0, CN_IDX_PROC, GFP_NOWAIT,
+			     cn_filter, (void *)filter_data) == -ESRCH)
+		atomic_set(&proc_event_num_listeners, 0);
 
 	local_unlock(&local_event.lock);
 }
-- 
2.27.0