> +static irqreturn_t
> +kgdb8250_interrupt(int irq, void *dev_id, struct pt_regs *regs)
> +{
> + char iir;
> +
> + if (irq != KGDB8250_IRQ)
> + return IRQ_NONE;
How can this occur - you gave the IRQ number in the register_irq. WHy
test for it, and if it occurs why not BUG()
> + /*
> + * If there is some other CPU in KGDB then this is a
> + * spurious interrupt. so return without even checking a byte
> + */
> + if (atomic_read(&debugger_active))
> + return IRQ_NONE;
> +
Shared IRQ -> hung box.
Also lose the ugly confusing macros like CURRENTPORT please to follow
kernel style better. In fact why not keep a pointer to the 'current'
uart to get tighter code too ?
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