From: Nick Chan Date: Sat, 18 Jan 2025 16:31:42 +0000 (+0800) Subject: irqchip/apple-aic: Only handle PMC interrupt as FIQ when configured so X-Git-Tag: v6.1.129~147 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2e432c894863a80e2344b334b792c8ac6a7eb4d2;p=thirdparty%2Fkernel%2Fstable.git irqchip/apple-aic: Only handle PMC interrupt as FIQ when configured so commit 698244bbb3bfd32ddf9a0b70a12b1c7d69056497 upstream. The CPU PMU in Apple SoCs can be configured to fire its interrupt in one of several ways, and since Apple A11 one of the methods is FIQ, but the check of the configuration register fails to test explicitely for FIQ mode. It tests whether the IMODE bitfield is zero or not and the PMCRO_IACT bit is set. That results in false positives when the IMODE bitfield is not zero, but does not have the mode PMCR0_IMODE_FIQ. Only handle the PMC interrupt as a FIQ when the CPU PMU has been configured to fire FIQs, i.e. the IMODE bitfield value is PMCR0_IMODE_FIQ and PMCR0_IACT is set. Fixes: c7708816c944 ("irqchip/apple-aic: Wire PMU interrupts") Signed-off-by: Nick Chan Signed-off-by: Thomas Gleixner Cc: stable@vger.kernel.org Link: https://lore.kernel.org/all/20250118163554.16733-1-towinchenmi@gmail.com Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/irqchip/irq-apple-aic.c b/drivers/irqchip/irq-apple-aic.c index 1c2813ad8bbe2..ba1e4a90ab5fa 100644 --- a/drivers/irqchip/irq-apple-aic.c +++ b/drivers/irqchip/irq-apple-aic.c @@ -555,7 +555,8 @@ static void __exception_irq_entry aic_handle_fiq(struct pt_regs *regs) AIC_FIQ_HWIRQ(AIC_TMR_EL02_VIRT)); } - if (read_sysreg_s(SYS_IMP_APL_PMCR0_EL1) & PMCR0_IACT) { + if ((read_sysreg_s(SYS_IMP_APL_PMCR0_EL1) & (PMCR0_IMODE | PMCR0_IACT)) == + (FIELD_PREP(PMCR0_IMODE, PMCR0_IMODE_FIQ) | PMCR0_IACT)) { int irq; if (cpumask_test_cpu(smp_processor_id(), &aic_irqc->fiq_aff[AIC_CPU_PMU_P]->aff))