Commit 2c9e7f85 authored by Marc Zyngier's avatar Marc Zyngier Committed by Bjorn Helgaas
Browse files

genirq: Teach handle_simple_irq() to resend an in-progress interrupt 



It appears that the defect outlined in 9c15eeb5 ("genirq: Allow
fasteoi handler to resend interrupts on concurrent handling") also
affects some other less stellar MSI controllers, this time using
the handle_simple_irq() flow.

Teach this flow about irqd_needs_resend_when_in_progress(). Given
the invasive nature of this workaround, only this flow is updated.

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>
Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20250708173404.1278635-2-maz@kernel.org
parent 19272b37

kernel/irq/chip.c

+7 −1
Original line number Diff line number Diff line
@@ -551,7 +551,13 @@ void handle_simple_irq(struct irq_desc *desc) 
{

	guard(raw_spinlock)(&desc->lock);



	if (!irq_can_handle(desc))

	if (!irq_can_handle_pm(desc)) {

		if (irqd_needs_resend_when_in_progress(&desc->irq_data))

			desc->istate |= IRQS_PENDING;

		return;

	}



	if (!irq_can_handle_actions(desc))

		return;



	kstat_incr_irqs_this_cpu(desc);