locking, x86, iommu: Annotate iommu->register_lock as raw

The iommu->register_lock can be taken in atomic context and therefore
must not be preempted on -rt - annotate it.

In mainline this change documents the low level nature of
the lock - otherwise there's no functional difference. Lockdep
and Sparse checking will work as usual.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 6 insertions, 6 deletions

diff --git a/drivers/iommu/intr_remapping.c b/drivers/iommu/intr_remapping.c
index 1a89d4a2cadf..b2443f1a13ef 100644
--- a/drivers/iommu/intr_remapping.c
+++ b/drivers/iommu/intr_remapping.c
@@ -409,7 +409,7 @@ static void iommu_set_intr_remapping(struct intel_iommu *iommu, int mode)
 
         addr = virt_to_phys((void *)iommu->ir_table->base);
 
-        spin_lock_irqsave(&iommu->register_lock, flags);
+        raw_spin_lock_irqsave(&iommu->register_lock, flags);
 
         dmar_writeq(iommu->reg + DMAR_IRTA_REG,
                     (addr) | IR_X2APIC_MODE(mode) | INTR_REMAP_TABLE_REG_SIZE);
@@ -420,7 +420,7 @@ static void iommu_set_intr_remapping(struct intel_iommu *iommu, int mode)
 
         IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG,
                       readl, (sts & DMA_GSTS_IRTPS), sts);
-        spin_unlock_irqrestore(&iommu->register_lock, flags);
+        raw_spin_unlock_irqrestore(&iommu->register_lock, flags);
 
         /*
          * global invalidation of interrupt entry cache before enabling
@@ -428,7 +428,7 @@ static void iommu_set_intr_remapping(struct intel_iommu *iommu, int mode)
          */
         qi_global_iec(iommu);
 
-        spin_lock_irqsave(&iommu->register_lock, flags);
+        raw_spin_lock_irqsave(&iommu->register_lock, flags);
 
         /* Enable interrupt-remapping */
         iommu->gcmd |= DMA_GCMD_IRE;
@@ -437,7 +437,7 @@ static void iommu_set_intr_remapping(struct intel_iommu *iommu, int mode)
         IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG,
                       readl, (sts & DMA_GSTS_IRES), sts);
 
-        spin_unlock_irqrestore(&iommu->register_lock, flags);
+        raw_spin_unlock_irqrestore(&iommu->register_lock, flags);
 }
 
 
@@ -485,7 +485,7 @@ static void iommu_disable_intr_remapping(struct intel_iommu *iommu)
          */
         qi_global_iec(iommu);
 
-        spin_lock_irqsave(&iommu->register_lock, flags);
+        raw_spin_lock_irqsave(&iommu->register_lock, flags);
 
         sts = dmar_readq(iommu->reg + DMAR_GSTS_REG);
         if (!(sts & DMA_GSTS_IRES))
@@ -498,7 +498,7 @@ static void iommu_disable_intr_remapping(struct intel_iommu *iommu)
                       readl, !(sts & DMA_GSTS_IRES), sts);
 
 end:
-        spin_unlock_irqrestore(&iommu->register_lock, flags);
+        raw_spin_unlock_irqrestore(&iommu->register_lock, flags);
 }
 
 int __init intr_remapping_supported(void)