[linux-yocto] [PATCH 33/57] kernel/irq/manage.c: Fix irq_set_affinity to allow use with buslocks

[Bruce Ashfield]

On 14-03-18 12:56 AM, Charlie Paul wrote:
> From: David Mercado <david.mercado at windriver.com>
>
> Fix irq_set_affinity() to allow usage of buslocks with "slow bus"
> IRQ controllers, such as the LSI Axxia GIC.

This change looks like it should be after patch 35/57, which introduces
the slow bus.

Also in this commit log, we describe the non-working state .. is it a
hang ? A trap ? A lock message ?

Bruce

>
> Signed-off-by: David Mercado <david.mercado at windriver.com>
> ---
>   kernel/irq/manage.c |    6 +++---
>   1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
> index dc4db32..5f14a0f 100644
> --- a/kernel/irq/manage.c
> +++ b/kernel/irq/manage.c
> @@ -195,16 +195,16 @@ int __irq_set_affinity_locked(struct irq_data *data, const struct cpumask *mask)
>    */
>   int irq_set_affinity(unsigned int irq, const struct cpumask *mask)
>   {
> -	struct irq_desc *desc = irq_to_desc(irq);
>   	unsigned long flags;
> +	struct irq_desc *desc = irq_get_desc_buslock(irq, &flags,
> +						     IRQ_GET_DESC_CHECK_GLOBAL);
>   	int ret;
>
>   	if (!desc)
>   		return -EINVAL;
>
> -	raw_spin_lock_irqsave(&desc->lock, flags);
>   	ret =  __irq_set_affinity_locked(irq_desc_get_irq_data(desc), mask);
> -	raw_spin_unlock_irqrestore(&desc->lock, flags);
> +	irq_put_desc_busunlock(desc, flags);
>   	return ret;
>   }
>
>