Author: manu
Date: Thu Nov 30 12:38:42 2017
New Revision: 326394
URL: https://svnweb.freebsd.org/changeset/base/326394
Log:
devfs: Avoid a malloc/free if we just need to increment the refcount
MFC after: 1 week
Sponsored by: Gandi.net
Modified:
head/sys/fs/devfs/devfs_dir.c
Modified: head/sys/fs/devfs/devfs_dir.c
==============================================================================
--- head/sys/fs/devfs/devfs_dir.c Thu Nov 30 12:22:15 2017
(r326393)
+++ head/sys/fs/devfs/devfs_dir.c Thu Nov 30 12:38:42 2017
(r326394)
@@ -98,19 +98,18 @@ devfs_dir_ref(const char *dir)
if (*dir == '\0')
return;
- dle_new = malloc(sizeof(*dle), M_DEVFS4, M_WAITOK);
- dle_new->dir = strdup(dir, M_DEVFS4);
- dle_new->refcnt = 1;
-
mtx_lock(&dirlist_mtx);
dle = devfs_dir_findent_locked(dir);
if (dle != NULL) {
dle->refcnt++;
mtx_unlock(&dirlist_mtx);
- free(dle_new->dir, M_DEVFS4);
- free(dle_new, M_DEVFS4);
return;
}
+
+ dle_new = malloc(sizeof(*dle), M_DEVFS4, M_WAITOK);
+ dle_new->dir = strdup(dir, M_DEVFS4);
+ dle_new->refcnt = 1;
+
LIST_INSERT_HEAD(&devfs_dirlist, dle_new, link);
mtx_unlock(&dirlist_mtx);
}
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