linux-kernel - [PATCH 04/12] iommu/amd: WARN when __[attach|detach]

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Date:	Tue, 20 Oct 2015 17:33:37 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	iommu@...ts.linux-foundation.org
Cc:	linux-kernel@...r.kernel.org, Joerg Roedel <jroedel@...e.de>
Subject: [PATCH 04/12] iommu/amd: WARN when __[attach|detach]_device are called with irqs enabled

From: Joerg Roedel <jroedel@...e.de>

These functions rely on being called with IRQs disabled. Add
a WARN_ON to detect early when its not.

Signed-off-by: Joerg Roedel <jroedel@...e.de>
---
 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 54e0862..d47c4b1 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2039,6 +2039,12 @@ 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);
 
@@ -2199,6 +2205,12 @@ 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;
 
-- 
1.9.1

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