[PATCH v3] irqchip/tango: Don't use incorrect irq_mask_ack callback

[Marc Gonzalez]

On 25/07/2017 15:08, Marc Gonzalez wrote:

> irq_gc_mask_disable_reg_and_ack() is not equivalent to
> irq_gc_mask_disable_reg() and irq_gc_ack_set_bit().
> 
> Leave the irq_mask_ack callback undefined, and let the irqchip
> framework use irq_mask and irq_ack instead.
> 
> Reported-by: Doug Berger <opendmb at gmail.com>
> Fixes: 4bba66899ac6 ("irqchip/tango: Add support for Sigma Designs SMP86xx/SMP87xx interrupt controller")
> Signed-off-by: Marc Gonzalez <marc_gonzalez at sigmadesigns.com>
> Cc: stable at vger.kernel.org

FWIW, the lockup reported in the thread below disappears
once the patch is applied.

https://lkml.org/lkml/2016/10/21/709

Regards.