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path: root/drivers/mtd/ubi/build.c
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Diffstat (limited to 'drivers/mtd/ubi/build.c')
-rw-r--r--drivers/mtd/ubi/build.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c
index 5490a73deca..44c852144a9 100644
--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -67,6 +67,9 @@ struct ubi_device *ubi_devices[UBI_MAX_DEVICES];
/* Root UBI "class" object (corresponds to '/<sysfs>/class/ubi/') */
struct class *ubi_class;
+/* Slab cache for lock-tree entries */
+struct kmem_cache *ubi_ltree_slab;
+
/* "Show" method for files in '/<sysfs>/class/ubi/' */
static ssize_t ubi_version_show(struct class *class, char *buf)
{
@@ -687,6 +690,20 @@ static void detach_mtd_dev(struct ubi_device *ubi)
ubi_msg("mtd%d is detached from ubi%d", mtd_num, ubi_num);
}
+/**
+ * ltree_entry_ctor - lock tree entries slab cache constructor.
+ * @obj: the lock-tree entry to construct
+ * @cache: the lock tree entry slab cache
+ * @flags: constructor flags
+ */
+static void ltree_entry_ctor(struct kmem_cache *cache, void *obj)
+{
+ struct ubi_ltree_entry *le = obj;
+
+ le->users = 0;
+ init_rwsem(&le->mutex);
+}
+
static int __init ubi_init(void)
{
int err, i, k;
@@ -709,6 +726,12 @@ static int __init ubi_init(void)
if (err)
goto out_class;
+ ubi_ltree_slab = kmem_cache_create("ubi_ltree_slab",
+ sizeof(struct ubi_ltree_entry), 0,
+ 0, &ltree_entry_ctor);
+ if (!ubi_ltree_slab)
+ goto out_version;
+
/* Attach MTD devices */
for (i = 0; i < mtd_devs; i++) {
struct mtd_dev_param *p = &mtd_dev_param[i];
@@ -724,6 +747,8 @@ static int __init ubi_init(void)
out_detach:
for (k = 0; k < i; k++)
detach_mtd_dev(ubi_devices[k]);
+ kmem_cache_destroy(ubi_ltree_slab);
+out_version:
class_remove_file(ubi_class, &ubi_version);
out_class:
class_destroy(ubi_class);
@@ -737,6 +762,7 @@ static void __exit ubi_exit(void)
for (i = 0; i < n; i++)
detach_mtd_dev(ubi_devices[i]);
+ kmem_cache_destroy(ubi_ltree_slab);
class_remove_file(ubi_class, &ubi_version);
class_destroy(ubi_class);
}