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| author | Russell King <rmk@dyn-67.arm.linux.org.uk> | 2007-05-17 10:11:34 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2007-05-17 10:11:34 +0100 |
| commit | 0f347bb9136f55ff575d55441a29e92c16e87fb0 (patch) | |
| tree | 82dfc12a5178e33e26324bb3da621e40576e0879 /arch/arm/common | |
| parent | f3270f6ef7d60251617f9d4c08f76ec01c647aa4 (diff) | |
| download | linux-0f347bb9136f55ff575d55441a29e92c16e87fb0.tar.bz2 | |
[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: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/common')
| -rw-r--r-- | arch/arm/common/gic.c | 20 |
1 files changed, 9 insertions, 11 deletions
diff --git a/arch/arm/common/gic.c b/arch/arm/common/gic.c index 4deece5fbdf4..2ae0bd1c907d 100644 --- a/arch/arm/common/gic.c +++ b/arch/arm/common/gic.c @@ -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 */ @@ -140,16 +139,15 @@ 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; - generic_handle_irq(cascade_irq); + 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: /* primary controller unmasking */ |