linux-kernel - [PATCH v2]PCI: hv: fix PCI-BUS domainID corruption

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Date:   Wed, 14 Mar 2018 18:05:56 +0000
From:   Sridhar Pitchai <Sridhar.Pitchai@...rosoft.com>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>
CC:     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>,
        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 v2]PCI: hv: fix PCI-BUS domainID corruption

Whenever PCI bus is added, HyperV guarantees the BUS id is unique. Even with
that when a first device is added to the bus, it overrides bus domain ID with
the device serial number. Sometime this can result in BUS ID not being unique.
In this case, when PCI_BUS and a device added to the bus, even before the PCI
BUS is added to kernel, the first device tends to overwrite the domain ID with
0. Since there exists a PCI bus with domain ID 0 already the PCI bus addition
fails. 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>
---

Changes in v2:
* fix the commit comments.
---
 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