6.6-stable review patch. If anyone has any objections, please let me know.
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From: Inochi Amaoto inochiama@gmail.com
[ Upstream commit adecf78df945f4c7a1d29111b0002827f487df51 ]
plic_set_affinity() always calls plic_irq_enable(), which clears up the priority setting even the interrupt is only masked. This unmasks the interrupt unexpectly.
Replace the plic_irq_enable/disable() with plic_irq_toggle() to avoid changing the priority setting.
Suggested-by: Thomas Gleixner tglx@linutronix.de Signed-off-by: Inochi Amaoto inochiama@gmail.com Signed-off-by: Thomas Gleixner tglx@linutronix.de Tested-by: Nam Cao namcao@linutronix.de # VisionFive 2 Tested-by: Chen Wang unicorn_wang@outlook.com # Pioneerbox Reviewed-by: Nam Cao namcao@linutronix.de Reviewed-by: Chen Wang unicorn_wang@outlook.com Link: https://lore.kernel.org/all/20250811002633.55275-1-inochiama@gmail.com Link: https://lore.kernel.org/lkml/20250722224513.22125-1-inochiama@gmail.com/ Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/irqchip/irq-sifive-plic.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/irqchip/irq-sifive-plic.c b/drivers/irqchip/irq-sifive-plic.c index 2d20cf9d84cea..a8f5cfad16f7d 100644 --- a/drivers/irqchip/irq-sifive-plic.c +++ b/drivers/irqchip/irq-sifive-plic.c @@ -176,12 +176,14 @@ static int plic_set_affinity(struct irq_data *d, if (cpu >= nr_cpu_ids) return -EINVAL;
- plic_irq_disable(d); + /* Invalidate the original routing entry */ + plic_irq_toggle(irq_data_get_effective_affinity_mask(d), d, 0);
irq_data_update_effective_affinity(d, cpumask_of(cpu));
+ /* Setting the new routing entry if irq is enabled */ if (!irqd_irq_disabled(d)) - plic_irq_enable(d); + plic_irq_toggle(irq_data_get_effective_affinity_mask(d), d, 1);
return IRQ_SET_MASK_OK_DONE; }