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Date: Wed, 26 Dec 2012 10:53:42 +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>
Subject: [PATCH v6 04/12] iommu/exynos: change rwlock to spinlock
Since acquiring read_lock is not more frequent than write_lock, it is
not beneficial to use rwlock, this commit changes rwlock to spinlock.
Signed-off-by: KyongHo Cho <pullip.cho@...sung.com>
---
drivers/iommu/exynos-iommu.c | 28 ++++++++++++++--------------
1 file changed, 14 insertions(+), 14 deletions(-)
diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index 58d2a24..5847508 100644
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -166,7 +166,7 @@ struct sysmmu_drvdata {
void __iomem **sfrbases;
struct clk *clk[2];
int activations;
- rwlock_t lock;
+ spinlock_t lock;
struct iommu_domain *domain;
unsigned long pgtable;
};
@@ -249,7 +249,7 @@ void exynos_sysmmu_set_prefbuf(struct device *dev,
BUG_ON((base0 + size0) <= base0);
BUG_ON((size1 > 0) && ((base1 + size1) <= base1));
- read_lock_irqsave(&data->lock, flags);
+ spin_lock_irqsave(&data->lock, flags);
if (!is_sysmmu_active(data))
goto finish;
@@ -279,7 +279,7 @@ void exynos_sysmmu_set_prefbuf(struct device *dev,
}
}
finish:
- read_unlock_irqrestore(&data->lock, flags);
+ spin_unlock_irqrestore(&data->lock, flags);
}
static void __show_fault_information(unsigned long *pgtable, unsigned long iova,
@@ -312,7 +312,7 @@ static irqreturn_t exynos_sysmmu_irq(int irq, void *dev_id)
int i, ret = -ENOSYS;
- read_lock(&data->lock);
+ spin_lock(&data->lock);
WARN_ON(!is_sysmmu_active(data));
@@ -354,7 +354,7 @@ static irqreturn_t exynos_sysmmu_irq(int irq, void *dev_id)
sysmmu_unblock(data->sfrbases[i]);
- read_unlock(&data->lock);
+ spin_unlock(&data->lock);
return IRQ_HANDLED;
}
@@ -365,7 +365,7 @@ static bool __exynos_sysmmu_disable(struct sysmmu_drvdata *data)
bool disabled = false;
int i;
- write_lock_irqsave(&data->lock, flags);
+ spin_lock_irqsave(&data->lock, flags);
if (!set_sysmmu_inactive(data))
goto finish;
@@ -382,7 +382,7 @@ static bool __exynos_sysmmu_disable(struct sysmmu_drvdata *data)
data->pgtable = 0;
data->domain = NULL;
finish:
- write_unlock_irqrestore(&data->lock, flags);
+ spin_unlock_irqrestore(&data->lock, flags);
if (disabled)
dev_dbg(data->sysmmu, "(%s) Disabled\n", data->dbgname);
@@ -405,7 +405,7 @@ static int __exynos_sysmmu_enable(struct sysmmu_drvdata *data,
int i, ret = 0;
unsigned long flags;
- write_lock_irqsave(&data->lock, flags);
+ spin_lock_irqsave(&data->lock, flags);
if (!set_sysmmu_active(data)) {
if (WARN_ON(pgtable != data->pgtable)) {
@@ -444,7 +444,7 @@ static int __exynos_sysmmu_enable(struct sysmmu_drvdata *data,
dev_dbg(data->sysmmu, "(%s) Enabled\n", data->dbgname);
finish:
- write_unlock_irqrestore(&data->lock, flags);
+ spin_unlock_irqrestore(&data->lock, flags);
return ret;
}
@@ -491,7 +491,7 @@ static void sysmmu_tlb_invalidate_entry(struct device *dev, unsigned long iova)
unsigned long flags;
struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu);
- read_lock_irqsave(&data->lock, flags);
+ spin_lock_irqsave(&data->lock, flags);
if (is_sysmmu_active(data)) {
int i;
@@ -508,7 +508,7 @@ static void sysmmu_tlb_invalidate_entry(struct device *dev, unsigned long iova)
data->dbgname);
}
- read_unlock_irqrestore(&data->lock, flags);
+ spin_unlock_irqrestore(&data->lock, flags);
}
void exynos_sysmmu_tlb_invalidate(struct device *dev)
@@ -516,7 +516,7 @@ void exynos_sysmmu_tlb_invalidate(struct device *dev)
unsigned long flags;
struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu);
- read_lock_irqsave(&data->lock, flags);
+ spin_lock_irqsave(&data->lock, flags);
if (is_sysmmu_active(data)) {
int i;
@@ -532,7 +532,7 @@ void exynos_sysmmu_tlb_invalidate(struct device *dev)
data->dbgname);
}
- read_unlock_irqrestore(&data->lock, flags);
+ spin_unlock_irqrestore(&data->lock, flags);
}
static int exynos_sysmmu_probe(struct platform_device *pdev)
@@ -629,7 +629,7 @@ static int exynos_sysmmu_probe(struct platform_device *pdev)
}
data->sysmmu = dev;
- rwlock_init(&data->lock);
+ spin_lock_init(&data->lock);
INIT_LIST_HEAD(&data->node);
if (dev->parent)
--
1.8.0
--
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