mtd_blkdevs: Add background processing support
Add a new background method into mtd_blktrans_ops, add background support into mtd_blktrans_thread(), and add mtd_blktrans_cease_background(). If the mtd blktrans dev has the background support, the thread will call background function when the request queue becomes empty. The background operation may run as long as needs to until mtd_blktrans_cease_background() tells to stop. Signed-off-by: NJarkko Lavinen <jarkko.lavinen@nokia.com> Tested-by: NArtem Bityutskiy <Artem.Bityutskiy@nokia.com> Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>
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