PCI: msi: Disable msi interrupts when we initialize a pci device

I traced a nasty kexec on panic boot failure to the fact that we had
screaming msi interrupts and we were not disabling the msi messages at
kernel startup.  The booting kernel had not enabled those interupts so
was not prepared to handle them.

I can see no reason why we would ever want to leave the msi interrupts
enabled at boot if something else has enabled those interrupts.  The pci
spec specifies that msi interrupts should be off by default.  Drivers
are expected to enable the msi interrupts if they want to use them.  Our
interrupt handling code reprograms the interrupt handlers at boot and
will not be be able to do anything useful with an unexpected interrupt.

This patch applies cleanly all of the way back to 2.6.32 where I noticed
the problem.

Cc: stable@kernel.org
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index e6b6b9c67023ecc4a24a5d0baaa60c4ef4e4566e..337e16ab4a92ba3cde34b53b220b61d9191b4658 100644 (file)
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -981,5 +981,15 @@ EXPORT_SYMBOL(pci_msi_enabled);
 
 void pci_msi_init_pci_dev(struct pci_dev *dev)
 {
+       int pos;
        INIT_LIST_HEAD(&dev->msi_list);
+
+       /* Disable the msi hardware to avoid screaming interrupts
+        * during boot.  This is the power on reset default so
+        * usually this should be a noop.
+        */
+       pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
+       if (pos)
+               msi_set_enable(dev, pos, 0);
+       msix_set_enable(dev, 0);
 }