[3.13.y.z extended stable] Patch "iommu/amd: Fix cleanup_domain for mass device removal" has been added to staging queue

Kamal Mostafa kamal at canonical.com
Tue Sep 30 21:29:26 UTC 2014


This is a note to let you know that I have just added a patch titled

    iommu/amd: Fix cleanup_domain for mass device removal

to the linux-3.13.y-queue branch of the 3.13.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.13.y-queue

This patch is scheduled to be released in version 3.13.11.8.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.13.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

------

>From 1ded23e654cb0b333068ebfc95cda46e90e16934 Mon Sep 17 00:00:00 2001
From: Joerg Roedel <jroedel at suse.de>
Date: Tue, 5 Aug 2014 17:50:15 +0200
Subject: iommu/amd: Fix cleanup_domain for mass device removal

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 at juffo.org>
Signed-off-by: Joerg Roedel <jroedel at suse.de>
Signed-off-by: Kamal Mostafa <kamal at canonical.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 76e579a..1d3e371 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -3227,14 +3227,16 @@ 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);
--
1.9.1





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