UBI: add some more comments

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

1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/mtd/ubi/eba.c b/drivers/mtd/ubi/eba.c
index b2b0f29bdc53..2ff34923e51d 100644
--- 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];