Re: ipr crashes due to NULL dma_need_drain since cc97923a5bcc ("block: move dma drain handling to scsi")

Christoph Hellwig [off-list ref] writes:

Can you try this patch?

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From 1c9913360a0494375c5655b133899cb4323bceb4 Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@lst.de>
Date: Tue, 9 Jun 2020 14:07:31 +0200
Subject: scsi: wire up ata_scsi_dma_need_drain for SAS HBA drivers

We need ata_scsi_dma_need_drain for all drivers wired up to drive ATAPI
devices through libata.  That also includes the SAS HBA drivers in
addition to native libata HBA drivers.

Fixes: cc97923a5bcc ("block: move dma drain handling to scsi")
Reported-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Christoph Hellwig <hch@lst.de>

Yep that works for me here with ipr.

Tested-by: Michael Ellerman <mpe@ellerman.id.au>

cheers