netdev - RE: [PATCH 6/6] PCI: hv: Use async probing to reduce boot time

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Date:   Wed, 29 Mar 2023 22:42:22 +0000
From:   Dexuan Cui <decui@...rosoft.com>
To:     "Michael Kelley (LINUX)" <mikelley@...rosoft.com>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Jake Oshins <jakeo@...rosoft.com>,
        "kuba@...nel.org" <kuba@...nel.org>, "kw@...ux.com" <kw@...ux.com>,
        KY Srinivasan <kys@...rosoft.com>,
        "leon@...nel.org" <leon@...nel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "lpieralisi@...nel.org" <lpieralisi@...nel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "robh@...nel.org" <robh@...nel.org>,
        "saeedm@...dia.com" <saeedm@...dia.com>,
        "wei.liu@...nel.org" <wei.liu@...nel.org>,
        Long Li <longli@...rosoft.com>,
        "boqun.feng@...il.com" <boqun.feng@...il.com>
CC:     "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH 6/6] PCI: hv: Use async probing to reduce boot time

> From: Michael Kelley (LINUX) <mikelley@...rosoft.com>
> Sent: Wednesday, March 29, 2023 9:55 AM
> 
> From: Dexuan Cui <decui@...rosoft.com>
> >
> > Commit 414428c5da1c ("PCI: hv: Lock PCI bus on device eject") added the
> > pci_lock_rescan_remove() and pci_unlock_rescan_remove() to address the
> > race between create_root_hv_pci_bus() and hv_eject_device_work(), but it
> > doesn't really work well.
> >
> > Now with hbus->state_lock and other fixes, the race is resolved, so
> > remove pci_{lock,unlock}_rescan_remove().
> 
> Commit 414428c5da1c added the calls to pci_lock/unlock_rescan_remove()
> in both create_root_hv_pci_bus() and in hv_eject_device_work().  This
> patch removes the calls only in create_reboot_hv_pci_bus(), but leaves
> them in hv_eject_device_work(), in hv_pci_remove(), and in 
> pci_devices_present_work().
> So evidently it is still needed to provide exclusion for other cases.  Perhaps
> your commit message could clarify that only the exclusion of
> create_root_hv_pci_bus() > is now superfluous because of the
> hbus->state_lock.  And commit 414428c5da1c > isn't fully reverted
> because evidently the lock is still needed in hv_eject_device_work().
> 
> Michael

Thanks! I'll update the commit message in v2.