[PATCH] mtd: ubi: Fix endless loop when moving PEB

[Teresa Remmet]

When moving a PEB the leb_write_trylock() function is called.
As the function never returns 0 UBI will end up in an endless
loop.

Noticed the issue when fastmap has been enabled and data is beeing copied
several times to a UBI volume. When UBI tries to move the anchor PEB,
the issue comes up.

The leb_write_trylock() is now equal to the leb_write_lock().
But kept it for easier maintaince in future when syncing with
kernel.

Signed-off-by: Teresa Remmet <t.remmet at phytec.de>
---
 drivers/mtd/ubi/eba.c | 11 +----------
 1 file changed, 1 insertion(+), 10 deletions(-)

diff --git a/drivers/mtd/ubi/eba.c b/drivers/mtd/ubi/eba.c
index a7af247..31dbcd2 100644
--- a/drivers/mtd/ubi/eba.c
+++ b/drivers/mtd/ubi/eba.c
@@ -257,16 +257,7 @@ static int leb_write_trylock(struct ubi_device *ubi, int vol_id, int lnum)
 	le = ltree_add_entry(ubi, vol_id, lnum);
 	if (IS_ERR(le))
 		return PTR_ERR(le);
-
-	/* Contention, cancel */
-	le->users -= 1;
-	ubi_assert(le->users >= 0);
-	if (le->users == 0) {
-		rb_erase(&le->rb, &ubi->ltree);
-		kfree(le);
-	}
-
-	return 1;
+	return 0;
 }
 
 /**
-- 
1.9.1