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>

1 files changed, 1 insertions, 0 deletions

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
 };