6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Keqi Wang <wangkeqi_chris@xxxxxxx>
commit 8929f95b2b587791a7dcd04cc91520194a76d3a6 upstream.
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@xxxxxxxxx>
Closes: https://lore.kernel.org/oe-lkp/202401112259.b23a1567-oliver.sang@xxxxxxxxx
Fixes: c46bfba1337d ("connector: Fix proc_event_num_listeners count not cleared")
Signed-off-by: Keqi Wang <wangkeqi_chris@xxxxxxx>
Link: https://lore.kernel.org/r/20240209091659.68723-1-wangkeqi_chris@xxxxxxx
Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/connector/cn_proc.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
--- a/drivers/connector/cn_proc.c
+++ b/drivers/connector/cn_proc.c
@@ -108,9 +108,8 @@ static inline void send_msg(struct cn_ms
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);
}
