UBI: use separate mutex for volumes checking

Introduce a separate mutex which serializes volumes checking,
because we cammot really use volumes_mutex - it cases reverse
locking problems with mtd_tbl_mutex when gluebi is used -
thanks to lockdep.

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

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/mtd/ubi/ubi.h b/drivers/mtd/ubi/ubi.h
index 2a6171226f1f..ef22f922f580 100644
--- a/drivers/mtd/ubi/ubi.h
+++ b/drivers/mtd/ubi/ubi.h
@@ -392,6 +392,7 @@ struct ubi_device {
         void *peb_buf1;
         void *peb_buf2;
         struct mutex buf_mutex;
+        struct mutex ckvol_mutex;
 #ifdef CONFIG_MTD_UBI_DEBUG
         void *dbg_peb_buf;
         struct mutex dbg_buf_mutex;