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connector: Fix proc_event_num_listeners count not cleared

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[ Upstream commit c46bfba1337d301661dbb23cfd905d4cb51f27ca ]

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@didiglobal.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
wangkeqi 2023-12-23 14:50:32 +08:00 • committed by Greg Kroah-Hartman
parent 6a186b28c4
commit 1e6b9bc8cc
1 changed files with 3 additions and 2 deletions
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5
drivers/connector/cn_proc.c
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@ -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);
}