From mboxrd@z Thu Jan  1 00:00:00 1970
From: Joerg Roedel <jroedel@suse.de>
Subject: Re: [PATCH 4/4] s390/virtio: use noop dma ops
Date: Wed, 28 Oct 2015 09:43:34 +0900
Message-ID: <20151028004334.GD2805@suse.de>
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To: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Andy Lutomirski <luto@kernel.org>, Cornelia Huck <cornelia.huck@de.ibm.com>, Sebastian Ott <sebott@linux.vnet.ibm.com>, Paolo Bonzini <pbonzini@redhat.com>, Christoph Hellwig <hch@lst.de>, benh@kernel.crashing.org, KVM <kvm@vger.kernel.org>, dwmw2@infradead.org, Martin Schwidefsky <schwidefsky@de.ibm.com>, linux-s390 <linux-s390@vger.kernel.org>
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On Tue, Oct 27, 2015 at 11:48:51PM +0100, Christian Borntraeger wrote:
> @@ -1093,6 +1094,7 @@ static void virtio_ccw_auto_online(void *data, async_cookie_t cookie)
>  	struct ccw_device *cdev = data;
>  	int ret;
>  
> +	cdev->dev.archdata.dma_ops = &dma_noop_ops;
>  	ret = ccw_device_set_online(cdev);
>  	if (ret)
>  		dev_warn(&cdev->dev, "Failed to set online: %d\n", ret);

Hmm, drivers usually don't deal with setting the dma_ops for their
devices, as they depend on the platform and not so much on the device
itself.

Can you do this special-case handling from device independent platform
code, where you also setup dma_ops for other devices?


	Joerg