[Blackfin] serial driver: Fix bug serial driver in DMA mode spams history to...
[Blackfin] serial driver: Fix bug serial driver in DMA mode spams history to console on shell restart http://blackfin.uclinux.org/gf/project/uclinux-dist/tracker/?action=TrackerItemEdit&tracker_item_id=2920 Fix by increasing buffer tail immediately before starting tx dma. Signed-off-by: NSonic Zhang <sonic.zhang@analog.com> Signed-off-by: NBryan Wu <bryan.wu@analog.com>
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