On 10/28/2014 08:58 PM, Kevin Cernekee wrote:
> This check may be prone to race conditions, e.g.
>
> 1) Some external event (e.g. GPIO level) causes an IRQ to become pending
> 2) Peripheral asserts the L2 IRQ
> 3) CPU takes an interrupt
> 4) The event from #1 goes away
> 5) bcm7120_l2_intc_irq_handle() reads back a 0 status
>
> Unlike the hardware supported by brcmstb-l2, the bcm7120-l2 controller
> does not latch the IRQ status. Bits can change if the inputs to the
> controller change. Also, do_bad_IRQ() is an ARM-specific macro.
>
> So let's just nuke it.
>
> Signed-off-by: Kevin Cernekee <cerne...@gmail.com>
Acked-by: Florian Fainelli <f.faine...@gmail.com>
> ---
> drivers/irqchip/irq-bcm7120-l2.c | 9 ---------
> 1 file changed, 9 deletions(-)
>
> diff --git a/drivers/irqchip/irq-bcm7120-l2.c
> b/drivers/irqchip/irq-bcm7120-l2.c
> index b9f4fb8..49d8f3d 100644
> --- a/drivers/irqchip/irq-bcm7120-l2.c
> +++ b/drivers/irqchip/irq-bcm7120-l2.c
> @@ -27,8 +27,6 @@
>
> #include "irqchip.h"
>
> -#include <asm/mach/irq.h>
> -
> /* Register offset in the L2 interrupt controller */
> #define IRQEN 0x00
> #define IRQSTAT 0x04
> @@ -51,19 +49,12 @@ static void bcm7120_l2_intc_irq_handle(unsigned int irq,
> struct irq_desc *desc)
> chained_irq_enter(chip, desc);
>
> status = __raw_readl(b->base + IRQSTAT);
> -
> - if (status == 0) {
> - do_bad_IRQ(irq, desc);
> - goto out;
> - }
> -
> do {
> irq = ffs(status) - 1;
> status &= ~(1 << irq);
> generic_handle_irq(irq_find_mapping(b->domain, irq));
> } while (status);
>
> -out:
> chained_irq_exit(chip, desc);
> }
>
>
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