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 1/6] iommu/mediatek: Add platform_device_put for recovering the device refcnt Date: Tue, 18 Oct 2022 10:42:53 +0800 [thread overview] Message-ID: <20221018024258.19073-2-yong.wu@mediatek.com> (raw) In-Reply-To: <20221018024258.19073-1-yong.wu@mediatek.com> Add platform_device_put to match with of_find_device_by_node. Meanwhile, I add a new variable "pcommdev" which is for smi common device. Otherwise, "platform_device_put(plarbdev)" for smi-common dev may be not readable. And add a checking for whether pcommdev is NULL. 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 | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c index 5a4e00e4bbbc..3189b585725f 100644 --- a/drivers/iommu/mtk_iommu.c +++ b/drivers/iommu/mtk_iommu.c @@ -1043,7 +1043,7 @@ static int mtk_iommu_mm_dts_parse(struct device *dev, struct component_match **m struct mtk_iommu_data *data) { struct device_node *larbnode, *smicomm_node, *smi_subcomm_node; - struct platform_device *plarbdev; + struct platform_device *plarbdev, *pcommdev; struct device_link *link; int i, larb_nr, ret; @@ -1074,12 +1074,14 @@ static int mtk_iommu_mm_dts_parse(struct device *dev, struct component_match **m } if (!plarbdev->dev.driver) { of_node_put(larbnode); + platform_device_put(plarbdev); return -EPROBE_DEFER; } data->larb_imu[id].dev = &plarbdev->dev; component_match_add_release(dev, match, component_release_of, component_compare_of, larbnode); + platform_device_put(plarbdev); } /* Get smi-(sub)-common dev from the last larb. */ @@ -1097,12 +1099,15 @@ static int mtk_iommu_mm_dts_parse(struct device *dev, struct component_match **m else smicomm_node = smi_subcomm_node; - plarbdev = of_find_device_by_node(smicomm_node); + pcommdev = of_find_device_by_node(smicomm_node); of_node_put(smicomm_node); - data->smicomm_dev = &plarbdev->dev; + if (!pcommdev) + return -ENODEV; + data->smicomm_dev = &pcommdev->dev; link = device_link_add(data->smicomm_dev, dev, DL_FLAG_STATELESS | DL_FLAG_PM_RUNTIME); + platform_device_put(pcommdev); if (!link) { dev_err(dev, "Unable to link %s.\n", dev_name(data->smicomm_dev)); return -EINVAL; -- 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 1/6] iommu/mediatek: Add platform_device_put for recovering the device refcnt Date: Tue, 18 Oct 2022 10:42:53 +0800 [thread overview] Message-ID: <20221018024258.19073-2-yong.wu@mediatek.com> (raw) In-Reply-To: <20221018024258.19073-1-yong.wu@mediatek.com> Add platform_device_put to match with of_find_device_by_node. Meanwhile, I add a new variable "pcommdev" which is for smi common device. Otherwise, "platform_device_put(plarbdev)" for smi-common dev may be not readable. And add a checking for whether pcommdev is NULL. 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 | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c index 5a4e00e4bbbc..3189b585725f 100644 --- a/drivers/iommu/mtk_iommu.c +++ b/drivers/iommu/mtk_iommu.c @@ -1043,7 +1043,7 @@ static int mtk_iommu_mm_dts_parse(struct device *dev, struct component_match **m struct mtk_iommu_data *data) { struct device_node *larbnode, *smicomm_node, *smi_subcomm_node; - struct platform_device *plarbdev; + struct platform_device *plarbdev, *pcommdev; struct device_link *link; int i, larb_nr, ret; @@ -1074,12 +1074,14 @@ static int mtk_iommu_mm_dts_parse(struct device *dev, struct component_match **m } if (!plarbdev->dev.driver) { of_node_put(larbnode); + platform_device_put(plarbdev); return -EPROBE_DEFER; } data->larb_imu[id].dev = &plarbdev->dev; component_match_add_release(dev, match, component_release_of, component_compare_of, larbnode); + platform_device_put(plarbdev); } /* Get smi-(sub)-common dev from the last larb. */ @@ -1097,12 +1099,15 @@ static int mtk_iommu_mm_dts_parse(struct device *dev, struct component_match **m else smicomm_node = smi_subcomm_node; - plarbdev = of_find_device_by_node(smicomm_node); + pcommdev = of_find_device_by_node(smicomm_node); of_node_put(smicomm_node); - data->smicomm_dev = &plarbdev->dev; + if (!pcommdev) + return -ENODEV; + data->smicomm_dev = &pcommdev->dev; link = device_link_add(data->smicomm_dev, dev, DL_FLAG_STATELESS | DL_FLAG_PM_RUNTIME); + platform_device_put(pcommdev); if (!link) { dev_err(dev, "Unable to link %s.\n", dev_name(data->smicomm_dev)); return -EINVAL; -- 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 2:43 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 ` Yong Wu [this message] 2022-10-18 2:42 ` [PATCH v7 1/6] iommu/mediatek: Add platform_device_put for recovering the device refcnt 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 ` [PATCH v7 3/6] iommu/mediatek: Add error path for loop of mm_dts_parse Yong Wu 2022-10-18 2:42 ` 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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