linux-kernel - Re: [PATCH v8 12/12] iommu/exynos: return 0 if iommu_attach

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Date:	Fri, 26 Jul 2013 10:23:54 -0700
From:	Grant Grundler <grundler@...omium.org>
To:	Cho KyongHo <pullip.cho@...sung.com>
Cc:	Linux ARM Kernel <linux-arm-kernel@...ts.infradead.org>,
	Linux IOMMU <iommu@...ts.linux-foundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linux Samsung SOC <linux-samsung-soc@...r.kernel.org>,
	Hyunwoong Kim <khw0178.kim@...sung.com>,
	Joerg Roedel <joro@...tes.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Prathyush <prathyush.k@...sung.com>,
	Rahul Sharma <rahul.sharma@...sung.com>,
	Subash Patel <supash.ramaswamy@...aro.org>,
	Keyyoung Park <keyyoung.park@...sung.com>,
	Grant Grundler <grundler@...omium.org>,
	Antonios Motakis <a.motakis@...tualopensystems.com>,
	kvmarm@...ts.cs.columbia.edu,
	Sachin Kamat <sachin.kamat@...aro.org>
Subject: Re: [PATCH v8 12/12] iommu/exynos: return 0 if iommu_attach_device() successes

On Fri, Jul 26, 2013 at 4:31 AM, Cho KyongHo <pullip.cho@...sung.com> wrote:
> iommu_attach_device() against exynos-iommu positive integer on success
> if the caller calls iommu_attach_device() with the same iommu_domain
> multiple times without call to iommu_detach_device() to inform the
> caller how many calls to iommu_detach_device() to really detach iommu.
>
> However the convention of the return value of success of common API is
> zero, this patch makes iommu_attach_device() call against exynos-iommu
> always return zero if the given device is successfully attached to
> the given iommu_domain even though it is already attached to the same
> iommu_domain.
>
> Signed-off-by: Cho KyongHo <pullip.cho@...sung.com>

Reviewed-by: Grant Grundler <grundler@...omium.org>

cheers,
grant

> ---
>  drivers/iommu/exynos-iommu.c |   13 +++++++------
>  1 files changed, 7 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
> index 51e5b35..6eed6d6 100644
> --- a/drivers/iommu/exynos-iommu.c
> +++ b/drivers/iommu/exynos-iommu.c
> @@ -882,15 +882,16 @@ static int exynos_iommu_attach_device(struct iommu_domain *domain,
>
>         spin_unlock_irqrestore(&priv->lock, flags);
>
> -       if (ret < 0)
> +       if (ret < 0) {
>                 dev_err(dev, "%s: Failed to attach IOMMU with pgtable %#lx\n",
>                                 __func__, __pa(priv->pgtable));
> -       else
> -               dev_dbg(dev, "%s: Attached IOMMU with pgtable 0x%lx%s\n",
> -                                       __func__, __pa(priv->pgtable),
> -                                       (ret == 0) ? "" : ", again");
> +               return ret;
> +       }
>
> -       return ret;
> +       dev_dbg(dev, "%s: Attached IOMMU with pgtable 0x%lx%s\n",
> +               __func__, __pa(priv->pgtable), (ret == 0) ? "" : ", again");
> +
> +       return 0;
>  }
>
>  static void exynos_iommu_detach_device(struct iommu_domain *domain,
> --
> 1.7.2.5
>
>
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