RE: [PATCH v2] PCI: hv: Fix a crash in hv_pci_restore_msi_msg() during hibernation

[Dexuan Cui]

> From: Dexuan Cui <decui@xxxxxxxxxxxxx>
> Sent: Wednesday, August 16, 2023 11:00 AM
>  [...]
> When a Linux VM with an assigned PCI device runs on Hyper-V, if the PCI
> device driver is not loaded yet (i.e. MSI-X/MSI is not enabled on the
> device yet), doing a VM hibernation triggers a panic in
> hv_pci_restore_msi_msg() -> msi_lock_descs(&pdev->dev), because
> pdev->dev.msi.data is still NULL.
> 
> Avoid the panic by checking if MSI-X/MSI is enabled.
> 
> Fixes: dc2b453290c4 ("PCI: hv: Rework MSI handling")
> Signed-off-by: Dexuan Cui <decui@xxxxxxxxxxxxx>

Sorry, I forgot to add 
Cc: stable@xxxxxxxxxxxxxxx