linux-kernel - [PATCH 3.4 10/45] iommu/amd: Fix cleanup

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Date:	Tue, 23 Sep 2014 10:31:12 +0800
From:	Zefan Li <lizf@...nel.org>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Joerg Roedel <jroedel@...e.de>,
	Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 10/45] iommu/amd: Fix cleanup_domain for mass device removal

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

3.4.104-rc1 review patch.  If anyone has any objections, please let me know.

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

commit 9b29d3c6510407d91786c1cf9183ff4debb3473a upstream.

When multiple devices are detached in __detach_device, they
are also removed from the domains dev_list. This makes it
unsafe to use list_for_each_entry_safe, as the next pointer
might also not be in the list anymore after __detach_device
returns. So just repeatedly remove the first element of the
list until it is empty.

Tested-by: Marti Raudsepp <marti@...fo.org>
Signed-off-by: Joerg Roedel <jroedel@...e.de>
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 drivers/iommu/amd_iommu.c |   10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index c0536ed..a55353c3 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -3028,14 +3028,16 @@ free_domains:
 
 static void cleanup_domain(struct protection_domain *domain)
 {
-	struct iommu_dev_data *dev_data, *next;
+	struct iommu_dev_data *entry;
 	unsigned long flags;
 
 	write_lock_irqsave(&amd_iommu_devtable_lock, flags);
 
-	list_for_each_entry_safe(dev_data, next, &domain->dev_list, list) {
-		__detach_device(dev_data);
-		atomic_set(&dev_data->bind, 0);
+	while (!list_empty(&domain->dev_list)) {
+		entry = list_first_entry(&domain->dev_list,
+					 struct iommu_dev_data, list);
+		__detach_device(entry);
+		atomic_set(&entry->bind, 0);
 	}
 
 	write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
-- 
1.7.9.5

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