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| author |   Gavin Shan <gwshan@linux.vnet.ibm.com> | 2014-05-30 11:35:54 -0600 |
|---|---|---|
| committer |   Alex Williamson <alex.williamson@redhat.com> | 2014-05-30 11:35:54 -0600 |
| commit | fd49c81f080a997aad4b0e73541cd42772b6a772 (patch) | |
| tree | 280bab4ea61a5a99ec2fcf0199ba7adc41eeacd8 /drivers/vfio | |
| parent | drivers/vfio: Rework offsetofend() (diff) | |
| download | linux-dev-fd49c81f080a997aad4b0e73541cd42772b6a772.tar.xz linux-dev-fd49c81f080a997aad4b0e73541cd42772b6a772.zip | |
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>
Diffstat (limited to 'drivers/vfio')
| -rw-r--r-- | drivers/vfio/pci/vfio_pci.c | 3 |
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; |