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- Make sure GICv3 controller interrupt activation doesn't race with

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a concurrent deactivation due to propagation delays of the register
   write
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Merge tag 'irq_urgent_for_v6.12_rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull irq fix from Borislav Petkov:

 - Make sure GICv3 controller interrupt activation doesn't race with a
   concurrent deactivation due to propagation delays of the register
   write

* tag 'irq_urgent_for_v6.12_rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  irqchip/gic-v3: Force propagation of the active state with a read-back
This commit is contained in:
Linus Torvalds 2024-11-10 09:37:47 -08:00
commit a9cda7c0ff
1 changed files with 7 additions and 0 deletions
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7
drivers/irqchip/irq-gic-v3.c
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@ -524,6 +524,13 @@ static int gic_irq_set_irqchip_state(struct irq_data *d,
} }
gic_poke_irq(d, reg); gic_poke_irq(d, reg);
/*
* Force read-back to guarantee that the active state has taken
* effect, and won't race with a guest-driven deactivation.
*/
if (reg == GICD_ISACTIVER)
gic_peek_irq(d, reg);
return 0; return 0;
} }