[U-Boot] [PATCH] microblaze: avoid interrupt race conditions

[Michal Simek <monstr@monstr.eu>]

Stephan Linz wrote:
> The interrupt acknowledge action have to run after the
> registered interrupt handler. So we have a chance to
> bear out the corresponding interrupt request in the
> corresponding controller hardware.
> 
> With this reordering, we optain a proper interrupt
> handling for level triggered interrupt sources -- for
> example the new axi_timer v1.02.a introduced in ISE 13.2.
> 
> Signed-off-by: Stephan Linz <linz@li-pro.net>
> Acked-by: Michal Simek <monstr@monstr.eu>
> ---
>  arch/microblaze/cpu/interrupts.c |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/microblaze/cpu/interrupts.c b/arch/microblaze/cpu/interrupts.c
> index 5a13211..e7ca859 100644
> --- a/arch/microblaze/cpu/interrupts.c
> +++ b/arch/microblaze/cpu/interrupts.c
> @@ -155,8 +155,6 @@ void interrupt_handler (void)
>  #endif
>  	struct irq_action *act = vecs + irqs;
>  
> -	intc->iar = mask << irqs;
> -
>  #ifdef DEBUG_INT
>  	printf
>  	    ("Jumping to interrupt handler rutine addr %x,count %x,arg %x\n",
> @@ -165,6 +163,8 @@ void interrupt_handler (void)
>  	act->handler (act->arg);
>  	act->count++;
>  
> +	intc->iar = mask << irqs;
> +
>  #ifdef DEBUG_INT
>  	printf ("Dump INTC reg, isr %x, ier %x, iar %x, mer %x\n", intc->isr,
>  		intc->ier, intc->iar, intc->mer);

Applied.

Thanks,
Michal


-- 
Michal Simek, Ing. (M.Eng)
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel 2.6 Microblaze Linux - http://www.monstr.eu/fdt/
Microblaze U-BOOT custodian