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

Haiyang Zhang
2017-04-20T16:35:23Z

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