On Wed, 20 May 2015, Jiang Liu wrote:
> On 2015/5/20 23:40, Thomas Gleixner wrote:
> > On Wed, 20 May 2015, Jiang Liu wrote:
> >> /* Chained IRQ handler for IPU error interrupt */
> >> -static void ipu_irq_err(unsigned int irq, struct irq_desc *desc)
> >> +static void ipu_irq_err(struct irq_desc *desc)
> >> {
> >> + unsigned int irq = irq_desc_to_irq(desc);
> >
> > Why initializing? It's overwritten in the loop.
> Hi Thomas,
>
> I'm not familiar with the hardware, but if src2map() returns 0
> on the first call, we need to initialize irq. Otherwise
> generic_handle_irq(irq) will use random value on the first call.
> ---------------------------------------------------------
> map = src2map(32 * i + line);
> if (map)
> irq = map->irq;
You omitted the following code:
raw_spin_unlock(&bank_lock);
if (!map) {
pr_err("IPU: Interrupt on unmapped source %u
bank %d\n",
line, i);
continue;
}
So you it does not use irq if map is 0.
Thanks,
tglx
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