depmod: simple memory optimization

function                                             old     new   delta
filename2modname                                      67      86     +19
parse_module                                         374     351     -23

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/modutils/modutils.c b/modutils/modutils.c
index ff79d3f..84300d9 100644
--- a/modutils/modutils.c
+++ b/modutils/modutils.c
@@ -47,13 +47,14 @@ int FAST_FUNC string_to_llist(char *string, llist_t **llist, const char *delim)
 
 char* FAST_FUNC filename2modname(const char *filename, char *modname)
 {
+	char local_modname[MODULE_NAME_LEN];
 	int i;
 	const char *from;
 
 	if (filename == NULL)
 		return NULL;
 	if (modname == NULL)
-		modname = xmalloc(MODULE_NAME_LEN);
+		modname = local_modname;
 	// Disabled since otherwise "modprobe dir/name" would work
 	// as if it is "modprobe name". It is unclear why
 	// 'basenamization' was here in the first place.
@@ -63,6 +64,9 @@ char* FAST_FUNC filename2modname(const char *filename, char *modname)
 		modname[i] = (from[i] == '-') ? '_' : from[i];
 	modname[i] = '\0';
 
+	if (modname == local_modname)
+		return xstrdup(modname);
+
 	return modname;
 }