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irqchip/exynos-combiner: Switch to raw_spinlock

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The exynos-combiner driver uses a regular spinlock to protect access to
the combiner interrupt status register in combiner_handle_cascade_irq(),
which is invoked in hard interrupt context as a chained interrupt handler.

When PREEMPT_RT is enabled on ARM, regular spinlock is converted to a
sleeping lock (mutex-based), which must not be used in atomic context
such as hard interrupt handlers.

Switch the irq_controller_lock to raw_spinlock, which remains a true
non-sleeping spinlock even under PREEMPT_RT.

Fixes: a900e5d997 ("ARM: exynos: move exynos4210-combiner to drivers/irqchip")
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
This commit is contained in:
Marek Szyprowski 2026-05-21 00:04:22 +02:00 committed by Thomas Gleixner
parent 91840be8f7
commit 96031b31a4
1 changed files with 3 additions and 3 deletions
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6
drivers/irqchip/exynos-combiner.c
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@ -24,7 +24,7 @@
#define IRQ_IN_COMBINER 8
static DEFINE_SPINLOCK(irq_controller_lock);
static DEFINE_RAW_SPINLOCK(irq_controller_lock);
struct combiner_chip_data {
unsigned int hwirq_offset;
@ -72,9 +72,9 @@ static void combiner_handle_cascade_irq(struct irq_desc *desc)
chained_irq_enter(chip, desc);
spin_lock(&irq_controller_lock);
raw_spin_lock(&irq_controller_lock);
status = readl_relaxed(chip_data->base + COMBINER_INT_STATUS);
spin_unlock(&irq_controller_lock);
raw_spin_unlock(&irq_controller_lock);
status &= chip_data->irq_mask;
if (status == 0)