PCI MSI: Use mask_pos instead of mask_base when appropriate

MSI interrupts have a mask_pos where MSI-X have a mask_base.  Use a
transparent union to get rid of some ugly casts.

Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/include/linux/msi.h b/include/linux/msi.h
index 9c5ce214fbf4..5025ca4d91e4 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -33,7 +33,10 @@ struct msi_desc {
         unsigned int irq;
         struct list_head list;
 
-        void __iomem *mask_base;
+        union {
+                void __iomem *mask_base;
+                u8 mask_pos;
+        };
         struct pci_dev *dev;
 
         /* Last set MSI message */