[PATCH] irqchip/irq-brcmstb-l2: Avoid saving mask on shutdown

Florian Fainelli florian.fainelli at broadcom.com
Tue Apr 16 12:43:42 PDT 2024


The interrupt controller shutdown path does not need to save the mask of
enabled interrupts because the next state the system is going to be in
is akin to a cold boot, or a kexec'd kernel.

Reported-by: Tim Ross <tim.ross at broadcom.com>
Signed-off-by: Florian Fainelli <florian.fainelli at broadcom.com>
---
 drivers/irqchip/irq-brcmstb-l2.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/irqchip/irq-brcmstb-l2.c b/drivers/irqchip/irq-brcmstb-l2.c
index 2b0b3175cea0..c988886917f7 100644
--- a/drivers/irqchip/irq-brcmstb-l2.c
+++ b/drivers/irqchip/irq-brcmstb-l2.c
@@ -118,7 +118,7 @@ static void brcmstb_l2_intc_irq_handle(struct irq_desc *desc)
 	chained_irq_exit(chip, desc);
 }
 
-static void brcmstb_l2_intc_suspend(struct irq_data *d)
+static void __brcmstb_l2_intc_suspend(struct irq_data *d, bool save)
 {
 	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
 	struct irq_chip_type *ct = irq_data_get_chip_type(d);
@@ -127,7 +127,8 @@ static void brcmstb_l2_intc_suspend(struct irq_data *d)
 
 	irq_gc_lock_irqsave(gc, flags);
 	/* Save the current mask */
-	b->saved_mask = irq_reg_readl(gc, ct->regs.mask);
+	if (save)
+		b->saved_mask = irq_reg_readl(gc, ct->regs.mask);
 
 	if (b->can_wake) {
 		/* Program the wakeup mask */
@@ -137,6 +138,16 @@ static void brcmstb_l2_intc_suspend(struct irq_data *d)
 	irq_gc_unlock_irqrestore(gc, flags);
 }
 
+static void brcmstb_l2_intc_shutdown(struct irq_data *d)
+{
+	__brcmstb_l2_intc_suspend(d, false);
+}
+
+static void brcmstb_l2_intc_suspend(struct irq_data *d)
+{
+	__brcmstb_l2_intc_suspend(d, true);
+}
+
 static void brcmstb_l2_intc_resume(struct irq_data *d)
 {
 	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
@@ -252,7 +263,7 @@ static int __init brcmstb_l2_intc_of_init(struct device_node *np,
 
 	ct->chip.irq_suspend = brcmstb_l2_intc_suspend;
 	ct->chip.irq_resume = brcmstb_l2_intc_resume;
-	ct->chip.irq_pm_shutdown = brcmstb_l2_intc_suspend;
+	ct->chip.irq_pm_shutdown = brcmstb_l2_intc_shutdown;
 
 	if (data->can_wake) {
 		/* This IRQ chip can wake the system, set all child interrupts
-- 
2.34.1




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