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Groups > linux.kernel > #1627665

[PATCH] pci-hyperv: Use only 16 bit integer for PCI domain

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From: Haiyang Zhang <haiyangz@microsoft.com>

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@microsoft.com>
---
 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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[PATCH] pci-hyperv: Use only 16 bit integer for PCI domain Haiyang Zhang <haiyangz@exchange.microsoft.com> - 2017-04-20 18:40 +0200
  RE: [PATCH] pci-hyperv: Use only 16 bit integer for PCI domain Haiyang Zhang <haiyangz@microsoft.com> - 2017-04-20 20:40 +0200
    Re: [PATCH] pci-hyperv: Use only 16 bit integer for PCI domain Christoph Hellwig <hch@infradead.org> - 2017-04-20 21:20 +0200
  Re: [PATCH] pci-hyperv: Use only 16 bit integer for PCI domain Bjorn Helgaas <bhelgaas@google.com> - 2017-04-20 20:40 +0200

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