linux-kernel - [PATCH v2] tracing/histograms: Return an error if we fail to add histogram to hist

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Date:   Fri, 14 Jul 2023 20:33:41 +0000
From:   Mohamed Khalfella <mkhalfella@...estorage.com>
To:     mhiramat@...nel.org
Cc:     Mohamed Khalfella <mkhalfella@...estorage.com>,
        stable@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
        linux-kernel@...r.kernel.org (open list:TRACING),
        linux-trace-kernel@...r.kernel.org (open list:TRACING)
Subject: [PATCH v2] tracing/histograms: Return an error if we fail to add histogram to hist_vars list

Commit 6018b585e8c6 ("tracing/histograms: Add histograms to hist_vars if
they have referenced variables") added a check to fail histogram creation
if save_hist_vars() failed to add histogram to hist_vars list. But the
commit failed to set ret to failed return code before jumping to
unregister histogram, fix it.

Cc: stable@...r.kernel.org
Fixes: 6018b585e8c6 ("tracing/histograms: Add histograms to hist_vars if they have referenced variables")
Signed-off-by: Mohamed Khalfella <mkhalfella@...estorage.com>
---
 kernel/trace/trace_events_hist.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index c8c61381eba4..d06938ae0717 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -6668,7 +6668,8 @@ static int event_hist_trigger_parse(struct event_command *cmd_ops,
 		goto out_unreg;
 
 	if (has_hist_vars(hist_data) || hist_data->n_var_refs) {
-		if (save_hist_vars(hist_data))
+		ret = save_hist_vars(hist_data);
+		if (ret)
 			goto out_unreg;
 	}
 
-- 
2.34.1