diff options
Diffstat (limited to 'include/linux/mtd/mtd.h')
| -rw-r--r-- | include/linux/mtd/mtd.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h index 305f12b940f..6c91ba59c22 100644 --- a/include/linux/mtd/mtd.h +++ b/include/linux/mtd/mtd.h @@ -406,16 +406,22 @@ static inline void mtd_sync(struct mtd_info *mtd) /* Chip-supported device locking */ static inline int mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len) { + if (!mtd->lock) + return -EOPNOTSUPP; return mtd->lock(mtd, ofs, len); } static inline int mtd_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len) { + if (!mtd->unlock) + return -EOPNOTSUPP; return mtd->unlock(mtd, ofs, len); } static inline int mtd_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len) { + if (!mtd->is_locked) + return -EOPNOTSUPP; return mtd->is_locked(mtd, ofs, len); } |