mtd: add an ioctl to query the lock status of a flash sector

This patchs adds a way for user space programs to find out whether a
flash sector is locked. An optional driver method in the mtd_info struct
provides the information.

Signed-off-by: Richard Cochran <richard.cochran@omicron.at>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
index b8043a9ba32d..4c539ded0b70 100644
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -264,6 +264,14 @@ static int part_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
         return part->master->unlock(part->master, ofs + part->offset, len);
 }
 
+static int part_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len)
+{
+        struct mtd_part *part = PART(mtd);
+        if ((len + ofs) > mtd->size)
+                return -EINVAL;
+        return part->master->is_locked(part->master, ofs + part->offset, len);
+}
+
 static void part_sync(struct mtd_info *mtd)
 {
         struct mtd_part *part = PART(mtd);
@@ -402,6 +410,8 @@ static struct mtd_part *add_one_partition(struct mtd_info *master,
                 slave->mtd.lock = part_lock;
         if (master->unlock)
                 slave->mtd.unlock = part_unlock;
+        if (master->is_locked)
+                slave->mtd.is_locked = part_is_locked;
         if (master->block_isbad)
                 slave->mtd.block_isbad = part_block_isbad;
         if (master->block_markbad)