linux-kernel - [ 58/59] iommu/amd: Make sure IOMMU interrupts are re-enabled on resume

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Message-Id: <20120411231045.314749405@linuxfoundation.org>
Date:	Wed, 11 Apr 2012 16:11:33 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Joerg Roedel <joerg.roedel@....com>
Subject: [ 58/59] iommu/amd: Make sure IOMMU interrupts are re-enabled on resume

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Joerg Roedel <joerg.roedel@....com>

commit 9ddd592a191b32f2ee6c4b6ed2bd52665c3a49f5 upstream

Unfortunatly the interrupts for the event log and the
peripheral page-faults are only enabled at boot but not
re-enabled at resume. Fix that for 3.2.

Cc: stable@...r.kernel.org
Signed-off-by: Joerg Roedel <joerg.roedel@....com>
---
 drivers/iommu/amd_iommu_init.c |   24 +++++++++++++++++-------
 1 file changed, 17 insertions(+), 7 deletions(-)

--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -1033,8 +1033,9 @@ static int iommu_setup_msi(struct amd_io
 {
 	int r;
 
-	if (pci_enable_msi(iommu->dev))
-		return 1;
+	r = pci_enable_msi(iommu->dev);
+	if (r)
+		return r;
 
 	r = request_threaded_irq(iommu->dev->irq,
 				 amd_iommu_int_handler,
@@ -1044,24 +1045,33 @@ static int iommu_setup_msi(struct amd_io
 
 	if (r) {
 		pci_disable_msi(iommu->dev);
-		return 1;
+		return r;
 	}
 
 	iommu->int_enabled = true;
-	iommu_feature_enable(iommu, CONTROL_EVT_INT_EN);
 
 	return 0;
 }
 
 static int iommu_init_msi(struct amd_iommu *iommu)
 {
+	int ret;
+
 	if (iommu->int_enabled)
-		return 0;
+		goto enable_faults;
 
 	if (pci_find_capability(iommu->dev, PCI_CAP_ID_MSI))
-		return iommu_setup_msi(iommu);
+		ret = iommu_setup_msi(iommu);
+	else
+		ret = -ENODEV;
+
+	if (ret)
+		return ret;
 
-	return 1;
+enable_faults:
+	iommu_feature_enable(iommu, CONTROL_EVT_INT_EN);
+
+	return 0;
 }
 
 /****************************************************************************


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