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>
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cbc898d52c
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8596813a11
drivers/mtd/ubi
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@ -710,6 +710,12 @@ static int wear_leveling_worker(struct ubi_device *ubi, struct ubi_work *wrk,
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if (!e2)
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if (!e2)
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goto out_cancel;
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goto out_cancel;
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/*
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* Anchor move within the anchor area is useless.
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*/
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if (e2->pnum < UBI_FM_MAX_START)
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goto out_cancel;
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self_check_in_wl_tree(ubi, e1, &ubi->used);
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self_check_in_wl_tree(ubi, e1, &ubi->used);
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rb_erase(&e1->u.rb, &ubi->used);
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rb_erase(&e1->u.rb, &ubi->used);
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dbg_wl("anchor-move PEB %d to PEB %d", e1->pnum, e2->pnum);
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dbg_wl("anchor-move PEB %d to PEB %d", e1->pnum, e2->pnum);
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