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iommu/mediatek: Fix M4Uv2 group refcounting
authorRobin Murphy <robin.murphy@arm.com>
Fri, 11 Nov 2016 17:59:24 +0000 (17:59 +0000)
committerJoerg Roedel <jroedel@suse.de>
Tue, 15 Nov 2016 11:25:33 +0000 (12:25 +0100)
commit3a8d40b6ce8c3f682d3b00a568d406b2f8726701
tree9843119a9ff7556b4ed1ccbedc0837e225e4b658tree | snapshot (tar.gz zip)
parentf2f101f6bcb3c47a432543dd309056e58192550fcommit | diff
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>
drivers/iommu/mtk_iommu.c diff | blob | blame | history