linux-kernel - Re: [PATCH 5/6] xhci: Use device_iommu

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Date:   Mon, 17 Dec 2018 13:21:43 +0200
From:   Mathias Nyman <mathias.nyman@...ux.intel.com>
To:     Joerg Roedel <joro@...tes.org>, iommu@...ts.linux-foundation.org
Cc:     Russell Currey <ruscur@...sell.cc>,
        Sam Bobroff <sbobroff@...ux.ibm.com>, oohall@...il.com,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Hanjun Guo <hanjun.guo@...aro.org>,
        Sudeep Holla <sudeep.holla@....com>,
        Dan Williams <dan.j.williams@...el.com>,
        Vinod Koul <vkoul@...nel.org>, jroedel@...e.de,
        Mathias Nyman <mathias.nyman@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        dmaengine@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH 5/6] xhci: Use device_iommu_mapped()

On 11.12.2018 15:43, Joerg Roedel wrote:
> From: Joerg Roedel <jroedel@...e.de>
> 
> Replace the dev->iommu_group check with a proper function
> call that better reprensents its purpose.
> 
> Cc: Mathias Nyman <mathias.nyman@...el.com>
> Acked-by: Robin Murphy <robin.murphy@....com>
> Signed-off-by: Joerg Roedel <jroedel@...e.de>
> ---
>   drivers/usb/host/xhci.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
> index dae3be1b9c8f..8eacd2ed412b 100644
> --- a/drivers/usb/host/xhci.c
> +++ b/drivers/usb/host/xhci.c
> @@ -244,7 +244,7 @@ static void xhci_zero_64b_regs(struct xhci_hcd *xhci)
>   	 * an iommu. Doing anything when there is no iommu is definitely
>   	 * unsafe...
>   	 */
> -	if (!(xhci->quirks & XHCI_ZERO_64B_REGS) || !dev->iommu_group)
> +	if (!(xhci->quirks & XHCI_ZERO_64B_REGS) || !device_iommu_mapped(dev))
>   		return;
>   
>   	xhci_info(xhci, "Zeroing 64bit base registers, expecting fault\n");
> 

Acked-by: Mathias Nyman <mathias.nyman@...ux.intel.com>