PCI: Disable AER with pci=nomsi

When booting with pci=nomsi aer causes lost interrupts and
lockdep inversions.

So check if MSIs are not disabled before initializing the aer
driver.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/pci/pcie/aer/aerdrv.c b/drivers/pci/pcie/aer/aerdrv.c
index 10c0e62bd5a8..2ce8f9ccc66e 100644
--- a/drivers/pci/pcie/aer/aerdrv.c
+++ b/drivers/pci/pcie/aer/aerdrv.c
@@ -318,6 +318,8 @@ static int __init aer_service_init(void)
 {
         if (pcie_aer_disable)
                 return -ENXIO;
+        if (!pci_msi_enabled())
+                return -ENXIO;
         return pcie_port_service_register(&aerdriver);
 }