iommu/mediatek: Fix M4Uv2 group refcounting

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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>

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Robin Murphy 2016-11-11 17:59:24 +00:00 • committed by Joerg Roedel

parent f2f101f6bc

commit 3a8d40b6ce

1 changed files with 2 additions and 0 deletions

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drivers/iommu/mtk_iommu.c

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