diff options
Diffstat (limited to 'drivers/mtd/ubi/wl.c')
| -rw-r--r-- | drivers/mtd/ubi/wl.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/mtd/ubi/wl.c b/drivers/mtd/ubi/wl.c index b9b7f97db837..b8ad5e005cdc 100644 --- a/drivers/mtd/ubi/wl.c +++ b/drivers/mtd/ubi/wl.c @@ -641,6 +641,7 @@ void ubi_refill_pools(struct ubi_device *ubi) /* ubi_wl_get_peb - works exaclty like __wl_get_peb but keeps track of * the fastmap pool. + * Returns with ubi->fm_sem held in read mode! */ int ubi_wl_get_peb(struct ubi_device *ubi) { @@ -649,16 +650,20 @@ int ubi_wl_get_peb(struct ubi_device *ubi) struct ubi_fm_pool *wl_pool = &ubi->fm_wl_pool; again: + down_read(&ubi->fm_sem); spin_lock(&ubi->wl_lock); /* We check here also for the WL pool because at this point we can * refill the WL pool synchronous. */ if (pool->used == pool->size || wl_pool->used == wl_pool->size) { spin_unlock(&ubi->wl_lock); + up_read(&ubi->fm_sem); ret = ubi_update_fastmap(ubi); if (ret) { ubi_msg(ubi, "Unable to write a new fastmap: %i", ret); + down_read(&ubi->fm_sem); return -ENOSPC; } + down_read(&ubi->fm_sem); spin_lock(&ubi->wl_lock); } @@ -670,6 +675,7 @@ again: goto out; } retried = 1; + up_read(&ubi->fm_sem); goto again; } @@ -725,6 +731,7 @@ int ubi_wl_get_peb(struct ubi_device *ubi) spin_lock(&ubi->wl_lock); peb = wl_get_peb(ubi); spin_unlock(&ubi->wl_lock); + down_read(&ubi->fm_sem); if (peb < 0) return peb; |