From: Yong Wu <yong.wu@mediatek.com> To: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>, 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>, <iommu@lists.linux-foundation.org>, <linux-mediatek@lists.infradead.org>, <linux-arm-kernel@lists.infradead.org>, <linux-kernel@vger.kernel.org>, <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: Re: [PATCH v4 3/6] iommu/mediatek: Add error path for loop of mm_dts_parse Date: Wed, 7 Sep 2022 11:08:05 +0800 [thread overview] Message-ID: <c5eca9b0154adf5a201ab89f3a9fa120b4519d25.camel@mediatek.com> (raw) In-Reply-To: <f0cc5ea8-9fd8-dc77-e595-33973e315d28@collabora.com> On Tue, 2022-08-30 at 10:14 +0200, AngeloGioacchino Del Regno wrote: > Il 24/08/22 08:43, Yong Wu ha scritto: > > 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 0..i 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;" > > That means set data->larb_imu[id].dev before the error path. > > then we don't need "platform_device_put(plarbdev)" again while > > probe_defer case. All depend on "put_device" in 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> > > --- > > drivers/iommu/mtk_iommu.c | 42 ++++++++++++++++++++++++++++---- > > ------- > > 1 file changed, 30 insertions(+), 12 deletions(-) [...] > > + > > +err_larbdev_put: > > + /* id may be not linear mapping, loop whole the array */ > > + for (i = 0; i < MTK_LARB_NR_MAX; i++) { > > Since there may be a case in which the mapping is linear and we're > doing teardown, > I think it would be sensible to loop the other way around instead, > from > MTK_LARB_NR_MAX to 0. Thanks very much. I will change from MTK_LARB_NR_MAX to 0. > > Everything else looks good to me. > > Cheers, > Angelo > > > + 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) > >
WARNING: multiple messages have this Message-ID (diff)
From: Yong Wu <yong.wu@mediatek.com> To: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>, 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>, <iommu@lists.linux-foundation.org>, <linux-mediatek@lists.infradead.org>, <linux-arm-kernel@lists.infradead.org>, <linux-kernel@vger.kernel.org>, <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: Re: [PATCH v4 3/6] iommu/mediatek: Add error path for loop of mm_dts_parse Date: Wed, 7 Sep 2022 11:08:05 +0800 [thread overview] Message-ID: <c5eca9b0154adf5a201ab89f3a9fa120b4519d25.camel@mediatek.com> (raw) In-Reply-To: <f0cc5ea8-9fd8-dc77-e595-33973e315d28@collabora.com> On Tue, 2022-08-30 at 10:14 +0200, AngeloGioacchino Del Regno wrote: > Il 24/08/22 08:43, Yong Wu ha scritto: > > 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 0..i 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;" > > That means set data->larb_imu[id].dev before the error path. > > then we don't need "platform_device_put(plarbdev)" again while > > probe_defer case. All depend on "put_device" in 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> > > --- > > drivers/iommu/mtk_iommu.c | 42 ++++++++++++++++++++++++++++---- > > ------- > > 1 file changed, 30 insertions(+), 12 deletions(-) [...] > > + > > +err_larbdev_put: > > + /* id may be not linear mapping, loop whole the array */ > > + for (i = 0; i < MTK_LARB_NR_MAX; i++) { > > Since there may be a case in which the mapping is linear and we're > doing teardown, > I think it would be sensible to loop the other way around instead, > from > MTK_LARB_NR_MAX to 0. Thanks very much. I will change from MTK_LARB_NR_MAX to 0. > > Everything else looks good to me. > > Cheers, > Angelo > > > + 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) > > _______________________________________________ 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:[~2022-09-07 3:08 UTC|newest] Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-08-24 6:43 [PATCH v4 0/6] iommu/mediatek: Improve safety from invalid dts input Yong Wu 2022-08-24 6:43 ` Yong Wu 2022-08-24 6:43 ` [PATCH v4 1/6] iommu/mediatek: Add platform_device_put for recovering the device refcnt Yong Wu 2022-08-24 6:43 ` Yong Wu 2022-08-30 8:16 ` AngeloGioacchino Del Regno 2022-08-30 8:16 ` AngeloGioacchino Del Regno 2022-08-24 6:43 ` [PATCH v4 2/6] iommu/mediatek: Use component_match_add Yong Wu 2022-08-24 6:43 ` Yong Wu 2022-08-24 6:43 ` [PATCH v4 3/6] iommu/mediatek: Add error path for loop of mm_dts_parse Yong Wu 2022-08-24 6:43 ` Yong Wu 2022-08-30 8:14 ` AngeloGioacchino Del Regno 2022-08-30 8:14 ` AngeloGioacchino Del Regno 2022-09-07 3:08 ` Yong Wu [this message] 2022-09-07 3:08 ` Yong Wu 2022-08-30 8:32 ` Dan Carpenter 2022-08-30 8:32 ` Dan Carpenter 2022-09-07 3:10 ` Yong Wu 2022-09-07 3:10 ` Yong Wu 2022-08-24 6:43 ` [PATCH v4 4/6] iommu/mediatek: Validate number of phandles associated with "mediatek,larbs" Yong Wu 2022-08-24 6:43 ` Yong Wu 2022-08-24 6:43 ` [PATCH v4 5/6] iommu/mediatek: Improve safety for mediatek,smi property in larb nodes Yong Wu 2022-08-24 6:43 ` Yong Wu 2022-08-30 8:16 ` AngeloGioacchino Del Regno 2022-08-30 8:16 ` AngeloGioacchino Del Regno 2022-08-24 6:43 ` [PATCH v4 6/6] iommu/mediatek: Remove unused "mapping" member from mtk_iommu_data Yong Wu 2022-08-24 6:43 ` Yong Wu
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