[Patch Part3 V4 09/21] iommu/vt-d: Change iommu_enable/disable_translation to return void

Jiang Liu
2014-07-11T06:17:28Z

Simplify error handling path by changing iommu_{enable|disable}_translation
to return void.

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
---
drivers/iommu/intel-iommu.c | 18 +++++-------------
1 file changed, 5 insertions(+), 13 deletions(-)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 5d7383775bf1..0ba078bc0f32 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -1389,7 +1389,7 @@ static void iommu_disable_protect_mem_regions(struct intel_iommu *iommu)
raw_spin_unlock_irqrestore(&iommu->register_lock, flags);
}

-static int iommu_enable_translation(struct intel_iommu *iommu)
+static void iommu_enable_translation(struct intel_iommu *iommu)
{
u32 sts;
unsigned long flags;
@@ -1403,10 +1403,9 @@ static int iommu_enable_translation(struct intel_iommu *iommu)
readl, (sts & DMA_GSTS_TES), sts);

raw_spin_unlock_irqrestore(&iommu->register_lock, flags);
- return 0;
}

-static int iommu_disable_translation(struct intel_iommu *iommu)
+static void iommu_disable_translation(struct intel_iommu *iommu)
{
u32 sts;
unsigned long flag;
@@ -1420,7 +1419,6 @@ static int iommu_disable_translation(struct intel_iommu *iommu)
readl, (!(sts & DMA_GSTS_TES)), sts);

raw_spin_unlock_irqrestore(&iommu->register_lock, flag);
- return 0;
}

@@ -2860,11 +2858,7 @@ static int __init init_dmars(void)

iommu->flush.flush_context(iommu, 0, 0, 0, DMA_CCMD_GLOBAL_INVL);
iommu->flush.flush_iotlb(iommu, 0, 0, 0, DMA_TLB_GLOBAL_FLUSH);
-
- ret = iommu_enable_translation(iommu);
- if (ret)
- goto free_iommu;
-
+ iommu_enable_translation(iommu);
iommu_disable_protect_mem_regions(iommu);
}

@@ -3578,10 +3572,8 @@ static int init_iommu_hw(void)

iommu->flush.flush_context(iommu, 0, 0, 0,
DMA_CCMD_GLOBAL_INVL);
- iommu->flush.flush_iotlb(iommu, 0, 0, 0,
- DMA_TLB_GLOBAL_FLUSH);
- if (iommu_enable_translation(iommu))
- return 1;
+ iommu->flush.flush_iotlb(iommu, 0, 0, 0, DMA_TLB_GLOBAL_FLUSH);
+ iommu_enable_translation(iommu);
iommu_disable_protect_mem_regions(iommu);
}

--
1.7.10.4