On Wed, Dec 08 2021 at 11:29, Jason Gunthorpe wrote:

On Mon, Dec 06, 2021 at 11:27:56PM +0100, Thomas Gleixner wrote:

quoted

 	if (!desc->pci.msi_attrib.can_mask)

It looks like most of the time this is called by an irq_chip, except
for a few special cases list pci_msi_shutdown()

Is this something that should ideally go away someday and use some
lock in the irq_chip - not unlike what we've thought is needed for
IMS?

Some day we'll have that yes.