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From: "Estrin, Alex" <alex.estrin@intel.com>
To: Bart Van Assche <Bart.VanAssche@sandisk.com>,
        "dledford@redhat.com" <dledford@redhat.com>
CC: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-rdma@vger.kernel.org" <linux-rdma@vger.kernel.org>,
        "gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>
Subject: RE: [PATCH v2 00/26] IB: Optimize DMA mapping
Thread-Topic: [PATCH v2 00/26] IB: Optimize DMA mapping
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Date: Fri, 13 Jan 2017 21:08:46 +0000
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> 
> Hello Alex,
> 
> Sorry for this. Can you check whether the patch below fixes this regression?
> 
> diff --git a/drivers/infiniband/sw/rdmavt/vt.c
> b/drivers/infiniband/sw/rdmavt/vt.c
> index 6a81b179f631..f7fcd015ec09 100644
> --- a/drivers/infiniband/sw/rdmavt/vt.c
> +++ b/drivers/infiniband/sw/rdmavt/vt.c
> @@ -778,8 +778,7 @@ int rvt_register_device(struct rvt_dev_info *rdi)
>  	}
> 
>  	/* DMA Operations */
> -	if (rdi->ibdev.dma_device->dma_ops == NULL)
> -		set_dma_ops(rdi->ibdev.dma_device, &dma_virt_ops);
> +	set_dma_ops(rdi->ibdev.dma_device, &dma_virt_ops);
> 
>  	/* Protection Domain */
>  	spin_lock_init(&rdi->n_pds_lock);
> --
> 2.11.0
> 
> I will make sure that this series applies cleanly on top of v4.10-rc3 when I
> repost it.
> 
> Bart.

Hi Bart,
It didn't fix the failure... Apparently there is an issue with generic mapping itself. 
Thanks,
Alex.