connector/cn_proc: revert "connector: Fix proc_event_num_listeners count not cleared"

This reverts commit c46bfba1337d ("connector: Fix proc_event_num_listeners
count not cleared").

It is not accurate to reset proc_event_num_listeners according to
cn_netlink_send_mult() return value -ESRCH.

In the case of stress-ng netlink-proc, -ESRCH will always be returned,
because netlink_broadcast_filtered will return -ESRCH,
which may cause stress-ng netlink-proc performance degradation.

Reported-by: kernel test robot <oliver.sang@intel.com>
Closes: https://lore.kernel.org/oe-lkp/202401112259.b23a1567-oliver.sang@intel.com
Fixes: c46bfba1337d ("connector: Fix proc_event_num_listeners count not cleared")
Signed-off-by: Keqi Wang <wangkeqi_chris@163.com>
Link: https://lore.kernel.org/r/20240209091659.68723-1-wangkeqi_chris@163.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

diff --git a/drivers/connector/cn_proc.c b/drivers/connector/cn_proc.c
index 3d5e6d705fc6ee3a0224a0b1fa57c32076fe306f..44b19e69617632bf4951d8da1e514f9c0c689d4b 100644 (file)
--- a/drivers/connector/cn_proc.c
+++ b/drivers/connector/cn_proc.c
@@ -108,9 +108,8 @@ static inline void send_msg(struct cn_msg *msg)
                filter_data[1] = 0;
        }
 
-       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);
+       cn_netlink_send_mult(msg, msg->len, 0, CN_IDX_PROC, GFP_NOWAIT,
+                            cn_filter, (void *)filter_data);
 
        local_unlock(&local_event.lock);
 }