irqchip/gic-v3: Handle CPU_PM_ENTER_FAILED correctly

JIRA: https://issues.redhat.com/browse/RHEL-62922

commit 0d62a49
Author: Yogesh Lal <quic_ylal@quicinc.com>
Date: Fri, 20 Dec 2024 15:09:07 +0530

    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: 3708d52 ("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: Charles Mirabile <cmirabil@redhat.com>

Author: Charles Mirabile

drivers/irqchip/irq-gic-v3.c

@@ -1524,7 +1524,7 @@ static int gic_retrigger(struct irq_data *data)
 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_enable();