[PATCH] PCI/MSI: Set device flag indicating only 32-bit MSI support

[Vidya Sagar]

There are devices (Ex:- Marvell SATA controller) that don't support
64-bit MSIs and the same is advertised through their MSI capability
register. Set no_64bit_msi flag explicitly for such devices in the
MSI setup code so that the msi_verify_entries() API would catch
if the MSI arch code tries to use 64-bit MSI.

Signed-off-by: Vidya Sagar <vid...@nvidia.com>
---
 drivers/pci/msi.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index d52d118979a6..af49da28854e 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -581,10 +581,12 @@ msi_setup_entry(struct pci_dev *dev, int nvec, struct 
irq_affinity *affd)
        entry->msi_attrib.multi_cap     = (control & PCI_MSI_FLAGS_QMASK) >> 1;
        entry->msi_attrib.multiple      = ilog2(__roundup_pow_of_two(nvec));
 
-       if (control & PCI_MSI_FLAGS_64BIT)
+       if (control & PCI_MSI_FLAGS_64BIT) {
                entry->mask_pos = dev->msi_cap + PCI_MSI_MASK_64;
-       else
+       } else {
                entry->mask_pos = dev->msi_cap + PCI_MSI_MASK_32;
+               dev->no_64bit_msi = 1;
+       }
 
        /* Save the initial mask status */
        if (entry->msi_attrib.maskbit)
-- 
2.17.1