perf config: Check error cases of {show_spec, set}_config()

show_spec_config() and set_config() can be called multiple times
in the loop in cmd_config().

However, The error cases of them wasn't checked, so fix it.

Reported-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Taeung Song <treeze.taeung@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/r/1497671197-20450-1-git-send-email-treeze.taeung@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 15 insertions, 2 deletions

diff --git a/tools/perf/builtin-config.c b/tools/perf/builtin-config.c
index 75459668edb2..bb1be79bceda 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);
                 }
         }