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

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Date:   Wed, 10 Jun 2020 15:43:58 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Christoph Hellwig <hch@....de>
Cc:     brking@...ibm.com, Christoph Hellwig <hch@....de>,
        Jens Axboe <axboe@...nel.dk>, linux-scsi@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        linuxppc-dev@...ts.ozlabs.org, linux-block@...r.kernel.org,
        linux-ide@...r.kernel.org
Subject: Re: ipr crashes due to NULL dma_need_drain since cc97923a5bcc ("block: move dma drain handling to scsi")

Christoph Hellwig <hch@....de> writes:
> Can you try this patch?
>
> ---
> From 1c9913360a0494375c5655b133899cb4323bceb4 Mon Sep 17 00:00:00 2001
> From: Christoph Hellwig <hch@....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@...erman.id.au>
> Signed-off-by: Christoph Hellwig <hch@....de>

Yep that works for me here with ipr.

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

cheers