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iommu/amd: Fix cleanup_domain for mass device removal 

commit 9b29d3c651 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@juffo.org>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Joerg Roedel 2014-08-05 17:50:15 +02:00 committed by Greg Kroah-Hartman
parent ca6e483cd9
commit 5b35fc7d51
1 changed files with 6 additions and 4 deletions
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10
drivers/iommu/amd_iommu.c
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@ -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);