From: Daniel Bristot de Oliveira <bristot@kernel.org>
Date: Wed, 29 Mar 2023 17:50:16 +0200
Subject: [PATCH] tracing/osnoise: Fix notify new tracing_max_latency
References: bsc#1012628
Patch-mainline: 6.2.11
Git-commit: d3cba7f02cd82118c32651c73374d8a5a459d9a6

commit d3cba7f02cd82118c32651c73374d8a5a459d9a6 upstream.

osnoise/timerlat tracers are reporting new max latency on instances
where the tracing is off, creating inconsistencies between the max
reported values in the trace and in the tracing_max_latency. Thus
only report new tracing_max_latency on active tracing instances.

Link: https://lkml.kernel.org/r/ecd109fde4a0c24ab0f00ba1e9a144ac19a91322.1680104184.git.bristot@kernel.org

Cc: stable@vger.kernel.org
Fixes: dae181349f1e ("tracing/osnoise: Support a list of trace_array *tr")
Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 kernel/trace/trace_osnoise.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/trace/trace_osnoise.c b/kernel/trace/trace_osnoise.c
index c732287f..2a1b337a 100644
--- a/kernel/trace/trace_osnoise.c
+++ b/kernel/trace/trace_osnoise.c
@@ -1296,7 +1296,7 @@ static void notify_new_max_latency(u64 latency)
 	rcu_read_lock();
 	list_for_each_entry_rcu(inst, &osnoise_instances, list) {
 		tr = inst->tr;
-		if (tr->max_latency < latency) {
+		if (tracer_tracing_is_on(tr) && tr->max_latency < latency) {
 			tr->max_latency = latency;
 			latency_fsnotify(tr);
 		}
-- 
2.35.3