This is a note to let you know that I've just added the patch titled
iommu/amd: Fix cleanup_domain for mass device removal
to the 3.16-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
iommu-amd-fix-cleanup_domain-for-mass-device-removal.patch
and it can be found in the queue-3.16 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 9b29d3c6510407d91786c1cf9183ff4debb3473a Mon Sep 17 00:00:00 2001
From: Joerg Roedel <jroedel@xxxxxxx>
Date: Tue, 5 Aug 2014 17:50:15 +0200
Subject: iommu/amd: Fix cleanup_domain for mass device removal
From: Joerg Roedel <jroedel@xxxxxxx>
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@xxxxxxxxx>
Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/iommu/amd_iommu.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
--- 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);
Patches currently in stable-queue which might be from jroedel@xxxxxxx are
queue-3.16/iommu-amd-fix-cleanup_domain-for-mass-device-removal.patch
queue-3.16/iommu-vt-d-exclude-devices-using-rmrrs-from-iommu-api-domains.patch
queue-3.16/iommu-vt-d-defer-domain-removal-if-device-is-assigned-to-a-driver.patch
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