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

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Message-id: <004201ce89f3$9b849a20$d28dce60$@samsung.com>
Date:	Fri, 26 Jul 2013 20:31:01 +0900
From:	Cho KyongHo <pullip.cho@...sung.com>
To:	'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>
Cc:	'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: [PATCH v8 12/12] iommu/exynos: return 0 if iommu_attach_device()
 successes

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>
---
 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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