5.4-stable review patch. If anyone has any objections, please let me know.
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From: Yogesh Lal quic_ylal@quicinc.com
commit 0d62a49ab55c99e8deb4593b8d9f923de1ab5c18 upstream.
When a CPU attempts to enter low power mode, it disables the redistributor and Group 1 interrupts and reinitializes the system registers upon wakeup.
If the transition into low power mode fails, then the CPU_PM framework invokes the PM notifier callback with CPU_PM_ENTER_FAILED to allow the drivers to undo the state changes.
The GIC V3 driver ignores CPU_PM_ENTER_FAILED, which leaves the GIC in disabled state.
Handle CPU_PM_ENTER_FAILED in the same way as CPU_PM_EXIT to restore normal operation.
[ tglx: Massage change log, add Fixes tag ]
Fixes: 3708d52fc6bb ("irqchip: gic-v3: Implement CPU PM notifier") Signed-off-by: Yogesh Lal quic_ylal@quicinc.com Signed-off-by: Thomas Gleixner tglx@linutronix.de Acked-by: Marc Zyngier maz@kernel.org Cc: stable@vger.kernel.org Link: https://lore.kernel.org/all/20241220093907.2747601-1-quic_ylal@quicinc.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/irqchip/irq-gic-v3.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/irqchip/irq-gic-v3.c +++ b/drivers/irqchip/irq-gic-v3.c @@ -1185,7 +1185,7 @@ static int gic_set_affinity(struct irq_d static int gic_cpu_pm_notifier(struct notifier_block *self, unsigned long cmd, void *v) { - if (cmd == CPU_PM_EXIT) { + if (cmd == CPU_PM_EXIT || cmd == CPU_PM_ENTER_FAILED) { if (gic_dist_security_disabled()) gic_enable_redist(true); gic_cpu_sys_reg_init();