linux-kernel - [PATCH v1 char-misc-linus 1/2] misc: microchip: pci1xxxx: Resolve kernel panic during GPIO IRQ handling

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Message-ID: <20241205133626.1483499-2-rengarajan.s@microchip.com>
Date: Thu, 5 Dec 2024 19:06:25 +0530
From: Rengarajan S <rengarajan.s@...rochip.com>
To: <vaibhaavram.tl@...rochip.com>, <kumaravel.thiagarajan@...rochip.com>,
	<arnd@...db.de>, <gregkh@...uxfoundation.org>, <linux-gpio@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <unglinuxdriver@...rochip.com>
CC: <rengarajan.s@...rochip.com>
Subject: [PATCH v1 char-misc-linus 1/2] misc: microchip: pci1xxxx: Resolve kernel panic during GPIO IRQ handling

Resolve kernel panic caused by improper handling of IRQs while
accessing GPIO values. This is done by replacing generic_handle_irq with
handle_nested_irq.

Fixes: 1f4d8ae231f4 ("misc: microchip: pci1xxxx: Add gpio irq handler and irq helper functions irq_ack, irq_mask, irq_unmask and irq_set_type of irq_chip.") 
Signed-off-by: Rengarajan S <rengarajan.s@...rochip.com>
---
 drivers/misc/mchp_pci1xxxx/mchp_pci1xxxx_gpio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/misc/mchp_pci1xxxx/mchp_pci1xxxx_gpio.c b/drivers/misc/mchp_pci1xxxx/mchp_pci1xxxx_gpio.c
index e616e3ec2b42..558290bdb938 100644
--- a/drivers/misc/mchp_pci1xxxx/mchp_pci1xxxx_gpio.c
+++ b/drivers/misc/mchp_pci1xxxx/mchp_pci1xxxx_gpio.c
@@ -277,7 +277,7 @@ static irqreturn_t pci1xxxx_gpio_irq_handler(int irq, void *dev_id)
 			writel(BIT(bit), priv->reg_base + INTR_STATUS_OFFSET(gpiobank));
 			spin_unlock_irqrestore(&priv->lock, flags);
 			irq = irq_find_mapping(gc->irq.domain, (bit + (gpiobank * 32)));
-			generic_handle_irq(irq);
+			handle_nested_irq(irq);
 		}
 	}
 	spin_lock_irqsave(&priv->lock, flags);
-- 
2.25.1