clean up DMA draining

From: Christoph Hellwig
Date: Tue Apr 14 2020 - 03:42:43 EST

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Hi all,

currently the dma draining and alignining specific to ATA CDROMs
and the UFS driver has its ugly hooks in core block code. Move
this out into the scsi and ide drivers instead.

Next message: Christoph Hellwig: "[PATCH 2/5] block: provide a blk_rq_map_sg variant that returns the last element"
Previous message: Ard Biesheuvel: "Re: [v2 PATCH 5/5] RISC-V: Add EFI stub support."
Next in thread: Christoph Hellwig: "[PATCH 2/5] block: provide a blk_rq_map_sg variant that returns the last element"
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