[PATCH v3 1/7] perf config: Handle errors from {show_spec, set}_config() in the loop

[Taeung Song <treeze.taeung@gmail.com>]

show_spec_config() and set_config() can be called multiple times
in the loop in cmd_config(). However, the return values from them did not checked.
Even though one of the return values means a error (i.e. -1),
it can be just skipped. It is a bug, so fix it.

Check each return value from show_spec_config() and set_config()
in the loop in cmd_config() and if the return value means a error, handle it.

Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Reported-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Taeung Song <treeze.taeung@gmail.com>
---
 tools/perf/builtin-config.c | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-config.c b/tools/perf/builtin-config.c
index 7545966..bb1be79 100644
--- a/tools/perf/builtin-config.c
+++ b/tools/perf/builtin-config.c
@@ -225,10 +225,23 @@ int cmd_config(int argc, const char **argv)
 				break;
 			}
 
-			if (value == NULL)
+			if (value == NULL) {
 				ret = show_spec_config(set, var);
-			else
+				if (ret < 0) {
+					pr_err("%s is not configured: %s\n",
+					       var, config_filename);
+					free(arg);
+					break;
+				}
+			} else {
 				ret = set_config(set, config_filename, var, value);
+				if (ret < 0) {
+					pr_err("Failed to set '%s=%s' on %s\n",
+					       var, value, config_filename);
+					free(arg);
+					break;
+				}
+			}
 			free(arg);
 		}
 	}
-- 
2.7.4