Commit 3cc8f625 authored by Marc Zyngier's avatar Marc Zyngier Committed by Bjorn Helgaas
Browse files

PCI: xgene-msi: Resend an MSI racing with itself on a different CPU 



Since changing the affinity of an MSI really is about changing
the target address and that it isn't possible to mask an individual
MSI, it is completely possible for an interrupt to race with itself,
usually resulting in a lost interrupt.

Paper over the design blunder by informing the core code of this
sad state of affairs.

Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
Signed-off-by: default avatarLorenzo Pieralisi <lpieralisi@kernel.org>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Link: https://lore.kernel.org/r/20250708173404.1278635-11-maz@kernel.org
parent 17c1f960

drivers/pci/controller/pci-xgene-msi.c

+1 −0
Original line number Diff line number Diff line
@@ -183,6 +183,7 @@ static int xgene_irq_domain_alloc(struct irq_domain *domain, unsigned int virq, 
	irq_domain_set_info(domain, virq, hwirq,

			    &xgene_msi_bottom_irq_chip, domain->host_data,

			    handle_simple_irq, NULL, NULL);

	irqd_set_resend_when_in_progress(irq_get_irq_data(virq));



	return 0;

}