linux-kernel - Re: [PATCH 3/4] iommu/exynos: Add iommu driver for Exynos4 Platforms

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Date:	Tue, 27 Sep 2011 18:01:00 +0900
From:	KyongHo Cho <pullip.cho@...sung.com>
To:	Ohad Ben-Cohen <ohad@...ery.com>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"joerg.roedel@....com" <joerg.roedel@....com>,
	이상현 <sanghyun75.lee@...sung.com>,
	김국진 <kgene.kim@...sung.com>,
	김영락 <younglak1004.kim@...sung.com>
Subject: Re: [PATCH 3/4] iommu/exynos: Add iommu driver for Exynos4 Platforms

On Tue, Sep 27, 2011 at 5:48 PM, Ohad Ben-Cohen <ohad@...ery.com> wrote:
> diff --git a/include/linux/iommu.h b/include/linux/iommu.h
> index d084e87..2987199 100644
> --- a/include/linux/iommu.h
> +++ b/include/linux/iommu.h
> @@ -98,11 +98,12 @@ extern void iommu_set_fault_handler(struct
> iommu_domain *domain,
>  * Returns 0 on success and an appropriate error code otherwise (if dynamic
>  * PTE/TLB loading will one day be supported, implementations will be able
>  * to tell whether it succeeded or not according to this return value).
> + * If a fault handler isn't installed, -ENOSYS is returned.
>  */
>  static inline int report_iommu_fault(struct iommu_domain *domain,
>                struct device *dev, unsigned long iova, int flags)
>  {
> -       int ret = 0;
> +       int ret = -ENOSYS;
>
>        /*
>         * if upper layers showed interest and installed a fault handler,
It looks good for me.

I will prepare new patches with the changed API.

Thank you.
Cho KyongHo.
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