drivers/vfio/pci: Fix wrong MSI interrupt count

According PCI local bus specification, the register of Message
Control for MSI (offset: 2, length: 2) has bit#0 to enable or
disable MSI logic and it shouldn't be part contributing to the
calculation of MSI interrupt count. The patch fixes the issue.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

1 files changed, 1 insertions, 2 deletions

diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
index 85063f1c12d7..010e0f8b8e4f 100644
--- a/drivers/vfio/pci/vfio_pci.c
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -197,8 +197,7 @@ static int vfio_pci_get_irq_count(struct vfio_pci_device *vdev, int irq_type)
                 if (pos) {
                         pci_read_config_word(vdev->pdev,
                                              pos + PCI_MSI_FLAGS, &flags);
-
-                        return 1 << (flags & PCI_MSI_FLAGS_QMASK);
+                        return 1 << ((flags & PCI_MSI_FLAGS_QMASK) >> 1);
                 }
         } else if (irq_type == VFIO_PCI_MSIX_IRQ_INDEX) {
                 u8 pos;