diff options
Diffstat (limited to 'drivers/mtd/mtdcore.c')
| -rw-r--r-- | drivers/mtd/mtdcore.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c index b20346e9fec..6acc4fb254e 100644 --- a/drivers/mtd/mtdcore.c +++ b/drivers/mtd/mtdcore.c @@ -695,6 +695,11 @@ int mtd_erase(struct mtd_info *mtd, struct erase_info *instr) return -EINVAL; if (!(mtd->flags & MTD_WRITEABLE)) return -EROFS; + if (!instr->len) { + instr->state = MTD_ERASE_DONE; + mtd_erase_callback(instr); + return 0; + } return mtd->_erase(mtd, instr); } EXPORT_SYMBOL_GPL(mtd_erase); @@ -713,6 +718,8 @@ int mtd_point(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, return -EOPNOTSUPP; if (from < 0 || from > mtd->size || len > mtd->size - from) return -EINVAL; + if (!len) + return 0; return mtd->_point(mtd, from, len, retlen, virt, phys); } EXPORT_SYMBOL_GPL(mtd_point); @@ -724,6 +731,8 @@ int mtd_unpoint(struct mtd_info *mtd, loff_t from, size_t len) return -EOPNOTSUPP; if (from < 0 || from > mtd->size || len > mtd->size - from) return -EINVAL; + if (!len) + return 0; return mtd->_unpoint(mtd, from, len); } EXPORT_SYMBOL_GPL(mtd_unpoint); @@ -750,6 +759,8 @@ int mtd_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, *retlen = 0; if (from < 0 || from > mtd->size || len > mtd->size - from) return -EINVAL; + if (!len) + return 0; return mtd->_read(mtd, from, len, retlen, buf); } EXPORT_SYMBOL_GPL(mtd_read); @@ -762,6 +773,8 @@ int mtd_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, return -EINVAL; if (!mtd->_write || !(mtd->flags & MTD_WRITEABLE)) return -EROFS; + if (!len) + return 0; return mtd->_write(mtd, to, len, retlen, buf); } EXPORT_SYMBOL_GPL(mtd_write); @@ -783,6 +796,8 @@ int mtd_panic_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, return -EINVAL; if (!(mtd->flags & MTD_WRITEABLE)) return -EROFS; + if (!len) + return 0; return mtd->_panic_write(mtd, to, len, retlen, buf); } EXPORT_SYMBOL_GPL(mtd_panic_write); @@ -794,6 +809,8 @@ int mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len) return -EOPNOTSUPP; if (ofs < 0 || ofs > mtd->size || len > mtd->size - ofs) return -EINVAL; + if (!len) + return 0; return mtd->_lock(mtd, ofs, len); } EXPORT_SYMBOL_GPL(mtd_lock); @@ -804,6 +821,8 @@ int mtd_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len) return -EOPNOTSUPP; if (ofs < 0 || ofs > mtd->size || len > mtd->size - ofs) return -EINVAL; + if (!len) + return 0; return mtd->_unlock(mtd, ofs, len); } EXPORT_SYMBOL_GPL(mtd_unlock); @@ -814,6 +833,8 @@ int mtd_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len) return -EOPNOTSUPP; if (ofs < 0 || ofs > mtd->size || len > mtd->size - ofs) return -EINVAL; + if (!len) + return 0; return mtd->_is_locked(mtd, ofs, len); } EXPORT_SYMBOL_GPL(mtd_is_locked); |