Commit 8596813a authored Jul 25, 2019 by Richard Weinberger

ubi: Don't do anchor move within fastmap area



To make sure that Fastmap can use a PEB within the first 64
PEBs, UBI moves blocks away from that area.
It uses regular wear-leveling for that job.

An anchor move can be triggered if no PEB is free in this area
or because of anticipation. In the latter case it can happen
that UBI decides to move a block but finds a free PEB
within the same area.
This case is in vain an increases only erase counters.

Catch this case and cancel wear-leveling if this happens.

Signed-off-by: Richard Weinberger <richard@nod.at>

parent cbc898d5

drivers/mtd/ubi/wl.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -710,6 +710,12 @@ static int wear_leveling_worker(struct ubi_device ubi, struct ubi_work wrk,
		if (!e2)
		goto out_cancel;

		/*
		* Anchor move within the anchor area is useless.
		*/
		if (e2->pnum < UBI_FM_MAX_START)
		goto out_cancel;

		self_check_in_wl_tree(ubi, e1, &ubi->used);
		rb_erase(&e1->u.rb, &ubi->used);
		dbg_wl("anchor-move PEB %d to PEB %d", e1->pnum, e2->pnum);

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