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Subject[PATCH] iommu/vt-d: only attempt to cleanup svm page request irq if one assigned
Date
Only try to clean up the svm page request irq if one has
been assigned. Also clear pr_irq in the error path if irq request
fails.

Signed-off-by: Jerry Snitselaar <jsnitsel@redhat.com>
---
drivers/iommu/intel-svm.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c
index f6697e55c2d4..003b4a4d4b78 100644
--- a/drivers/iommu/intel-svm.c
+++ b/drivers/iommu/intel-svm.c
@@ -129,6 +129,7 @@ int intel_svm_enable_prq(struct intel_iommu *iommu)
pr_err("IOMMU: %s: Failed to request IRQ for page request queue\n",
iommu->name);
dmar_free_hwirq(irq);
+ iommu->pr_irq = 0;
goto err;
}
dmar_writeq(iommu->reg + DMAR_PQH_REG, 0ULL);
@@ -144,9 +145,11 @@ int intel_svm_finish_prq(struct intel_iommu *iommu)
dmar_writeq(iommu->reg + DMAR_PQT_REG, 0ULL);
dmar_writeq(iommu->reg + DMAR_PQA_REG, 0ULL);

- free_irq(iommu->pr_irq, iommu);
- dmar_free_hwirq(iommu->pr_irq);
- iommu->pr_irq = 0;
+ if (iommu->pr_irq) {
+ free_irq(iommu->pr_irq, iommu);
+ dmar_free_hwirq(iommu->pr_irq);
+ iommu->pr_irq = 0;
+ }

free_pages((unsigned long)iommu->prq, PRQ_ORDER);
iommu->prq = NULL;
--
2.13.0.rc0.45.ge2cb6ab84
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