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Commit 1cb8f977 authored by Richard Weinberger's avatar Richard Weinberger
Browse files

ubi: fastmap: Implement produce_free_peb() 



If fastmap requests a free PEB for a pool and UBI is busy
with erasing PEBs we need to offer a function to wait for one.
We can reuse produce_free_peb() from the non-fastmap WL code
but with different locking semantics.

Cc: stable@vger.kernel.org # 4.1.x-
Reported-and-tested-by: default avatarJörg Krause <joerg.krause@embedded.rocks>
Signed-off-by: default avatarRichard Weinberger <richard@nod.at>
parent be186cc4

drivers/mtd/ubi/fastmap-wl.c

+29 −0
Original line number Diff line number Diff line
@@ -171,6 +171,30 @@ void ubi_refill_pools(struct ubi_device *ubi) 
	spin_unlock(&ubi->wl_lock);

}



/**

 * produce_free_peb - produce a free physical eraseblock.

 * @ubi: UBI device description object

 *

 * This function tries to make a free PEB by means of synchronous execution of

 * pending works. This may be needed if, for example the background thread is

 * disabled. Returns zero in case of success and a negative error code in case

 * of failure.

 */

static int produce_free_peb(struct ubi_device *ubi)

{

	int err;



	while (!ubi->free.rb_node && ubi->works_count) {

		dbg_wl("do one work synchronously");

		err = do_work(ubi);



		if (err)

			return err;

	}



	return 0;

}



/**

 * ubi_wl_get_peb - get a physical eraseblock.

 * @ubi: UBI device description object
@@ -213,6 +237,11 @@ int ubi_wl_get_peb(struct ubi_device *ubi) 
		}

		retried = 1;

		up_read(&ubi->fm_eba_sem);

		ret = produce_free_peb(ubi);

		if (ret < 0) {

			down_read(&ubi->fm_eba_sem);

			goto out;

		}

		goto again;

	}