iommu/vt-d: Change iommu_enable/disable_translation to return void

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

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 5d73837..0ba078b 100644 (file)
--- 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);
        }