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Date:   Tue, 5 Mar 2019 10:27:33 -0800
From:   Stephen Hemminger <stephen@networkplumber.org>
To:     Dexuan Cui <decui@microsoft.com>
Cc:     "lorenzo.pieralisi@arm.com" <lorenzo.pieralisi@arm.com>,
        "bhelgaas@google.com" <bhelgaas@google.com>,
        "linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
        KY Srinivasan <kys@microsoft.com>,
        Stephen Hemminger <sthemmin@microsoft.com>,
        Michael Kelley <mikelley@microsoft.com>,
        Sasha Levin <Alexander.Levin@microsoft.com>,
        "linux-hyperv@vger.kernel.org" <linux-hyperv@vger.kernel.org>,
        Haiyang Zhang <haiyangz@microsoft.com>,
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        <driverdev-devel@linuxdriverproject.org>,
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        vkuznets <vkuznets@redhat.com>,
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Subject: Re: [PATCH 0/3] pci-hyperv: fix memory leak and add
 pci_destroy_slot()
Message-ID: <20190305102733.30e25dae@shemminger-XPS-13-9360>
In-Reply-To: <20190304213357.16652-1-decui@microsoft.com>
References: <20190304213357.16652-1-decui@microsoft.com>
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On Mon, 4 Mar 2019 21:34:47 +0000
Dexuan Cui <decui@microsoft.com> wrote:

> Patch #1 fixes a memory leak caused by incorrectly-maintained hpdev->refs.
> 
> Patch #2 and #3 make sure the "slot" is removed in all the scenarios.
> Without them, in the quick hot-add/hot-remove test, systemd-dev may easily
> crash when trying to access a dangling sys file in /sys/bus/pci/slots/:
> "BUG: unable to handle kernel paging request".
> 
> BTW, Patch #2 was posted on Feb 7, 2019, and this is the v2: the change
> to hv_eject_device_work() in v1 is removed, as the change is only needed
> when we hot-remove the device and remove the pci-hyperv driver at the 
> same time. It looks more work is required to make this scenaro work
> correctly, and since removing the driver is not really a "usual" usage,
> we can address this scenario in the future.
> 
> Please review the patchset.
> 
> Dexuan Cui (3):
>   PCI: hv: Fix a memory leak in hv_eject_device_work()
>   PCI: hv: Add hv_pci_remove_slots() when we unload the driver
>   PCI: hv: Add pci_destroy_slot() in pci_devices_present_work(), if
>     necessary
> 
>  drivers/pci/controller/pci-hyperv.c | 23 +++++++++++++++++++++++
>  1 file changed, 23 insertions(+)


Thanks for fixing this.

Reviewed-by: Stephen Hemminger <stephen@networkplumber.org>