PCI: hv: Fix a crash in hv_pci_restore_msi_msg() during hibernation
commit 04bbe863 upstream. 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: dc2b4532 ("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:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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4443f369
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