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authorThomas Gleixner <tglx@linutronix.de>2011-07-19 17:02:07 +0200
committerIngo Molnar <mingo@elte.hu>2011-09-13 11:12:20 +0200
commit3b8f40481513a7b6123def5a02db4cff96ae2198 (patch)
treeb183c44200f644f5f84484aa7603924815b7adbb /drivers/iommu
parent96f8e98bfeba3efa82eca85343bc058f6eced888 (diff)
downloadop-kernel-dev-3b8f40481513a7b6123def5a02db4cff96ae2198.zip
op-kernel-dev-3b8f40481513a7b6123def5a02db4cff96ae2198.tar.gz
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>
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/dmar.c14
1 files changed, 7 insertions, 7 deletions
diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
index be4164b..388a118 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);
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