From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailgw01.mediatek.com (unknown [60.244.123.138]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7966A7E for ; Wed, 24 Aug 2022 06:43:30 +0000 (UTC) X-UUID: 33e4277b0ee84051b6a642edeeb4a3d2-20220824 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Type:MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:CC:To:From; bh=A3qTuTSr5OagiNa+13tMRGYgYOq3vyr5UScEsLTVm1k=; b=EVhbNqS3S+zCPhwaN7tQHxNRX/n7CDyVgCUDA5YqyMCqh+xOVf1g800WuiuzJRMhaLb7JwsZ7qhrLgSp50MOq3QwB3NAEZwMKBGFLQBKXQ6xmA0mc2Sd3tA838CubM8jaZGBmOAny0HuSXtFtt7XZyzI9bBXXuved+c7ojYlJ7c=; X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.10,REQID:5d3d0fa1-6760-4eeb-bf5b-54125b4d6e37,OB:0,L OB:0,IP:0,URL:0,TC:0,Content:-5,EDM:0,RT:0,SF:0,FILE:0,BULK:0,RULE:Release _Ham,ACTION:release,TS:-5 X-CID-META: VersionHash:84eae18,CLOUDID:a348a1c9-6b09-4f60-bf82-12f039f5d530,C OID:IGNORED,Recheck:0,SF:nil,TC:nil,Content:0,EDM:-3,IP:nil,URL:0,File:nil ,Bulk:nil,QS:nil,BEC:nil,COL:0 X-UUID: 33e4277b0ee84051b6a642edeeb4a3d2-20220824 Received: from mtkexhb02.mediatek.inc [(172.21.101.103)] by mailgw01.mediatek.com (envelope-from ) (Generic MTA with TLSv1.2 ECDHE-RSA-AES256-SHA384 256/256) with ESMTP id 170543335; Wed, 24 Aug 2022 14:43:26 +0800 Received: from mtkmbs11n2.mediatek.inc (172.21.101.187) by mtkmbs11n1.mediatek.inc (172.21.101.185) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.792.15; Wed, 24 Aug 2022 14:43:25 +0800 Received: from localhost.localdomain (10.17.3.154) by mtkmbs11n2.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.792.15 via Frontend Transport; Wed, 24 Aug 2022 14:43:24 +0800 From: Yong Wu To: Joerg Roedel , Matthias Brugger , Will Deacon CC: Robin Murphy , , , , , , Yong Wu , AngeloGioacchino Del Regno , , , , , , , , Guenter Roeck , Dan Carpenter Subject: [PATCH v4 1/6] iommu/mediatek: Add platform_device_put for recovering the device refcnt Date: Wed, 24 Aug 2022 14:43:01 +0800 Message-ID: <20220824064306.21495-2-yong.wu@mediatek.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20220824064306.21495-1-yong.wu@mediatek.com> References: <20220824064306.21495-1-yong.wu@mediatek.com> Precedence: bulk X-Mailing-List: iommu@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain X-MTK: N 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 --- 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 7e363b1f24df..f2560ce72b6c 100644 --- a/drivers/iommu/mtk_iommu.c +++ b/drivers/iommu/mtk_iommu.c @@ -1041,7 +1041,7 @@ 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; @@ -1072,12 +1072,14 @@ 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. */ @@ -1095,12 +1097,15 @@ 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 -EINVAL; + 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