UBI: add some more comments

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

diff --git a/drivers/mtd/ubi/eba.c b/drivers/mtd/ubi/eba.c
index b2b0f29..2ff3492 100644 (file)
--- a/drivers/mtd/ubi/eba.c
+++ b/drivers/mtd/ubi/eba.c
@@ -797,7 +797,7 @@ write_error:
 /*
  * ubi_eba_atomic_leb_change - change logical eraseblock atomically.
  * @ubi: UBI device description object
- * @vol: volume escription object
+ * @vol: volume description object
  * @lnum: logical eraseblock number
  * @buf: data to write
  * @len: how many bytes to write
@@ -955,6 +955,12 @@ int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to,
        /*
         * We may race with volume deletion/re-size, so we have to hold
         * @ubi->volumes_lock.
+        *
+        * Note, it is not a problem if we race with volume deletion or re-size
+        * here. If the volume is deleted or re-sized while we are moving an
+        * eraseblock which belongs to this volume, we'll end up with finding
+        * out that this LEB was unmapped at the end (see WL), and drop this
+        * PEB.
         */
        spin_lock(&ubi->volumes_lock);
        vol = ubi->volumes[idx];