linux-kernel - RE: [PATCH 3/3] PCI: hv: Add pci_destroy_slot() in pci_devices_present

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Message-ID: <PU1P153MB016935A5D6D203B9E44CEDB2BF420@PU1P153MB0169.APCP153.PROD.OUTLOOK.COM>
Date:   Thu, 21 Mar 2019 00:42:10 +0000
From:   Dexuan Cui <decui@...rosoft.com>
To:     Dexuan Cui <decui@...rosoft.com>,
        Michael Kelley <mikelley@...rosoft.com>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        KY Srinivasan <kys@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
CC:     "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "driverdev-devel@...uxdriverproject.org" 
        <driverdev-devel@...uxdriverproject.org>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        "olaf@...fle.de" <olaf@...fle.de>,
        "apw@...onical.com" <apw@...onical.com>,
        "jasowang@...hat.com" <jasowang@...hat.com>,
        vkuznets <vkuznets@...hat.com>,
        "marcelo.cerri@...onical.com" <marcelo.cerri@...onical.com>,
        "jackm@...lanox.com" <jackm@...lanox.com>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: RE: [PATCH 3/3] PCI: hv: Add pci_destroy_slot() in
 pci_devices_present_work(), if necessary

> From: linux-hyperv-owner@...r.kernel.org
> <linux-hyperv-owner@...r.kernel.org> On Behalf Of Dexuan Cui
> > ...
> > Patch 2 in this series does set it to NULL, but this code does not.
> In Patch2, i.e. in the code path hv_pci_remove() -> hv_pci_remove_slots(),
> we must set hpdev->pci_slot to NULL, otherwise, later, due to
> hv_pci_remove() -> hv_pci_bus_exit() ->
> hv_pci_devices_present() with the zero "relations", we'll double-free the
> "hpdev" struct in pci_devices_present_work() -- see the above.
A minor correction: I meant we'll call pci_destroy_slot(hpdev->pci_slot)
twice, not "double-free hpdev".

Thanks,
-- Dexuan