target/linux/atheros/patches-3.8/001-get_c0_compare_int_fix.patch

   1 Fix the usage of get_c0_compare_int: override cp0_compare_irq if the returned
   2 value is in the MIPS CPU IRQ range to ensure that c0_compare_int_usable()
   3 still works.
   4
   5 Signed-off-by: Felix Fietkau <nbd@openwrt.org>
   6
   7 --- a/arch/mips/kernel/cevt-r4k.c
   8 +++ b/arch/mips/kernel/cevt-r4k.c
   9 @@ -173,20 +173,23 @@ int __cpuinit r4k_clockevent_init(void)
  10         struct clock_event_device *cd;
  11         unsigned int irq;
  12
  13 -       if (!cpu_has_counter || !mips_hpt_frequency)
  14 -               return -ENXIO;
  15 -
  16 -       if (!c0_compare_int_usable())
  17 -               return -ENXIO;
  18 -
  19         /*
  20          * With vectored interrupts things are getting platform specific.
  21          * get_c0_compare_int is a hook to allow a platform to return the
  22          * interrupt number of it's liking.
  23          */
  24         irq = MIPS_CPU_IRQ_BASE + cp0_compare_irq;
  25 -       if (get_c0_compare_int)
  26 +       if (get_c0_compare_int) {
  27                 irq = get_c0_compare_int();
  28 +               if ((irq >= MIPS_CPU_IRQ_BASE) && (irq < MIPS_CPU_IRQ_BASE + 8))
  29 +                       cp0_compare_irq = irq - MIPS_CPU_IRQ_BASE;
  30 +       }
  31 +
  32 +       if (!cpu_has_counter || !mips_hpt_frequency)
  33 +               return -ENXIO;
  34 +
  35 +       if (!c0_compare_int_usable())
  36 +               return -ENXIO;
  37
  38         cd = &per_cpu(mips_clockevent_device, cpu);
  39