[PATCH 10/10] iommu/amd: make amd_iommu_devtable_lock a spin_lock

Before commit 0bb6e243d7fb ("iommu/amd: Support IOMMU_DOMAIN_DMA type allocation") amd_iommu_devtable_lock had a read_lock() user but now there are none. In fact, after the mentioned commit we had only write_lock() user of the lock. Since there is no reason to keep it as writer lock, change its typ

[PATCH 10/10] iommu/amd: make amd_iommu_devtable_lock a spin_lock

Before commit 0bb6e243d7fb ("iommu/amd: Support IOMMU_DOMAIN_DMA type allocation") amd_iommu_devtable_lock had a read_lock() user but now there are none. In fact, after the mentioned commit we had only write_lock() user of the lock. Since there is no reason to keep it as writer lock, change its typ