linux-kernel - [PATCH 19/29] iommu: exynos: remove useless spinlock

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Message-id: <1407235677-26324-20-git-send-email-m.szyprowski@samsung.com>
Date:	Tue, 05 Aug 2014 12:47:47 +0200
From:	Marek Szyprowski <m.szyprowski@...sung.com>
To:	iommu@...ts.linux-foundation.org,
	linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:	Marek Szyprowski <m.szyprowski@...sung.com>,
	linaro-mm-sig@...ts.linaro.org, Arnd Bergmann <arnd@...db.de>,
	Shaik Ameer Basha <shaik.ameer@...sung.com>,
	Cho KyongHo <pullip.cho@...sung.com>,
	Joerg Roedel <joro@...tes.org>,
	Thierry Reding <treding@...dia.com>,
	Olof Johansson <olof@...om.net>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Rob Herring <robh@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Inki Dae <inki.dae@...sung.com>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	Tomasz Figa <tomasz.figa@...il.com>,
	Kyungmin Park <kyungmin.park@...sung.com>
Subject: [PATCH 19/29] iommu: exynos: remove useless spinlock

This patch removes useless spinlocks and other unused members from
struct exynos_iommu_owner. There is no point is protecting this
structure by spinlock because content of this structure doesn't change
and other structures have their own spinlocks.

Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
---
 drivers/iommu/exynos-iommu.c | 11 -----------
 1 file changed, 11 deletions(-)

diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index ec3c882..ed8c518 100644
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -190,9 +190,6 @@ struct exynos_iommu_owner {
 	struct list_head client; /* entry of exynos_iommu_domain.clients */
 	struct device *dev;
 	struct device *sysmmu;
-	struct iommu_domain *domain;
-	void *vmm_data;         /* IO virtual memory manager's data */
-	spinlock_t lock;        /* Lock to preserve consistency of System MMU */
 };
 
 struct exynos_iommu_domain {
@@ -478,16 +475,12 @@ static int __exynos_sysmmu_enable(struct device *dev, phys_addr_t pgtable,
 
 	BUG_ON(!has_sysmmu(dev));
 
-	spin_lock_irqsave(&owner->lock, flags);
-
 	data = dev_get_drvdata(owner->sysmmu);
 
 	ret = __sysmmu_enable(data, pgtable, domain);
 	if (ret >= 0)
 		data->master = dev;
 
-	spin_unlock_irqrestore(&owner->lock, flags);
-
 	return ret;
 }
 
@@ -500,16 +493,12 @@ static bool exynos_sysmmu_disable(struct device *dev)
 
 	BUG_ON(!has_sysmmu(dev));
 
-	spin_lock_irqsave(&owner->lock, flags);
-
 	data = dev_get_drvdata(owner->sysmmu);
 
 	disabled = __sysmmu_disable(data);
 	if (disabled)
 		data->master = NULL;
 
-	spin_unlock_irqrestore(&owner->lock, flags);
-
 	return disabled;
 }
 
-- 
1.9.2

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