linux-kernel - RE: [PATCH v5 09/13] iommufd/selftest: Add refcount to mock_iommu

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Message-ID: <BN9PR11MB5276FD0E6D0BAB2318ACFCB88C4A2@BN9PR11MB5276.namprd11.prod.outlook.com>
Date: Mon, 28 Oct 2024 02:49:59 +0000
From: "Tian, Kevin" <kevin.tian@...el.com>
To: Nicolin Chen <nicolinc@...dia.com>, "jgg@...dia.com" <jgg@...dia.com>,
	"will@...nel.org" <will@...nel.org>
CC: "joro@...tes.org" <joro@...tes.org>, "suravee.suthikulpanit@....com"
	<suravee.suthikulpanit@....com>, "robin.murphy@....com"
	<robin.murphy@....com>, "dwmw2@...radead.org" <dwmw2@...radead.org>,
	"baolu.lu@...ux.intel.com" <baolu.lu@...ux.intel.com>, "shuah@...nel.org"
	<shuah@...nel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "iommu@...ts.linux.dev"
	<iommu@...ts.linux.dev>, "linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "linux-kselftest@...r.kernel.org"
	<linux-kselftest@...r.kernel.org>, "eric.auger@...hat.com"
	<eric.auger@...hat.com>, "jean-philippe@...aro.org"
	<jean-philippe@...aro.org>, "mdf@...nel.org" <mdf@...nel.org>,
	"mshavit@...gle.com" <mshavit@...gle.com>,
	"shameerali.kolothum.thodi@...wei.com"
	<shameerali.kolothum.thodi@...wei.com>, "smostafa@...gle.com"
	<smostafa@...gle.com>, "Liu, Yi L" <yi.l.liu@...el.com>, "aik@....com"
	<aik@....com>, "zhangfei.gao@...aro.org" <zhangfei.gao@...aro.org>,
	"patches@...ts.linux.dev" <patches@...ts.linux.dev>
Subject: RE: [PATCH v5 09/13] iommufd/selftest: Add refcount to
 mock_iommu_device

> From: Nicolin Chen <nicolinc@...dia.com>
> Sent: Saturday, October 26, 2024 7:50 AM
> 
> For an iommu_dev that can unplug (so far only this selftest does so), the
> viommu->iommu_dev pointer has no guarantee of its life cycle after it is
> copied from the idev->dev->iommu->iommu_dev.
> 
> Track the user count of the iommu_dev. Postpone the exit routine using a
> completion, if refcount is unbalanced. The refcount inc/dec will be added
> in the following patch.
> 
> Signed-off-by: Nicolin Chen <nicolinc@...dia.com>

Reviewed-by: Kevin Tian <kevin.tian@...el.com>