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UBI: Fastmap: Locking updates

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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>
This commit is contained in:
Richard Weinberger
2014-11-10 16:28:08 +01:00
parent 42dd3cdcd6
commit 111ab0b26f
5 changed files with 50 additions and 44 deletions
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4
drivers/mtd/ubi/build.c
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@@ -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);