From b91671bb23a79c32a23b0ad5d6e6ad292bb21bdf Mon Sep 17 00:00:00 2001 From: Richard Weinberger Date: Fri, 19 Sep 2014 17:37:56 +0200 Subject: UBI: Fix livelock in produce_free_peb() The while loop in produce_free_peb() assumes that each work will produce a free PEB. This is not true. If ubi->works_count is 1 and the only scheduled work is the wear_leveling_worker() produce_free_peb() can loop forever in case nobody schedules an erase work. Fix this issue by checking in the while loop whether work is scheduled. Signed-off-by: Richard Weinberger Signed-off-by: Artem Bityutskiy --- drivers/mtd/ubi/wl.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/mtd') diff --git a/drivers/mtd/ubi/wl.c b/drivers/mtd/ubi/wl.c index 20f49171314..32b3c1486a0 100644 --- a/drivers/mtd/ubi/wl.c +++ b/drivers/mtd/ubi/wl.c @@ -272,7 +272,7 @@ static int produce_free_peb(struct ubi_device *ubi) { int err; - while (!ubi->free.rb_node) { + while (!ubi->free.rb_node && ubi->works_count) { spin_unlock(&ubi->wl_lock); dbg_wl("do one work synchronously"); -- cgit v1.2.3-70-g09d2