From 272e4f99e966989394b167b695ab489c60fe1243 Mon Sep 17 00:00:00 2001 From: Joerg Roedel Date: Tue, 20 Oct 2015 17:33:37 +0200 Subject: [PATCH] iommu/amd: WARN when __[attach|detach]_device are called with irqs enabled These functions rely on being called with IRQs disabled. Add a WARN_ON to detect early when its not. Signed-off-by: Joerg Roedel --- drivers/iommu/amd_iommu.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c index 07f491c2dc64..f8f54a4b1d8f 100644 --- a/drivers/iommu/amd_iommu.c +++ b/drivers/iommu/amd_iommu.c @@ -2030,6 +2030,12 @@ static int __attach_device(struct iommu_dev_data *dev_data, { int ret; + /* + * Must be called with IRQs disabled. Warn here to detect early + * when its not. + */ + WARN_ON(!irqs_disabled()); + /* lock domain */ spin_lock(&domain->lock); @@ -2190,6 +2196,12 @@ static void __detach_device(struct iommu_dev_data *dev_data) { struct protection_domain *domain; + /* + * Must be called with IRQs disabled. Warn here to detect early + * when its not. + */ + WARN_ON(!irqs_disabled()); + if (WARN_ON(!dev_data->domain)) return; -- 2.20.1