commit
04bbe863241a9be7d57fb4cf217ee4a72f480e70 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: 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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
struct msi_desc *entry;
int ret = 0;
+ if (!pdev->msi_enabled && !pdev->msix_enabled)
+ return 0;
+
msi_lock_descs(&pdev->dev);
msi_for_each_desc(entry, &pdev->dev, MSI_DESC_ASSOCIATED) {
irq_data = irq_get_irq_data(entry->irq);