diff options
| author | Robin Murphy <robin.murphy@arm.com> | 2016-11-11 17:59:23 +0000 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2016-11-15 12:25:33 +0100 |
| commit | f2f101f6bcb3c47a432543dd309056e58192550f (patch) | |
| tree | fa7da845cdaba345ecd76dcd35add6f87980fd97 /drivers/iommu | |
| parent | e1b44cbe7b5d4d97e43a1476b68e0adc1aa5e383 (diff) | |
| download | linux-stable-f2f101f6bcb3c47a432543dd309056e58192550f.tar.gz linux-stable-f2f101f6bcb3c47a432543dd309056e58192550f.tar.bz2 linux-stable-f2f101f6bcb3c47a432543dd309056e58192550f.zip | |
iommu/amd: Fix group refcounting
If acpihid_device_group() finds an existing group for the relevant
devid, it should be taking an additional reference on that group.
Otherwise, the caller of iommu_group_get_for_dev() will inadvertently
remove the reference taken by iommu_group_add_device(), and the group
will be freed prematurely if any device is removed.
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/amd_iommu.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c index 754595ee11b6..019e02707cd5 100644 --- a/drivers/iommu/amd_iommu.c +++ b/drivers/iommu/amd_iommu.c @@ -373,6 +373,8 @@ static struct iommu_group *acpihid_device_group(struct device *dev) if (!entry->group) entry->group = generic_device_group(dev); + else + iommu_group_ref_get(entry->group); return entry->group; } |