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| author |   Robin Murphy <robin.murphy@arm.com> | 2016-11-11 17:59:24 +0000 |
|---|---|---|
| committer |   Joerg Roedel <jroedel@suse.de> | 2016-11-15 12:25:33 +0100 |
| commit | 3a8d40b6ce8c3f682d3b00a568d406b2f8726701 (patch) | |
| tree | 9843119a9ff7556b4ed1ccbedc0837e225e4b658 /drivers/iommu | |
| parent | iommu/amd: Fix group refcounting (diff) | |
| download | linux-dev-3a8d40b6ce8c3f682d3b00a568d406b2f8726701.tar.xz linux-dev-3a8d40b6ce8c3f682d3b00a568d406b2f8726701.zip | |
iommu/mediatek: Fix M4Uv2 group refcounting
For each subsequent device assigned to the m4u_group after its initial
allocation, we need to take an additional reference. 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/mtk_iommu.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c index b12c12d74c33..9799daeaacde 100644 --- a/drivers/iommu/mtk_iommu.c +++ b/drivers/iommu/mtk_iommu.c @@ -410,6 +410,8 @@ static struct iommu_group *mtk_iommu_device_group(struct device *dev) data->m4u_group = iommu_group_alloc(); if (IS_ERR(data->m4u_group)) dev_err(dev, "Failed to allocate M4U IOMMU group\n"); + } else { + iommu_group_ref_get(data->m4u_group); } return data->m4u_group; } |