linux-kernel - Re: [PATCH v5 04/13] iommufd/viommu: Add IOMMU_VIOMMU

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Message-ID: <ZyEDYFxHZ3XkwTfh@Asurada-Nvidia>
Date: Tue, 29 Oct 2024 08:46:40 -0700
From: Nicolin Chen <nicolinc@...dia.com>
To: Jason Gunthorpe <jgg@...dia.com>
CC: <kevin.tian@...el.com>, <will@...nel.org>, <joro@...tes.org>,
	<suravee.suthikulpanit@....com>, <robin.murphy@....com>,
	<dwmw2@...radead.org>, <baolu.lu@...ux.intel.com>, <shuah@...nel.org>,
	<linux-kernel@...r.kernel.org>, <iommu@...ts.linux.dev>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-kselftest@...r.kernel.org>,
	<eric.auger@...hat.com>, <jean-philippe@...aro.org>, <mdf@...nel.org>,
	<mshavit@...gle.com>, <shameerali.kolothum.thodi@...wei.com>,
	<smostafa@...gle.com>, <yi.l.liu@...el.com>, <aik@....com>,
	<zhangfei.gao@...aro.org>, <patches@...ts.linux.dev>
Subject: Re: [PATCH v5 04/13] iommufd/viommu: Add IOMMU_VIOMMU_ALLOC ioctl

On Tue, Oct 29, 2024 at 12:36:24PM -0300, Jason Gunthorpe wrote:
> On Tue, Oct 29, 2024 at 11:54:36AM -0300, Jason Gunthorpe wrote:
> > On Fri, Oct 25, 2024 at 04:49:44PM -0700, Nicolin Chen wrote:
> > > +void iommufd_viommu_destroy(struct iommufd_object *obj)
> > > +{
> > > +	struct iommufd_viommu *viommu =
> > > +		container_of(obj, struct iommufd_viommu, obj);
> > > +
> > > +	if (viommu->ops && viommu->ops->free)
> > > +		viommu->ops->free(viommu);
> > 
> > Ops can't be null and free can't be null, that would mean there is a
> > memory leak.
> 
> Actually, it is just named wrong, it should be called destroy like
> this op, it doesn't free any memory..

Well, it frees if driver allocated something in its top structure.
Yet, "destroy" does sound less confusing. Let's rename it, assuming
it can still remain to be optional as we have here.

Thanks
Nicolin