Public bug reported:
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 <haiya...@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 <haiya...@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
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Confirmed
** Patch added: "0001-pci-hyperv-use-only-16-bit-integer-for-pci-domain.patch"
https://bugs.launchpad.net/bugs/1684971/+attachment/4865622/+files/0001-pci-hyperv-use-only-16-bit-integer-for-pci-domain.patch
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https://bugs.launchpad.net/bugs/1684971
Title:
[Hyper-V][SAUCE] pci-hyperv: Use only 16 bit integer for PCI domain
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