diff options
-rw-r--r-- | drivers/mtd/mtdcore.c | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c index 46f15f676491..9bd661be3ae9 100644 --- a/drivers/mtd/mtdcore.c +++ b/drivers/mtd/mtdcore.c @@ -1247,14 +1247,15 @@ int __get_mtd_device(struct mtd_info *mtd) return -ENODEV; } - kref_get(&mtd->refcnt); - - while (mtd->parent) { - if (IS_ENABLED(CONFIG_MTD_PARTITIONED_MASTER) || mtd->parent != master) - kref_get(&mtd->parent->refcnt); + while (mtd) { + if (mtd != master) + kref_get(&mtd->refcnt); mtd = mtd->parent; } + if (IS_ENABLED(CONFIG_MTD_PARTITIONED_MASTER)) + kref_get(&master->refcnt); + return 0; } EXPORT_SYMBOL_GPL(__get_mtd_device); @@ -1338,10 +1339,12 @@ void __put_mtd_device(struct mtd_info *mtd) { struct mtd_info *master = mtd_get_master(mtd); - while (mtd != master) { + while (mtd) { + /* kref_put() can relese mtd, so keep a reference mtd->parent */ struct mtd_info *parent = mtd->parent; - kref_put(&mtd->refcnt, mtd_device_release); + if (mtd != master) + kref_put(&mtd->refcnt, mtd_device_release); mtd = parent; } |