locking, x86, iommu: Annotate qi->q_lock as raw

The qi->q_lock lock can be taken in atomic context and therefore
cannot 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, 7 insertions, 7 deletions

diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
index be4164b3ebe8..388a1189e552 100644
--- a/drivers/iommu/dmar.c
+++ b/drivers/iommu/dmar.c
@@ -921,11 +921,11 @@ int qi_submit_sync(struct qi_desc *desc, struct intel_iommu *iommu)
 restart:
         rc = 0;
 
-        spin_lock_irqsave(&qi->q_lock, flags);
+        raw_spin_lock_irqsave(&qi->q_lock, flags);
         while (qi->free_cnt < 3) {
-                spin_unlock_irqrestore(&qi->q_lock, flags);
+                raw_spin_unlock_irqrestore(&qi->q_lock, flags);
                 cpu_relax();
-                spin_lock_irqsave(&qi->q_lock, flags);
+                raw_spin_lock_irqsave(&qi->q_lock, flags);
         }
 
         index = qi->free_head;
@@ -965,15 +965,15 @@ restart:
                 if (rc)
                         break;
 
-                spin_unlock(&qi->q_lock);
+                raw_spin_unlock(&qi->q_lock);
                 cpu_relax();
-                spin_lock(&qi->q_lock);
+                raw_spin_lock(&qi->q_lock);
         }
 
         qi->desc_status[index] = QI_DONE;
 
         reclaim_free_desc(qi);
-        spin_unlock_irqrestore(&qi->q_lock, flags);
+        raw_spin_unlock_irqrestore(&qi->q_lock, flags);
 
         if (rc == -EAGAIN)
                 goto restart;
@@ -1159,7 +1159,7 @@ int dmar_enable_qi(struct intel_iommu *iommu)
         qi->free_head = qi->free_tail = 0;
         qi->free_cnt = QI_LENGTH;
 
-        spin_lock_init(&qi->q_lock);
+        raw_spin_lock_init(&qi->q_lock);
 
         __dmar_enable_qi(iommu);