linux-kernel - Re: [PATCH 2/2] iommu/tegra-gart: Add support for struct iommu

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Date:   Thu, 17 Aug 2017 01:21:52 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Joerg Roedel <joro@...tes.org>, Hiroshi Doyu <hdoyu@...dia.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>
Cc:     Robin Murphy <robin.murphy@....com>,
        iommu@...ts.linux-foundation.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org, Joerg Roedel <jroedel@...e.de>
Subject: Re: [PATCH 2/2] iommu/tegra-gart: Add support for struct iommu_device

Hello Joerg,

On 10.08.2017 01:29, Joerg Roedel wrote:
> From: Joerg Roedel <jroedel@...e.de>
> 
> Add a struct iommu_device to each tegra-gart and register it
> with the iommu-core. Also link devices added to the driver
> to their respective hardware iommus.
> 
> Signed-off-by: Joerg Roedel <jroedel@...e.de>
> ---
>  drivers/iommu/tegra-gart.c | 26 ++++++++++++++++++++++++++
>  1 file changed, 26 insertions(+)
> 

Reviewed-by: Dmitry Osipenko <digetx@...il.com>
Tested-by: Dmitry Osipenko <digetx@...il.com>

> diff --git a/drivers/iommu/tegra-gart.c b/drivers/iommu/tegra-gart.c
> index 29bafc6..b62f790 100644
> --- a/drivers/iommu/tegra-gart.c
> +++ b/drivers/iommu/tegra-gart.c

[snip]

> @@ -449,6 +472,9 @@ static int tegra_gart_remove(struct platform_device *pdev)
>  {

BTW, GART's driver can't be build as a module, so this function is pretty much a
dead code. Probably worth considering its removal.

>  	struct gart_device *gart = platform_get_drvdata(pdev);
>  
> +	iommu_device_unregister(&gart->iommu);
> +	iommu_device_sysfs_remove(&gart->iommu);
> +
>  	writel(0, gart->regs + GART_CONFIG);
>  	if (gart->savedata)
>  		vfree(gart->savedata);
> 


-- 
Dmitry