[PATCH 1/3][SRU Bionic] UBUNTU: SAUCE: irqchip/gic-v3-its: Add missing return value in its_irq_domain_activate()

[Kleber Souza]

On 11.12.19 22:45, dann frazier wrote:
> From: Sultan Alsawaf <sultan.alsawaf at canonical.com>
> 
> BugLink: https://bugs.launchpad.net/bugs/1853485

Hi Dann,

When a bug number is added to the commit message, it is included on the
package changelog and this is used to track the fix for the issue.

This bug report has been marked as duplicate of LP: #1855059. This is not
an ideal situation because when the bug is marked as duplicate, we lose
the ability to track its fix.

I have reversed the duplication relationship between these two bugs,
that way we don't need to fix the changelog.


Thanks,
Kleber

> 
> The missing return value in its_irq_domain_activate() would cause IRQs
> to be erratically disabled/enabled in unexpected ways on certain Cavium
> boards. This caused all sorts of mayhem since the state of IRQs on each
> CPU would be unpredictable; maybe they'd be enabled, maybe not.
> 
> This bug was introduced by a mismerge of commit d2fd562c0c69
> ("irqchip/gic-v3-its: Don't bind LPI to unavailable NUMA node") over a
> year ago, in Ubuntu-4.15.0-44.47. The missing return value here is
> -EINVAL; add it in to fix the wild breakage.
> 
> Signed-off-by: Sultan Alsawaf <sultan.alsawaf at canonical.com>
> Signed-off-by: dann frazier <dann.frazier at canonical.com>
> ---
>  drivers/irqchip/irq-gic-v3-its.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
> index a9f08d50adc28..5cc27ad2abd19 100644
> --- a/drivers/irqchip/irq-gic-v3-its.c
> +++ b/drivers/irqchip/irq-gic-v3-its.c
> @@ -2407,7 +2407,7 @@ static int its_irq_domain_activate(struct irq_domain *domain,
>  	cpu = cpumask_first_and(cpu_mask, cpu_online_mask);
>  	if (cpu >= nr_cpu_ids) {
>  		if (its_dev->its->flags & ITS_FLAGS_WORKAROUND_CAVIUM_23144)
> -			return;
> +			return -EINVAL;
>  
>  		cpu = cpumask_first(cpu_online_mask);
>  	}
>