fix ATAPI support for libsas drivers

To: martin.petersen@xxxxxxxxxx
Subject: fix ATAPI support for libsas drivers
From: Christoph Hellwig <hch@xxxxxx>
Date: Mon, 15 Jun 2020 08:46:22 +0200
Cc: brking@xxxxxxxxxx, jinpu.wang@xxxxxxxxxxxxxxx, John Garry <john.garry@xxxxxxxxxx>, mpe@xxxxxxxxxxxxxx, linux-scsi@xxxxxxxxxxxxxxx, linux-ide@xxxxxxxxxxxxxxx

Hi all,

this series fixes the ATAPI DMA drain refactoring for SAS HBAs that
use libsas.

Follow-Ups:
- Re: fix ATAPI support for libsas drivers
  - From: John Garry
- [PATCH 1/2] libata: provide a ata_scsi_dma_need_drain stub for !CONFIG_ATA
  - From: Christoph Hellwig
- [PATCH 2/2] scsi: wire up ata_scsi_dma_need_drain for SAS HBA drivers
  - From: Christoph Hellwig