[PATCH] regmap-irq: allow auto-allocated IRQs to be mapped

[Opensource]

if the irq_base is set to -1 when calling regmap_add_irq_chip()
then allow the IRQ to be mapped even if the allocated irq_base
is actually zero.

This restores the behaviour seen in v3.4, and I assume that the
tidy-ups just made in v3.5 INADVERTENTLY introduce this change
in behaviour.

Signed-off-by: Anthony Olech (Opensource) <anthony.olech.opensou...@diasemi.com>
---
 drivers/base/regmap/regmap-irq.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/base/regmap/regmap-irq.c b/drivers/base/regmap/regmap-irq.c
index a897346..2441785 100644
--- a/drivers/base/regmap/regmap-irq.c
+++ b/drivers/base/regmap/regmap-irq.c
@@ -238,6 +238,7 @@ int regmap_add_irq_chip(struct regmap *map, int irq, int 
irq_flags,
        struct regmap_irq_chip_data *d;
        int i;
        int ret = -ENOMEM;
+       int orig_irq_base = irq_base;
 
        for (i = 0; i < chip->num_irqs; i++) {
                if (chip->irqs[i].reg_offset % map->reg_stride)
@@ -313,7 +314,7 @@ int regmap_add_irq_chip(struct regmap *map, int irq, int 
irq_flags,
                }
        }
 
-       if (irq_base)
+       if (irq_base || orig_irq_base)
                d->domain = irq_domain_add_legacy(map->dev->of_node,
                                                  chip->num_irqs, irq_base, 0,
                                                  &regmap_domain_ops, d);
-- 
end-of-patch for regmap-irq-bug-fix

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