[PATCH 6.6.y] irqchip/atmel-aic[5]: Disable interrupts in the irq_pm_shutdown() callbacks

[Sasha Levin <sashal@kernel.org>]

From: Karl Mehltretter <kmehltretter@gmail.com>

[ Upstream commit 0ca21fe111457c843624a835641bb490e704bb2f ]

irq_gc_shutdown() calls the irq_pm_shutdown() callbacks from
syscore_shutdown() with interrupts enabled. aic_pm_shutdown() and
aic5_pm_shutdown() take the generic chip lock with raw_spin_lock(), and
irq_gc_eoi() takes the same lock from the interrupt handler. An
interrupt from the chip while the lock is held spins in irq_gc_eoi()
and hangs the reboot.

Lockdep reports this on every reboot of a SAM9X75 Curiosity board:

  WARNING: inconsistent lock state
  inconsistent {IN-HARDIRQ-W} -> {HARDIRQ-ON-W} usage.
  busybox/101 [HC0[0]:SC0[0]:HE1:SE1] takes:
  c1c2b434 (&gc->lock){?.-.}-{2:2}, at: aic5_pm_shutdown+0x34/0xd8
  {IN-HARDIRQ-W} state was registered at:
    ...
    irq_gc_eoi+0x28/0x60
    handle_fasteoi_irq+0x120/0x214
  ...
   aic5_pm_shutdown from irq_gc_shutdown+0x4c/0x58
   irq_gc_shutdown from syscore_shutdown+0x5c/0x9c
   syscore_shutdown from kernel_restart+0x34/0x78
   kernel_restart from sys_reboot+0x180/0x25c

Use the irqsave guard, as
commit 33517881ede7 ("irqchip/brcmstb-l2: Use _irqsave locking variants in non-interrupt code")
did for brcmstb-l2.

Fixes: b1479ebb7720 ("irqchip: atmel-aic: Add atmel AIC/AIC5 drivers")
Signed-off-by: Karl Mehltretter <kmehltretter@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Assisted-by: LLM
Reviewed-by: Radu Rendec <radu@rendec.net>
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260926004124.88221-1-kmehltretter@gmail.com
[ sashal: Replaced scoped irqsave guards with explicit irq_gc_lock_irqsave()/irq_gc_unlock_irqrestore() pairs using local flags. ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/irqchip/irq-atmel-aic.c  | 5 +++--
 drivers/irqchip/irq-atmel-aic5.c | 5 +++--
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/irqchip/irq-atmel-aic.c b/drivers/irqchip/irq-atmel-aic.c
index 4631f68479537..120ec1ae95d7b 100644
--- a/drivers/irqchip/irq-atmel-aic.c
+++ b/drivers/irqchip/irq-atmel-aic.c
@@ -126,11 +126,12 @@ static void aic_resume(struct irq_data *d)
 static void aic_pm_shutdown(struct irq_data *d)
 {
 	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+	unsigned long flags;
 
-	irq_gc_lock(gc);
+	irq_gc_lock_irqsave(gc, flags);
 	irq_reg_writel(gc, 0xffffffff, AT91_AIC_IDCR);
 	irq_reg_writel(gc, 0xffffffff, AT91_AIC_ICCR);
-	irq_gc_unlock(gc);
+	irq_gc_unlock_irqrestore(gc, flags);
 }
 #else
 #define aic_suspend		NULL
diff --git a/drivers/irqchip/irq-atmel-aic5.c b/drivers/irqchip/irq-atmel-aic5.c
index 145535bd75605..61636866b4916 100644
--- a/drivers/irqchip/irq-atmel-aic5.c
+++ b/drivers/irqchip/irq-atmel-aic5.c
@@ -224,15 +224,16 @@ static void aic5_pm_shutdown(struct irq_data *d)
 	struct irq_domain_chip_generic *dgc = domain->gc;
 	struct irq_chip_generic *bgc = irq_get_domain_generic_chip(domain, 0);
 	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+	unsigned long flags;
 	int i;
 
-	irq_gc_lock(bgc);
+	irq_gc_lock_irqsave(bgc, flags);
 	for (i = 0; i < dgc->irqs_per_chip; i++) {
 		irq_reg_writel(bgc, i + gc->irq_base, AT91_AIC5_SSR);
 		irq_reg_writel(bgc, 1, AT91_AIC5_IDCR);
 		irq_reg_writel(bgc, 1, AT91_AIC5_ICCR);
 	}
-	irq_gc_unlock(bgc);
+	irq_gc_unlock_irqrestore(bgc, flags);
 }
 #else
 #define aic5_suspend		NULL
-- 
2.53.0