Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2211797

commit 04bbe863241a9be7d57fb4cf217ee4a72f480e70
Author: Dexuan Cui <decui@microsoft.com>
Date:   Wed Aug 16 10:59:39 2023 -0700

    PCI: hv: Fix a crash in hv_pci_restore_msi_msg() during hibernation

    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.

    Link: https://lore.kernel.org/r/20230816175939.21566-1-decui@microsoft.com


    Fixes: dc2b453290c4 ("PCI: hv: Rework MSI handling")
Signed-off-by: Dexuan Cui <decui@microsoft.com>
Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
Reviewed-by:  <sathyanarayanan.kuppuswamy@linux.intel.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
    Cc: stable@vger.kernel.org

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>