UBI: Fastmap: Ensure that only one fastmap work is scheduled
If the WL pool runs out of PEBs we schedule a fastmap write to refill it as soon as possible. Ensure that only one at a time is scheduled otherwise we might end in a fastmap write storm because writing the fastmap can schedule another write if bitflips are detected. Signed-off-by: NRichard Weinberger <richard@nod.at> Reviewed-by: NTanya Brokhman <tlinder@codeaurora.org> Reviewed-by: NGuido Martínez <guido@vanguardiasur.com.ar>
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