perf tools: No need to test against NULL before calling free()

Its perfectly fine to call free(NULL), so no need to clutter the source
code with all those superfluous testing.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-uux5wpvevlerd42gqer13e7n@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
index 5a80da6..a6ec105 100644 (file)
--- a/tools/perf/builtin-kvm.c
+++ b/tools/perf/builtin-kvm.c
@@ -1158,9 +1158,7 @@ out:
        if (kvm->timerfd >= 0)
                close(kvm->timerfd);
 
-       if (pollfds)
-               free(pollfds);
-
+       free(pollfds);
        return err;
 }
 

diff --git a/tools/perf/ui/browsers/scripts.c b/tools/perf/ui/browsers/scripts.c
index d63c68e..402d2bd 100644 (file)
--- a/tools/perf/ui/browsers/scripts.c
+++ b/tools/perf/ui/browsers/scripts.c
@@ -173,8 +173,7 @@ int script_browse(const char *script_opt)
        if (script.b.width > AVERAGE_LINE_LEN)
                script.b.width = AVERAGE_LINE_LEN;
 
-       if (line)
-               free(line);
+       free(line);
        pclose(fp);
 
        script.nr_lines = nr_entries;

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 61c5421..10730b0 100644 (file)
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -1232,10 +1232,8 @@ static void free_event_desc(struct perf_evsel *events)
                return;
 
        for (evsel = events; evsel->attr.size; evsel++) {
-               if (evsel->name)
-                       free(evsel->name);
-               if (evsel->id)
-                       free(evsel->id);
+               free(evsel->name);
+               free(evsel->id);
        }
 
        free(events);

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 72b56ae..095a98e 100644 (file)
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -401,9 +401,7 @@ static int add_module_to_probe_trace_events(struct probe_trace_event *tevs,
                }
        }
 
-       if (tmp)
-               free(tmp);
-
+       free(tmp);
        return ret;
 }
 
@@ -1382,8 +1380,7 @@ static char *synthesize_perf_probe_point(struct perf_probe_point *pp)
 error:
        pr_debug("Failed to synthesize perf probe point: %s\n",
                 strerror(-ret));
-       if (buf)
-               free(buf);
+       free(buf);
        return NULL;
 }
 
@@ -1584,34 +1581,25 @@ void clear_perf_probe_event(struct perf_probe_event *pev)
        struct perf_probe_arg_field *field, *next;
        int i;
 
-       if (pev->event)
-               free(pev->event);
-       if (pev->group)
-               free(pev->group);
-       if (pp->file)
-               free(pp->file);
-       if (pp->function)
-               free(pp->function);
-       if (pp->lazy_line)
-               free(pp->lazy_line);
+       free(pev->event);
+       free(pev->group);
+       free(pp->file);
+       free(pp->function);
+       free(pp->lazy_line);
+
        for (i = 0; i < pev->nargs; i++) {
-               if (pev->args[i].name)
-                       free(pev->args[i].name);
-               if (pev->args[i].var)
-                       free(pev->args[i].var);
-               if (pev->args[i].type)
-                       free(pev->args[i].type);
+               free(pev->args[i].name);
+               free(pev->args[i].var);
+               free(pev->args[i].type);
                field = pev->args[i].field;
                while (field) {
                        next = field->next;
-                       if (field->name)
-                               free(field->name);
+                       free(field->name);
                        free(field);
                        field = next;
                }
        }
-       if (pev->args)
-               free(pev->args);
+       free(pev->args);
        memset(pev, 0, sizeof(*pev));
 }
 
@@ -1620,21 +1608,14 @@ static void clear_probe_trace_event(struct probe_trace_event *tev)
        struct probe_trace_arg_ref *ref, *next;
        int i;
 
-       if (tev->event)
-               free(tev->event);
-       if (tev->group)
-               free(tev->group);
-       if (tev->point.symbol)
-               free(tev->point.symbol);
-       if (tev->point.module)
-               free(tev->point.module);
+       free(tev->event);
+       free(tev->group);
+       free(tev->point.symbol);
+       free(tev->point.module);
        for (i = 0; i < tev->nargs; i++) {
-               if (tev->args[i].name)
-                       free(tev->args[i].name);
-               if (tev->args[i].value)
-                       free(tev->args[i].value);
-               if (tev->args[i].type)
-                       free(tev->args[i].type);
+               free(tev->args[i].name);
+               free(tev->args[i].value);
+               free(tev->args[i].type);
                ref = tev->args[i].ref;
                while (ref) {
                        next = ref->next;
@@ -1642,8 +1623,7 @@ static void clear_probe_trace_event(struct probe_trace_event *tev)
                        ref = next;
                }
        }
-       if (tev->args)
-               free(tev->args);
+       free(tev->args);
        memset(tev, 0, sizeof(*tev));
 }
 

diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index 7db7e05..8c08735 100644 (file)
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -1414,10 +1414,8 @@ int debuginfo__find_available_vars_at(struct debuginfo *dbg,
        if (ret < 0) {
                /* Free vlist for error */
                while (af.nvls--) {
-                       if (af.vls[af.nvls].point.symbol)
-                               free(af.vls[af.nvls].point.symbol);
-                       if (af.vls[af.nvls].vars)
-                               strlist__delete(af.vls[af.nvls].vars);
+                       free(af.vls[af.nvls].point.symbol);
+                       strlist__delete(af.vls[af.nvls].vars);
                }
                free(af.vls);
                *vls = NULL;
@@ -1524,10 +1522,8 @@ post:
        if (fname) {
                ppt->file = strdup(fname);
                if (ppt->file == NULL) {
-                       if (ppt->function) {
-                               free(ppt->function);
-                               ppt->function = NULL;
-                       }
+                       free(ppt->function);
+                       ppt->function = NULL;
                        ret = -ENOMEM;
                        goto end;
                }

diff --git a/tools/perf/util/scripting-engines/trace-event-perl.c b/tools/perf/util/scripting-engines/trace-event-perl.c
index 3773c48..e108207 100644 (file)
--- a/tools/perf/util/scripting-engines/trace-event-perl.c
+++ b/tools/perf/util/scripting-engines/trace-event-perl.c
@@ -194,8 +194,7 @@ static void define_event_symbols(struct event_format *event,
                zero_flag_atom = 0;
                break;
        case PRINT_FIELD:
-               if (cur_field_name)
-                       free(cur_field_name);
+               free(cur_field_name);
                cur_field_name = strdup(args->field.name);
                break;
        case PRINT_FLAGS:

diff --git a/tools/perf/util/scripting-engines/trace-event-python.c b/tools/perf/util/scripting-engines/trace-event-python.c
index b258de6..cd9774d 100644 (file)
--- a/tools/perf/util/scripting-engines/trace-event-python.c
+++ b/tools/perf/util/scripting-engines/trace-event-python.c
@@ -161,8 +161,7 @@ static void define_event_symbols(struct event_format *event,
                zero_flag_atom = 0;
                break;
        case PRINT_FIELD:
-               if (cur_field_name)
-                       free(cur_field_name);
+               free(cur_field_name);
                cur_field_name = strdup(args->field.name);
                break;
        case PRINT_FLAGS: