From: Yong Wu <yong.wu@mediatek.com> To: Joerg Roedel <joro@8bytes.org>, Matthias Brugger <matthias.bgg@gmail.com>, Will Deacon <will@kernel.org> Cc: Robin Murphy <robin.murphy@arm.com>, <iommu@lists.linux.dev>, <linux-mediatek@lists.infradead.org>, <linux-arm-kernel@lists.infradead.org>, <linux-kernel@vger.kernel.org>, Yong Wu <yong.wu@mediatek.com>, AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>, <mingyuan.ma@mediatek.com>, <yf.wang@mediatek.com>, <libo.kang@mediatek.com>, <chengci.xu@mediatek.com>, <youlin.pei@mediatek.com>, <anan.sun@mediatek.com>, <xueqi.zhang@mediatek.com>, Guenter Roeck <groeck@chromium.org>, Dan Carpenter <dan.carpenter@oracle.com> Subject: [PATCH v7 3/6] iommu/mediatek: Add error path for loop of mm_dts_parse Date: Tue, 18 Oct 2022 10:42:55 +0800 [thread overview] Message-ID: <20221018024258.19073-4-yong.wu@mediatek.com> (raw) In-Reply-To: <20221018024258.19073-1-yong.wu@mediatek.com> The mtk_iommu_mm_dts_parse will parse the smi larbs nodes. if the i+1 larb is parsed fail, we should put_device for the i..0 larbs. There are two places need to comment: 1) The larbid may be not linear mapping, we should loop whole the array in the error path. 2) I move this line position: "data->larb_imu[id].dev = &plarbdev->dev;" before "if (!plarbdev->dev.driver)", That means set data->larb_imu[id].dev before the error path. then we don't need "platform_device_put(plarbdev)" again in probe_defer case. All depend on "put_device" of the error path in error cases. Fixes: d2e9a1102cfc ("iommu/mediatek: Contain MM IOMMU flow with the MM TYPE") Signed-off-by: Yong Wu <yong.wu@mediatek.com> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> --- drivers/iommu/mtk_iommu.c | 27 ++++++++++++++++++++------- 1 file changed, 20 insertions(+), 7 deletions(-) diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c index 38112ad87d70..912322494bc0 100644 --- a/drivers/iommu/mtk_iommu.c +++ b/drivers/iommu/mtk_iommu.c @@ -1055,8 +1055,10 @@ static int mtk_iommu_mm_dts_parse(struct device *dev, struct component_match **m u32 id; larbnode = of_parse_phandle(dev->of_node, "mediatek,larbs", i); - if (!larbnode) - return -EINVAL; + if (!larbnode) { + ret = -EINVAL; + goto err_larbdev_put; + } if (!of_device_is_available(larbnode)) { of_node_put(larbnode); @@ -1069,14 +1071,16 @@ static int mtk_iommu_mm_dts_parse(struct device *dev, struct component_match **m plarbdev = of_find_device_by_node(larbnode); of_node_put(larbnode); - if (!plarbdev) - return -ENODEV; + if (!plarbdev) { + ret = -ENODEV; + goto err_larbdev_put; + } + data->larb_imu[id].dev = &plarbdev->dev; if (!plarbdev->dev.driver) { - platform_device_put(plarbdev); - return -EPROBE_DEFER; + ret = -EPROBE_DEFER; + goto err_larbdev_put; } - data->larb_imu[id].dev = &plarbdev->dev; component_match_add(dev, match, component_compare_dev, &plarbdev->dev); platform_device_put(plarbdev); @@ -1111,6 +1115,15 @@ static int mtk_iommu_mm_dts_parse(struct device *dev, struct component_match **m return -EINVAL; } return 0; + +err_larbdev_put: + /* id may be not linear mapping, loop whole the array */ + for (i = MTK_LARB_NR_MAX - 1; i >= 0; i++) { + if (!data->larb_imu[i].dev) + continue; + put_device(data->larb_imu[i].dev); + } + return ret; } static int mtk_iommu_probe(struct platform_device *pdev) -- 2.18.0
WARNING: multiple messages have this Message-ID (diff)
From: Yong Wu <yong.wu@mediatek.com> To: Joerg Roedel <joro@8bytes.org>, Matthias Brugger <matthias.bgg@gmail.com>, Will Deacon <will@kernel.org> Cc: Robin Murphy <robin.murphy@arm.com>, <iommu@lists.linux.dev>, <linux-mediatek@lists.infradead.org>, <linux-arm-kernel@lists.infradead.org>, <linux-kernel@vger.kernel.org>, Yong Wu <yong.wu@mediatek.com>, AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>, <mingyuan.ma@mediatek.com>, <yf.wang@mediatek.com>, <libo.kang@mediatek.com>, <chengci.xu@mediatek.com>, <youlin.pei@mediatek.com>, <anan.sun@mediatek.com>, <xueqi.zhang@mediatek.com>, Guenter Roeck <groeck@chromium.org>, Dan Carpenter <dan.carpenter@oracle.com> Subject: [PATCH v7 3/6] iommu/mediatek: Add error path for loop of mm_dts_parse Date: Tue, 18 Oct 2022 10:42:55 +0800 [thread overview] Message-ID: <20221018024258.19073-4-yong.wu@mediatek.com> (raw) In-Reply-To: <20221018024258.19073-1-yong.wu@mediatek.com> The mtk_iommu_mm_dts_parse will parse the smi larbs nodes. if the i+1 larb is parsed fail, we should put_device for the i..0 larbs. There are two places need to comment: 1) The larbid may be not linear mapping, we should loop whole the array in the error path. 2) I move this line position: "data->larb_imu[id].dev = &plarbdev->dev;" before "if (!plarbdev->dev.driver)", That means set data->larb_imu[id].dev before the error path. then we don't need "platform_device_put(plarbdev)" again in probe_defer case. All depend on "put_device" of the error path in error cases. Fixes: d2e9a1102cfc ("iommu/mediatek: Contain MM IOMMU flow with the MM TYPE") Signed-off-by: Yong Wu <yong.wu@mediatek.com> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> --- drivers/iommu/mtk_iommu.c | 27 ++++++++++++++++++++------- 1 file changed, 20 insertions(+), 7 deletions(-) diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c index 38112ad87d70..912322494bc0 100644 --- a/drivers/iommu/mtk_iommu.c +++ b/drivers/iommu/mtk_iommu.c @@ -1055,8 +1055,10 @@ static int mtk_iommu_mm_dts_parse(struct device *dev, struct component_match **m u32 id; larbnode = of_parse_phandle(dev->of_node, "mediatek,larbs", i); - if (!larbnode) - return -EINVAL; + if (!larbnode) { + ret = -EINVAL; + goto err_larbdev_put; + } if (!of_device_is_available(larbnode)) { of_node_put(larbnode); @@ -1069,14 +1071,16 @@ static int mtk_iommu_mm_dts_parse(struct device *dev, struct component_match **m plarbdev = of_find_device_by_node(larbnode); of_node_put(larbnode); - if (!plarbdev) - return -ENODEV; + if (!plarbdev) { + ret = -ENODEV; + goto err_larbdev_put; + } + data->larb_imu[id].dev = &plarbdev->dev; if (!plarbdev->dev.driver) { - platform_device_put(plarbdev); - return -EPROBE_DEFER; + ret = -EPROBE_DEFER; + goto err_larbdev_put; } - data->larb_imu[id].dev = &plarbdev->dev; component_match_add(dev, match, component_compare_dev, &plarbdev->dev); platform_device_put(plarbdev); @@ -1111,6 +1115,15 @@ static int mtk_iommu_mm_dts_parse(struct device *dev, struct component_match **m return -EINVAL; } return 0; + +err_larbdev_put: + /* id may be not linear mapping, loop whole the array */ + for (i = MTK_LARB_NR_MAX - 1; i >= 0; i++) { + if (!data->larb_imu[i].dev) + continue; + put_device(data->larb_imu[i].dev); + } + return ret; } static int mtk_iommu_probe(struct platform_device *pdev) -- 2.18.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2022-10-18 2:44 UTC|newest] Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-10-18 2:42 [PATCH v7 0/6] iommu/mediatek: Improve safety from invalid dts input Yong Wu 2022-10-18 2:42 ` Yong Wu 2022-10-18 2:42 ` [PATCH v7 1/6] iommu/mediatek: Add platform_device_put for recovering the device refcnt Yong Wu 2022-10-18 2:42 ` Yong Wu 2022-11-22 16:24 ` Matthias Brugger 2022-11-22 16:24 ` Matthias Brugger 2022-10-18 2:42 ` [PATCH v7 2/6] iommu/mediatek: Use component_match_add Yong Wu 2022-10-18 2:42 ` Yong Wu 2022-11-22 16:28 ` Matthias Brugger 2022-11-22 16:28 ` Matthias Brugger 2022-10-18 2:42 ` Yong Wu [this message] 2022-10-18 2:42 ` [PATCH v7 3/6] iommu/mediatek: Add error path for loop of mm_dts_parse Yong Wu 2022-11-22 16:32 ` Matthias Brugger 2022-11-22 16:32 ` Matthias Brugger 2022-10-18 2:42 ` [PATCH v7 4/6] iommu/mediatek: Validate number of phandles associated with "mediatek,larbs" Yong Wu 2022-10-18 2:42 ` Yong Wu 2022-11-22 16:43 ` Matthias Brugger 2022-11-22 16:43 ` Matthias Brugger 2022-10-18 2:42 ` [PATCH v7 5/6] iommu/mediatek: Improve safety for mediatek,smi property in larb nodes Yong Wu 2022-10-18 2:42 ` Yong Wu 2022-11-22 16:49 ` Matthias Brugger 2022-11-22 16:49 ` Matthias Brugger 2022-10-18 2:42 ` [PATCH v7 6/6] iommu/mediatek: Remove unused "mapping" member from mtk_iommu_data Yong Wu 2022-10-18 2:42 ` Yong Wu 2022-11-22 1:13 ` [PATCH v7 0/6] iommu/mediatek: Improve safety from invalid dts input Yong Wu (吴勇) 2022-11-22 1:13 ` Yong Wu (吴勇) 2022-11-22 8:30 ` joro 2022-11-22 8:30 ` joro 2022-12-05 10:46 ` Joerg Roedel 2022-12-05 10:46 ` Joerg Roedel
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