[PATCH AUTOSEL for 4.15 62/78] iommu/vt-d: clean up pr_irq if request_threaded_irq fails

From: Jerry Snitselaar [ Upstream commit 72d548113881dd32bf7f0b221d031e6586468437 ] It is unlikely request_threaded_irq will fail, but if it does for some reason we should clear iommu->pr_irq in the error path. Also intel_svm_finish_prq shouldn't try to clean up the page

[PATCH AUTOSEL for 4.15 62/78] iommu/vt-d: clean up pr_irq if request_threaded_irq fails

From: Jerry Snitselaar [ Upstream commit 72d548113881dd32bf7f0b221d031e6586468437 ] It is unlikely request_threaded_irq will fail, but if it does for some reason we should clear iommu->pr_irq in the error path. Also intel_svm_finish_prq shouldn't try to clean up the page request interrupt if