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authorLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>2013-12-17 17:18:50 (GMT)
committerJoerg Roedel <joro@8bytes.org>2014-01-07 14:35:25 (GMT)
commite87c621dced122a9a0a51b56944b08421d273c8f (patch)
tree66df432b82d2d7306d846d2e734ce65a823b5ab6 /drivers/iommu
parentdc89f797abdbfc58dfb28af944f80f0299a8fafa (diff)
downloadlinux-e87c621dced122a9a0a51b56944b08421d273c8f.tar.xz
iommu/shmobile: Turn the flush_lock mutex into a spinlock
The lock is taken in atomic context, replace it with a spinlock. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Signed-off-by: Joerg Roedel <joro@8bytes.org>
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/shmobile-ipmmu.c10
-rw-r--r--drivers/iommu/shmobile-ipmmu.h2
2 files changed, 6 insertions, 6 deletions
diff --git a/drivers/iommu/shmobile-ipmmu.c b/drivers/iommu/shmobile-ipmmu.c
index 8321f89..e3bc2e1 100644
--- a/drivers/iommu/shmobile-ipmmu.c
+++ b/drivers/iommu/shmobile-ipmmu.c
@@ -35,12 +35,12 @@ void ipmmu_tlb_flush(struct shmobile_ipmmu *ipmmu)
if (!ipmmu)
return;
- mutex_lock(&ipmmu->flush_lock);
+ spin_lock(&ipmmu->flush_lock);
if (ipmmu->tlb_enabled)
ipmmu_reg_write(ipmmu, IMCTR1, IMCTR1_FLUSH | IMCTR1_TLBEN);
else
ipmmu_reg_write(ipmmu, IMCTR1, IMCTR1_FLUSH);
- mutex_unlock(&ipmmu->flush_lock);
+ spin_unlock(&ipmmu->flush_lock);
}
void ipmmu_tlb_set(struct shmobile_ipmmu *ipmmu, unsigned long phys, int size,
@@ -49,7 +49,7 @@ void ipmmu_tlb_set(struct shmobile_ipmmu *ipmmu, unsigned long phys, int size,
if (!ipmmu)
return;
- mutex_lock(&ipmmu->flush_lock);
+ spin_lock(&ipmmu->flush_lock);
switch (size) {
default:
ipmmu->tlb_enabled = 0;
@@ -85,7 +85,7 @@ void ipmmu_tlb_set(struct shmobile_ipmmu *ipmmu, unsigned long phys, int size,
}
ipmmu_reg_write(ipmmu, IMTTBR, phys);
ipmmu_reg_write(ipmmu, IMASID, asid);
- mutex_unlock(&ipmmu->flush_lock);
+ spin_unlock(&ipmmu->flush_lock);
}
static int ipmmu_probe(struct platform_device *pdev)
@@ -104,7 +104,7 @@ static int ipmmu_probe(struct platform_device *pdev)
dev_err(&pdev->dev, "cannot allocate device data\n");
return -ENOMEM;
}
- mutex_init(&ipmmu->flush_lock);
+ spin_lock_init(&ipmmu->flush_lock);
ipmmu->dev = &pdev->dev;
ipmmu->ipmmu_base = devm_ioremap_nocache(&pdev->dev, res->start,
resource_size(res));
diff --git a/drivers/iommu/shmobile-ipmmu.h b/drivers/iommu/shmobile-ipmmu.h
index 4d53684..9524743 100644
--- a/drivers/iommu/shmobile-ipmmu.h
+++ b/drivers/iommu/shmobile-ipmmu.h
@@ -14,7 +14,7 @@ struct shmobile_ipmmu {
struct device *dev;
void __iomem *ipmmu_base;
int tlb_enabled;
- struct mutex flush_lock;
+ spinlock_t flush_lock;
const char * const *dev_names;
unsigned int num_dev_names;
};