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misc: microchip: pci1xxxx: Fix Kernel panic during IRQ handler registration

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commit 18eb77c75ed01439f96ae5c0f33461eb5134b907 upstream.

Resolve kernel panic while accessing IRQ handler associated with the
generated IRQ. This is done by acquiring the spinlock and storing the
current interrupt state before handling the interrupt request using
generic_handle_irq.

A previous fix patch was submitted where 'generic_handle_irq' was
replaced with 'handle_nested_irq'. However, this change also causes
the kernel panic where after determining which GPIO triggered the
interrupt and attempting to call handle_nested_irq with the mapped
IRQ number, leads to a failure in locating the registered handler.

Fixes: 194f9f94a516 ("misc: microchip: pci1xxxx: Resolve kernel panic during GPIO IRQ handling")
Cc: stable <stable@kernel.org>
Signed-off-by: Rengarajan S <rengarajan.s@microchip.com>
Link: https://lore.kernel.org/r/20250313170856.20868-2-rengarajan.s@microchip.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Rengarajan S
2025-03-13 22:38:55 +05:30
committed by Greg Kroah-Hartman
parent 5f253cc40e
commit 62957f58ab
1 changed files with 5 additions and 1 deletions
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6
drivers/misc/mchp_pci1xxxx/mchp_pci1xxxx_gpio.c
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@@ -37,6 +37,7 @@
struct pci1xxxx_gpio {
struct auxiliary_device *aux_dev;
void __iomem *reg_base;
raw_spinlock_t wa_lock;
struct gpio_chip gpio;
spinlock_t lock;
int irq_base;
@@ -254,6 +255,7 @@ static irqreturn_t pci1xxxx_gpio_irq_handler(int irq, void *dev_id)
struct pci1xxxx_gpio *priv = dev_id;
struct gpio_chip *gc = &priv->gpio;
unsigned long int_status = 0;
unsigned long wa_flags;
unsigned long flags;
u8 pincount;
int bit;
@@ -277,7 +279,9 @@ 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)));
handle_nested_irq(irq);
raw_spin_lock_irqsave(&priv->wa_lock, wa_flags);
generic_handle_irq(irq);
raw_spin_unlock_irqrestore(&priv->wa_lock, wa_flags);
}
}
spin_lock_irqsave(&priv->lock, flags);