MSI: Use a list instead of the custom link structure

The msi descriptors are linked together with what looks a lot like
a linked list, but isn't a struct list_head list. Make it one.

The only complication is that previously we walked a list of irqs, and
got the descriptor for each with get_irq_msi(). Now we have a list of
descriptors and need to get the irq out of it, so it needs to be in the
actual struct msi_desc. We use 0 to indicate no irq is setup.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

2 files changed, 5 insertions, 4 deletions

diff --git a/include/linux/msi.h b/include/linux/msi.h
index d2a200048b22..931e013f1db5 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -1,6 +1,8 @@
 #ifndef LINUX_MSI_H
 #define LINUX_MSI_H
 
+#include <linux/list.h>
+
 struct msi_msg {
         u32     address_lo;     /* low 32 bits of msi message address */
         u32     address_hi;     /* high 32 bits of msi message address */
@@ -24,10 +26,8 @@ struct msi_desc {
                 unsigned default_irq;   /* default pre-assigned irq       */
         }msi_attrib;
 
-        struct {
-                __u16   head;
-                __u16   tail;
-        }link;
+        unsigned int irq;
+        struct list_head list;
 
         void __iomem *mask_base;
         struct pci_dev *dev;
diff --git a/include/linux/pci.h b/include/linux/pci.h
index c02074785d40..d43097dc8672 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -190,6 +190,7 @@ struct pci_dev {
         struct bin_attribute *res_attr[DEVICE_COUNT_RESOURCE]; /* sysfs file for resources */
 #ifdef CONFIG_PCI_MSI
         unsigned int first_msi_irq;
+        struct list_head msi_list;
 #endif
 };