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iommu/amd: Use raw locks on atomic context paths

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Several functions in this driver are called from atomic context,
and thus raw locks must be used in order to be safe on PREEMPT_RT.

This includes paths that must wait for command completion, which is
a potential PREEMPT_RT latency concern but not easily avoidable.

Signed-off-by: Scott Wood <swood@redhat.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Scott Wood
2018-01-21 03:28:54 -06:00
committed by Joerg Roedel
parent 7928b2cbe5
commit 27790398c2
3 changed files with 18 additions and 18 deletions
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2
drivers/iommu/amd_iommu_init.c
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@@ -1474,7 +1474,7 @@ static int __init init_iommu_one(struct amd_iommu *iommu, struct ivhd_header *h)
{
int ret;
spin_lock_init(&iommu->lock);
raw_spin_lock_init(&iommu->lock);
/* Add IOMMU to internal data structures */
list_add_tail(&iommu->list, &amd_iommu_list);