linux-kernel - [PATCH 3.15 088/122] iommu/vt-d: fix bug in handling multiple RMRRs for the same PCI device

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Message-Id: <20140707235736.895820719@linuxfoundation.org>
Date:	Mon,  7 Jul 2014 16:57:30 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Tom Mingarelli <thomas.mingarelli@...com>,
	Linda Knippers <linda.knippers@...com>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	Joerg Roedel <jroedel@...e.de>
Subject: [PATCH 3.15 088/122] iommu/vt-d: fix bug in handling multiple RMRRs for the same PCI device

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

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

From: Jiang Liu <jiang.liu@...ux.intel.com>

commit 27e249501ca06a3010519c306206cc402b61b5ab upstream.

Function dmar_iommu_notify_scope_dev() makes a wrong assumption that
there's one RMRR for each PCI device at most, which causes DMA failure
on some HP platforms. So enhance dmar_iommu_notify_scope_dev() to
handle multiple RMRRs for the same PCI device.

Fixbug: https://bugzilla.novell.com/show_bug.cgi?id=879482

Reported-by: Tom Mingarelli <thomas.mingarelli@...com>
Tested-by: Linda Knippers <linda.knippers@...com>
Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/iommu/intel-iommu.c |    9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -3799,14 +3799,11 @@ int dmar_iommu_notify_scope_dev(struct d
 				((void *)rmrr) + rmrr->header.length,
 				rmrr->segment, rmrru->devices,
 				rmrru->devices_cnt);
-			if (ret > 0)
-				break;
-			else if(ret < 0)
+			if(ret < 0)
 				return ret;
 		} else if (info->event == BUS_NOTIFY_DEL_DEVICE) {
-			if (dmar_remove_dev_scope(info, rmrr->segment,
-				rmrru->devices, rmrru->devices_cnt))
-				break;
+			dmar_remove_dev_scope(info, rmrr->segment,
+				rmrru->devices, rmrru->devices_cnt);
 		}
 	}
 


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