linux-kernel - [PATCH] PCI: hv: fix bus domain ID corruption

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Date:   Fri, 9 Mar 2018 05:02:34 +0000
From:   Sridhar Pitchai <Sridhar.Pitchai@...rosoft.com>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jake Oshins <jakeo@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Dexuan Cui <decui@...rosoft.com>
CC:     KY Srinivasan <kys@...rosoft.com>,
        "devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] PCI: hv: fix bus domain ID corruption

When PCI BUS is added, PCI_BUS domain ID is set. When PCI_BUS and a device
added to the bus is racing against each other, the first device tends to
overwrite the domain ID. In order to avoid the race, this patch make sure
when a device is added to a bus, it never updated the bus domain ID. Since
we have the transparent SRIOV mode now, the short VF device name is no
longer needed.

Fixes: 4a9b0933bdfc("PCI:hv:Use device serial number as PCI domain")
Cc: stable@...r.kernel.org
Signed-off-by: Sridhar Pitchai <srpitcha@...rosoft.com>
---
 drivers/pci/host/pci-hyperv.c | 11 -----------
 1 file changed, 11 deletions(-)

diff --git a/drivers/pci/host/pci-hyperv.c b/drivers/pci/host/pci-hyperv.c
index 2faf38e..ac67e56 100644
--- a/drivers/pci/host/pci-hyperv.c
+++ b/drivers/pci/host/pci-hyperv.c
@@ -1518,17 +1518,6 @@ static struct hv_pci_dev *new_pcichild_device(struct hv_pcibus_device *hbus,
 	get_pcichild(hpdev, hv_pcidev_ref_childlist);
 	spin_lock_irqsave(&hbus->device_list_lock, flags);
 
-	/*
-	 * When a device is being added to the bus, we set the PCI domain
-	 * number to be the device serial number, which is non-zero and
-	 * unique on the same VM.  The serial numbers start with 1, and
-	 * increase by 1 for each device.  So device names including this
-	 * can have shorter names than based on the bus instance UUID.
-	 * Only the first device serial number is used for domain, so the
-	 * domain number will not change after the first device is added.
-	 */
-	if (list_empty(&hbus->children))
-		hbus->sysdata.domain = desc->ser;
 	list_add_tail(&hpdev->list_entry, &hbus->children);
 	spin_unlock_irqrestore(&hbus->device_list_lock, flags);
 	return hpdev;
-- 
2.7.4