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Fix a potential race when disabling MSI/MSI-X on a VMD domain device. If
the VMD interrupt service is running, it may see a disabled IRQ. We can
synchronize RCU just before freeing the MSI descriptor. This is safe since
the irq_desc lock isn't held, and the descriptor is valid even though it is
disabled. After vmd_msi_free(), though, the handler is reinitialized to
handle_bad_irq(), so we can't let the VMD ISR's list iteration see the
disabled IRQ after this.
Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by Jon Derrick: <jonathan.derrick@intel.com>
ee6ee49fd0