[PATCH 5.10 320/452] iommu/mediatek: Add list_del in mtk_iommu_remove

From: Greg Kroah-Hartman
Date: Tue Jun 07 2022 - 13:59:50 EST


From: Yong Wu <yong.wu@xxxxxxxxxxxx>

[ 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@xxxxxxxxxxxx>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
Reviewed-by: Matthias Brugger <matthias.bgg@xxxxxxxxx>
Link: https://lore.kernel.org/r/20220503071427.2285-6-yong.wu@xxxxxxxxxxxx
Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
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 19387d2bc4b4..051815c9d2bb 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -768,8 +768,7 @@ 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);
--
2.35.1