ARM: 6496/1: GIC: Do not try to register more then NR_IRQS interrupts

This change limits number of GIC-originating interrupts to the
platform maximum (defined by NR_IRQS) while still initialising
all distributor registers.

Signed-off-by: Pawel Moll <pawel.moll@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/common/gic.c b/arch/arm/common/gic.c
index 772f95f1aecddf49ada9ceea0caa5295d22c9613..fea1bd7249b6a26b19cbcfef646b0b0c4d7256cd 100644 (file)
--- a/arch/arm/common/gic.c
+++ b/arch/arm/common/gic.c
@@ -210,7 +210,7 @@ void __init gic_cascade_irq(unsigned int gic_nr, unsigned int irq)
 void __init gic_dist_init(unsigned int gic_nr, void __iomem *base,
                          unsigned int irq_start)
 {
-       unsigned int max_irq, i;
+       unsigned int gic_irqs, irq_limit, i;
        u32 cpumask = 1 << smp_processor_id();
 
        if (gic_nr >= MAX_GIC_NR)
@@ -226,47 +226,49 @@ void __init gic_dist_init(unsigned int gic_nr, void __iomem *base,
 
        /*
         * Find out how many interrupts are supported.
-        */
-       max_irq = readl(base + GIC_DIST_CTR) & 0x1f;
-       max_irq = (max_irq + 1) * 32;
-
-       /*
         * The GIC only supports up to 1020 interrupt sources.
-        * Limit this to either the architected maximum, or the
-        * platform maximum.
         */
-       if (max_irq > max(1020, NR_IRQS))
-               max_irq = max(1020, NR_IRQS);
+       gic_irqs = readl(base + GIC_DIST_CTR) & 0x1f;
+       gic_irqs = (gic_irqs + 1) * 32;
+       if (gic_irqs > 1020)
+               gic_irqs = 1020;
 
        /*
         * Set all global interrupts to be level triggered, active low.
         */
-       for (i = 32; i < max_irq; i += 16)
+       for (i = 32; i < gic_irqs; i += 16)
                writel(0, base + GIC_DIST_CONFIG + i * 4 / 16);
 
        /*
         * Set all global interrupts to this CPU only.
         */
-       for (i = 32; i < max_irq; i += 4)
+       for (i = 32; i < gic_irqs; i += 4)
                writel(cpumask, base + GIC_DIST_TARGET + i * 4 / 4);
 
        /*
         * Set priority on all global interrupts.
         */
-       for (i = 32; i < max_irq; i += 4)
+       for (i = 32; i < gic_irqs; i += 4)
                writel(0xa0a0a0a0, base + GIC_DIST_PRI + i * 4 / 4);
 
        /*
         * Disable all interrupts.  Leave the PPI and SGIs alone
         * as these enables are banked registers.
         */
-       for (i = 32; i < max_irq; i += 32)
+       for (i = 32; i < gic_irqs; i += 32)
                writel(0xffffffff, base + GIC_DIST_ENABLE_CLEAR + i * 4 / 32);
 
+       /*
+        * Limit number of interrupts registered to the platform maximum
+        */
+       irq_limit = gic_data[gic_nr].irq_offset + gic_irqs;
+       if (WARN_ON(irq_limit > NR_IRQS))
+               irq_limit = NR_IRQS;
+
        /*
         * Setup the Linux IRQ subsystem.
         */
-       for (i = irq_start; i < gic_data[gic_nr].irq_offset + max_irq; i++) {
+       for (i = irq_start; i < irq_limit; i++) {
                set_irq_chip(i, &gic_chip);
                set_irq_chip_data(i, &gic_data[gic_nr]);
                set_irq_handler(i, handle_level_irq);