rtla: Fix segmentation fault when failing to enable -t

rtla osnoise and timerlat are causing a segmentation fault when running
with the --trace option on a kernel that does not support multiple
instances. For example:

    [root@f34 rtla]# rtla osnoise top -t
    failed to enable the tracer osnoise
    Could not enable osnoiser tracer for tracing
    Failed to enable the trace instance
    Segmentation fault (core dumped)

This error happens because the exit code of the tools is trying
to destroy the trace instance that failed to be created.

Make osnoise_destroy_tool() aware of possible NULL osnoise_tool *,
and do not attempt to destroy it. This also simplifies the exit code.

Link: https://lkml.kernel.org/r/5660a2b6bf66c2655842360f2d7f6b48db5dba23.1644327249.git.bristot@kernel.org

Suggested-by: Steven Rostedt <rostedt@goodmis.org>
Fixes: 1eceb2fc2ca5 ("rtla/osnoise: Add osnoise top mode")
Fixes: 829a6c0b5698 ("rtla/osnoise: Add the hist mode")
Fixes: a828cd18bc4a ("rtla: Add timerlat tool and timelart top mode")
Fixes: 1eeb6328e8b3 ("rtla/timerlat: Add timerlat hist mode")
Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

1 files changed, 3 insertions, 4 deletions

diff --git a/tools/tracing/rtla/src/timerlat_hist.c b/tools/tracing/rtla/src/timerlat_hist.c
index 235f9620ef3d..436a799f9adf 100644
--- a/tools/tracing/rtla/src/timerlat_hist.c
+++ b/tools/tracing/rtla/src/timerlat_hist.c
@@ -729,9 +729,9 @@ timerlat_hist_set_signals(struct timerlat_hist_params *params)
 int timerlat_hist_main(int argc, char *argv[])
 {
 	struct timerlat_hist_params *params;
+	struct osnoise_tool *record = NULL;
+	struct osnoise_tool *tool = NULL;
 	struct trace_instance *trace;
-	struct osnoise_tool *record;
-	struct osnoise_tool *tool;
 	int return_value = 1;
 	int retval;
 
@@ -813,9 +813,8 @@ int timerlat_hist_main(int argc, char *argv[])
 
 out_hist:
 	timerlat_free_histogram(tool->data);
+	osnoise_destroy_tool(record);
 	osnoise_destroy_tool(tool);
-	if (params->trace_output)
-		osnoise_destroy_tool(record);
 	free(params);
 out_exit:
 	exit(return_value);