If it returns an error, warn user and bail out instead of silently
ignoring.

Signed-off-by: Namhyung Kim <[email protected]>
---
 tools/perf/builtin-report.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 2bf537f190a0..7b933a9cf84f 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -466,10 +466,11 @@ static int report__browse_hists(struct report *rep)
        return ret;
 }
 
-static void report__collapse_hists(struct report *rep)
+static int report__collapse_hists(struct report *rep)
 {
        struct ui_progress prog;
        struct perf_evsel *pos;
+       int ret = 0;
 
        ui_progress__init(&prog, rep->nr_entries, "Merging related events...");
 
@@ -481,7 +482,9 @@ static void report__collapse_hists(struct report *rep)
 
                hists->socket_filter = rep->socket_filter;
 
-               hists__collapse_resort(hists, &prog);
+               ret = hists__collapse_resort(hists, &prog);
+               if (ret < 0)
+                       break;
 
                /* Non-group events are considered as leader */
                if (symbol_conf.event_group &&
@@ -494,6 +497,7 @@ static void report__collapse_hists(struct report *rep)
        }
 
        ui_progress__finish();
+       return ret;
 }
 
 static void report__output_resort(struct report *rep)
@@ -561,7 +565,11 @@ static int __cmd_report(struct report *rep)
                }
        }
 
-       report__collapse_hists(rep);
+       ret = report__collapse_hists(rep);
+       if (ret) {
+               ui__error("failed to process hist entry\n");
+               return ret;
+       }
 
        if (session_done())
                return 0;
-- 
2.6.4

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