6.1-stable review patch. If anyone has any objections, please let me know.
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From: Johan Hovold johan@kernel.org
[ Upstream commit 46207625c9f33da0e43bb4ae1e91f0791b6ed633 ]
Make sure to drop the references taken to the larb devices during probe on probe failure (e.g. probe deferral) and on driver unbind.
Fixes: b17336c55d89 ("iommu/mediatek: add support for mtk iommu generation one HW") Cc: stable@vger.kernel.org # 4.8 Cc: Honghui Zhang honghui.zhang@mediatek.com Acked-by: Robin Murphy robin.murphy@arm.com Signed-off-by: Johan Hovold johan@kernel.org Reviewed-by: AngeloGioacchino Del Regno angelogioacchino.delregno@collabora.com Signed-off-by: Joerg Roedel joerg.roedel@amd.com Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/iommu/mtk_iommu_v1.c | 23 ++++++++++++++++++----- 1 file changed, 18 insertions(+), 5 deletions(-)
--- a/drivers/iommu/mtk_iommu_v1.c +++ b/drivers/iommu/mtk_iommu_v1.c @@ -656,8 +656,10 @@ static int mtk_iommu_v1_probe(struct pla struct platform_device *plarbdev;
larbnode = of_parse_phandle(dev->of_node, "mediatek,larbs", i); - if (!larbnode) - return -EINVAL; + if (!larbnode) { + ret = -EINVAL; + goto out_put_larbs; + }
if (!of_device_is_available(larbnode)) { of_node_put(larbnode); @@ -667,11 +669,14 @@ static int mtk_iommu_v1_probe(struct pla plarbdev = of_find_device_by_node(larbnode); if (!plarbdev) { of_node_put(larbnode); - return -ENODEV; + ret = -ENODEV; + goto out_put_larbs; } if (!plarbdev->dev.driver) { of_node_put(larbnode); - return -EPROBE_DEFER; + put_device(&plarbdev->dev); + ret = -EPROBE_DEFER; + goto out_put_larbs; } data->larb_imu[i].dev = &plarbdev->dev;
@@ -683,7 +688,7 @@ static int mtk_iommu_v1_probe(struct pla
ret = mtk_iommu_v1_hw_init(data); if (ret) - return ret; + goto out_put_larbs;
ret = iommu_device_sysfs_add(&data->iommu, &pdev->dev, NULL, dev_name(&pdev->dev)); @@ -705,12 +710,17 @@ out_sysfs_remove: iommu_device_sysfs_remove(&data->iommu); out_clk_unprepare: clk_disable_unprepare(data->bclk); +out_put_larbs: + for (i = 0; i < MTK_LARB_NR_MAX; i++) + put_device(data->larb_imu[i].dev); + return ret; }
static void mtk_iommu_v1_remove(struct platform_device *pdev) { struct mtk_iommu_v1_data *data = platform_get_drvdata(pdev); + int i;
iommu_device_sysfs_remove(&data->iommu); iommu_device_unregister(&data->iommu); @@ -718,6 +728,9 @@ static void mtk_iommu_v1_remove(struct p clk_disable_unprepare(data->bclk); devm_free_irq(&pdev->dev, data->irq, data); component_master_del(&pdev->dev, &mtk_iommu_v1_com_ops); + + for (i = 0; i < MTK_LARB_NR_MAX; i++) + put_device(data->larb_imu[i].dev); }
static int __maybe_unused mtk_iommu_v1_suspend(struct device *dev)