From: Yong Wu yong.wu@mediatek.com
stable inclusion from stable-v5.10.121 commit da748d263a6400fc3eff20ea0a738e82c78f4576 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I5L6CQ
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ Upstream commit ee55f75e4bcade81d253163641b63bef3e76cac4 ]
Lack the list_del in the mtk_iommu_remove, and remove bus_set_iommu(*, NULL) since there may be several iommu HWs. we can not bus_set_iommu null when one iommu driver unbind.
This could be a fix for mt2712 which support 2 M4U HW and list them.
Fixes: 7c3a2ec02806 ("iommu/mediatek: Merge 2 M4U HWs into one iommu domain") Signed-off-by: Yong Wu yong.wu@mediatek.com Reviewed-by: AngeloGioacchino Del Regno angelogioacchino.delregno@collabora.com Reviewed-by: Matthias Brugger matthias.bgg@gmail.com Link: https://lore.kernel.org/r/20220503071427.2285-6-yong.wu@mediatek.com Signed-off-by: Joerg Roedel jroedel@suse.de Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com Acked-by: Xie XiuQi xiexiuqi@huawei.com --- drivers/iommu/mtk_iommu.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c index bfe6ec329f8d..dd0ff2d3cfe4 100644 --- a/drivers/iommu/mtk_iommu.c +++ b/drivers/iommu/mtk_iommu.c @@ -767,8 +767,7 @@ static int mtk_iommu_remove(struct platform_device *pdev) iommu_device_sysfs_remove(&data->iommu); iommu_device_unregister(&data->iommu);
- if (iommu_present(&platform_bus_type)) - bus_set_iommu(&platform_bus_type, NULL); + list_del(&data->list);
clk_disable_unprepare(data->bclk); devm_free_irq(&pdev->dev, data->irq, data);