UBI: Fastmap: Locking updates

a) Rename ubi->fm_sem to ubi->fm_eba_sem as this semaphore
protects EBA changes.
b) Turn ubi->fm_mutex into a rw semaphore. It will still serialize
fastmap writes but also ensures that ubi_wl_put_peb() is not
interrupted by a fastmap write. We use a rw semaphore to allow
ubi_wl_put_peb() still to be executed in parallel if no fastmap
write is happening.

Signed-off-by: Richard Weinberger <richard@nod.at>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c
index 59af91b41f9a..a7571508fdab 100644
--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -969,8 +969,8 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num,
         mutex_init(&ubi->ckvol_mutex);
         mutex_init(&ubi->device_mutex);
         spin_lock_init(&ubi->volumes_lock);
-        mutex_init(&ubi->fm_mutex);
-        init_rwsem(&ubi->fm_sem);
+        init_rwsem(&ubi->fm_protect);
+        init_rwsem(&ubi->fm_eba_sem);
 
         ubi_msg(ubi, "attaching mtd%d", mtd->index);