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Subject[PATCH 1/2] gpio: mxc: need to check return value of irq_alloc_generic_chip
Date
Need to check return value of irq_alloc_generic_chip, because
it may return NULL.
1. Change mxc_gpio_init_gc return type from void to int.
2. Add a new lable out_irqdomain_remove to remove the irq domain
when mxc_gpio_init_gc fail.

Signed-off-by: Peng Fan <van.freenix@gmail.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Alexandre Courbot <gnurou@gmail.com>
---
drivers/gpio/gpio-mxc.c | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/gpio-mxc.c b/drivers/gpio/gpio-mxc.c
index 9f7446a..45bbe729 100644
--- a/drivers/gpio/gpio-mxc.c
+++ b/drivers/gpio/gpio-mxc.c
@@ -339,13 +339,16 @@ static int gpio_set_wake_irq(struct irq_data *d, u32 enable)
return 0;
}

-static void __init mxc_gpio_init_gc(struct mxc_gpio_port *port, int irq_base)
+static int __init mxc_gpio_init_gc(struct mxc_gpio_port *port, int irq_base)
{
struct irq_chip_generic *gc;
struct irq_chip_type *ct;

gc = irq_alloc_generic_chip("gpio-mxc", 1, irq_base,
port->base, handle_level_irq);
+ if (!gc)
+ return -ENOMEM;
+
gc->private = port;

ct = gc->chip_types;
@@ -359,6 +362,8 @@ static void __init mxc_gpio_init_gc(struct mxc_gpio_port *port, int irq_base)

irq_setup_generic_chip(gc, IRQ_MSK(32), IRQ_GC_INIT_NESTED_LOCK,
IRQ_NOREQUEST, 0);
+
+ return 0;
}

static void mxc_gpio_get_hw(struct platform_device *pdev)
@@ -476,12 +481,16 @@ static int mxc_gpio_probe(struct platform_device *pdev)
}

/* gpio-mxc can be a generic irq chip */
- mxc_gpio_init_gc(port, irq_base);
+ err = mxc_gpio_init_gc(port, irq_base);
+ if (err < 0)
+ goto out_irqdomain_remove;

list_add_tail(&port->node, &mxc_gpio_ports);

return 0;

+out_irqdomain_remove:
+ irq_domain_remove(port->domain);
out_irqdesc_free:
irq_free_descs(irq_base, 32);
out_gpiochip_remove:
--
1.8.4.5


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