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[Launchpad Bug Tracker <1684971@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 4.4.0-77.98

---------------
linux (4.4.0-77.98) xenial; urgency=low

  * linux: 4.4.0-77.98 -proposed tracker (LP: #1686040)

  * [Hyper-V][SAUCE] pci-hyperv: Use only 16 bit integer for PCI domain
    (LP: #1684971)
    - SAUCE: pci-hyperv: Use only 16 bit integer for PCI domain

  * Upgrade Redpine WLAN/BT driver to ver. 1.2.RC4 (LP: #1669672)
    - SAUCE: sdhci: use PCI ID to identify Dell IoT gateways
    - SAUCE: Redpine: Upgrade to ver. 1.2.RC4
    - [Config] Update CONFIG_VEN_RSI_* configs
    - SAUCE: Redpine: add copyright to kernel packages

  * Fix RX fail issue on Exar USB serial driver after resume from S3/S4
    (LP: #1685133)
    - SAUCE: xr-usb-serial: Update driver for Exar USB serial ports

  * Miscellaneous Ubuntu changes
    - [Config] updating configs to match redpine driver changes

 -- Kleber Sacilotto de Souza <kleber.souza@xxxxxxxxxxxxx>  Tue, 25 Apr
2017 19:32:01 +0200

** Changed in: linux (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

** Changed in: linux (Ubuntu Yakkety)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1684971

Title:
  [Hyper-V][SAUCE] pci-hyperv: Use only 16 bit integer for PCI domain

Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Xenial:
  Fix Released
Status in linux source package in Yakkety:
  Fix Released
Status in linux source package in Zesty:
  Fix Committed
Status in linux source package in Artful:
  Fix Committed

Bug description:
  The following patch fixes a problem with "[PATCH] pci-hyperv: Use
  device serial number as PCI domain" where some drivers were expecting
  a u16 instead of a u32 for PCI device serial numbers, as observed by
  Oops and hangs in Azure on NC and NV GPU instances.

  From: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>

  This patch uses the lower 16 bits of the serial number as PCI
  domain, otherwise some drivers may not be able to handle it.

  Signed-off-by: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>
  ---
   drivers/pci/host/pci-hyperv.c |    4 +++-
   1 files changed, 3 insertions(+), 1 deletions(-)

  diff --git a/drivers/pci/host/pci-hyperv.c b/drivers/pci/host/pci-hyperv.c
  index e73880c..b18dff3 100644
  --- a/drivers/pci/host/pci-hyperv.c
  +++ b/drivers/pci/host/pci-hyperv.c
  @@ -1334,9 +1334,11 @@ static void put_pcichild(struct hv_pci_dev *hpdev,
   	 * 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.
  +	 * The lower 16 bits of the serial number is used, otherwise some
  +	 * drivers may not be able to handle it.
   	 */
   	if (list_empty(&hbus->children))
  -		hbus->sysdata.domain = desc->ser;
  +		hbus->sysdata.domain = desc->ser & 0xFFFF;
   	list_add_tail(&hpdev->list_entry, &hbus->children);
   	spin_unlock_irqrestore(&hbus->device_list_lock, flags);
   	return hpdev;
  -- 
  1.7.1

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