diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2011-07-19 17:02:07 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2011-09-13 11:12:20 +0200 |
| commit | 3b8f40481513a7b6123def5a02db4cff96ae2198 (patch) | |
| tree | b183c44200f644f5f84484aa7603924815b7adbb /drivers/iommu | |
| parent | 96f8e98bfeba3efa82eca85343bc058f6eced888 (diff) | |
| download | op-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.c | 14 |
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); |
