irqchip/gic-v2, v3: Prevent SW resends entirely

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The GIC irqchips can now use a HW resend when a retrigger is invoked by
check_irq_resend(). However, should the HW resend fail, check_irq_resend()
will still attempt to trigger a SW resend, which is still a bad idea for
the GICs.

Prevent this from happening by setting IRQD_HANDLE_ENFORCE_IRQCTX on all
GIC IRQs. Technically per-cpu IRQs do not need this, as their flow handlers
never set IRQS_PENDING, but this aligns all IRQs wrt context enforcement:
this also forces all GIC IRQ handling to happen in IRQ context (as defined
by in_irq()).

Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20200730170321.31228-3-valentin.schneider@arm.com

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Valentin Schneider 2020-07-30 18:03:21 +01:00 • committed by Marc Zyngier

parent 5f774f5e12

commit 1b57d91b96

2 changed files with 9 additions and 2 deletions

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5

drivers/irqchip/irq-gic-v3.c

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6

drivers/irqchip/irq-gic.c

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