Commit 0f347bb9 authored by Russell King's avatar Russell King Committed by Russell King
Browse files

[ARM] gic: Fix gic cascade irq handling 



No need for the cascade irq function to have a "fastcall" annotation.
Fix the range checking for valid IRQ numbers - comparing the value
returned by the GIC with NR_IRQS is meaningless since we translate
the GIC irq number to a Linux IRQ number afterwards.

Check the GIC returned IRQ number is within limits first, then add
the IRQ offset, and only then compare with NR_IRQS.

Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent f3270f6e

arch/arm/common/gic.c

+9 −11
Original line number Diff line number Diff line
@@ -125,12 +125,11 @@ static void gic_set_cpu(unsigned int irq, cpumask_t mask_val) 
}

#endif



static void fastcall gic_handle_cascade_irq(unsigned int irq,

					    struct irq_desc *desc)

static void gic_handle_cascade_irq(unsigned int irq, struct irq_desc *desc)

{

	struct gic_chip_data *chip_data = get_irq_data(irq);

	struct irq_chip *chip = get_irq_chip(irq);

	unsigned int cascade_irq;

	unsigned int cascade_irq, gic_irq;

	unsigned long status;



	/* primary controller ack'ing */
@@ -140,15 +139,14 @@ static void fastcall gic_handle_cascade_irq(unsigned int irq, 
	status = readl(chip_data->cpu_base + GIC_CPU_INTACK);

	spin_unlock(&irq_controller_lock);



	cascade_irq = (status & 0x3ff);

	if (cascade_irq > 1020)

	gic_irq = (status & 0x3ff);

	if (gic_irq == 1023)

		goto out;

	if (cascade_irq < 32 || cascade_irq >= NR_IRQS) {

		do_bad_IRQ(cascade_irq, desc);

		goto out;

	}



	cascade_irq += chip_data->irq_offset;

	cascade_irq = gic_irq + chip_data->irq_offset;

	if (unlikely(gic_irq < 32 || gic_irq > 1020 || cascade_irq >= NR_IRQS))

		do_bad_IRQ(cascade_irq, desc);

	else

		generic_handle_irq(cascade_irq);



 out:

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