From: Baolu Lu <baolu.lu@linux.intel.com>
To: Jason Gunthorpe <jgg@nvidia.com>
Cc: baolu.lu@linux.intel.com,
Baolin Wang <baolin.wang@linux.alibaba.com>,
David Woodhouse <dwmw2@infradead.org>,
Heiko Stuebner <heiko@sntech.de>,
iommu@lists.linux.dev, Jernej Skrabec <jernej.skrabec@gmail.com>,
Joerg Roedel <joro@8bytes.org>,
linux-arm-kernel@lists.infradead.org,
linux-rockchip@lists.infradead.org, linux-sunxi@lists.linux.dev,
Orson Zhai <orsonzhai@gmail.com>,
Robin Murphy <robin.murphy@arm.com>,
Samuel Holland <samuel@sholland.org>,
Chen-Yu Tsai <wens@csie.org>, Will Deacon <will@kernel.org>,
Chunyan Zhang <zhang.lyra@gmail.com>,
Alex Williamson <alex.williamson@redhat.com>
Subject: Re: [PATCH 03/10] iommu: Add generic_single_device_group()
Date: Sat, 22 Jul 2023 22:01:04 +0800 [thread overview]
Message-ID: <1122d8bf-b10f-9376-e103-5fa9a0cba561@linux.intel.com> (raw)
In-Reply-To: <ZLq+PzR57D+RN2JF@nvidia.com>
On 2023/7/22 1:19, Jason Gunthorpe wrote:
> On Thu, Jul 20, 2023 at 10:01:54PM +0800, Baolu Lu wrote:
>
>> Then, another small comment:
>>
>> iommu->singleton_group will be freed with above put, right? Do you need
>> to set iommu->singleton_group to NULL? Given that iommu_device is not
>> freed here.
> Well, I think the general API is we expect the caller to free the
> iommu_device after calling unregister so this would be like all the
> other places we free or put something then go on to release the
> memory.
>
> At the very least if the caller thinks it should re-use the
> iommu_device then it needs to zero it.
>
> Notice this also doesn't hold the lock while putting it, we require no
> concurrent calls to probe with unregister.
Fair enough. Thanks for the explanation.
Best regards,
baolu
next prev parent reply other threads:[~2023-07-22 14:01 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-18 19:05 [PATCH 00/10] Refine the locking for dev->iommu_group Jason Gunthorpe
2023-07-18 19:05 ` [PATCH 01/10] iommu: Remove useless group refcounting Jason Gunthorpe
2023-07-20 6:11 ` Baolu Lu
2023-07-21 7:10 ` Tian, Kevin
2023-07-21 12:01 ` Jason Gunthorpe
2023-07-24 2:11 ` Tian, Kevin
2023-07-24 18:06 ` Jason Gunthorpe
2023-07-25 2:12 ` Tian, Kevin
2023-07-18 19:05 ` [PATCH 02/10] iommu: Add a lockdep assertion for remaining dev->iommu_group reads Jason Gunthorpe
2023-07-20 6:33 ` Baolu Lu
2023-07-18 19:05 ` [PATCH 03/10] iommu: Add generic_single_device_group() Jason Gunthorpe
2023-07-20 7:39 ` Baolu Lu
2023-07-20 12:04 ` Jason Gunthorpe
2023-07-20 14:01 ` Baolu Lu
2023-07-21 17:19 ` Jason Gunthorpe
2023-07-22 14:01 ` Baolu Lu [this message]
2023-07-21 7:17 ` Tian, Kevin
2023-07-24 13:15 ` Jason Gunthorpe
2023-07-22 14:02 ` Baolu Lu
2023-07-18 19:05 ` [PATCH 04/10] iommu/sun50i: Convert to generic_single_device_group() Jason Gunthorpe
2023-07-18 19:05 ` [PATCH 05/10] iommu/sprd: " Jason Gunthorpe
2023-07-18 19:05 ` [PATCH 06/10] iommu/rockchip: " Jason Gunthorpe
2023-07-18 19:05 ` [PATCH 07/10] iommu/ipmmu-vmsa: " Jason Gunthorpe
2023-07-21 7:20 ` Tian, Kevin
2023-07-21 12:04 ` Jason Gunthorpe
2023-07-18 19:05 ` [PATCH 08/10] iommu/omap: " Jason Gunthorpe
2023-07-18 19:05 ` [PATCH 09/10] iommu: Complete the locking for dev->iommu_group Jason Gunthorpe
2023-07-20 9:55 ` Baolu Lu
2023-07-18 19:05 ` [PATCH 10/10] iommu/intel: Fix missing locking for show_device_domain_translation() Jason Gunthorpe
2023-07-20 9:56 ` Baolu Lu
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