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gpio: altera: use container_of() to get state container

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The state container of the Altera GPIO driver is extracted from
the gpio_chip exploiting the fact that offsetof() the
struct gpio_chip inside the struct of_mm_gpio_chip are both 0, so
the container_of() is in practice a noop. However if a member
is added to struct altera_gpio_chip in front of
struct of_mm_gpio_chip, things will break. Using proper
container_of() avoids this problem.

Semantically this is a noop, the compiler will optimize it away,
but syntactically it makes me happier.

Cc: Tien Hock Loh <thloh@altera.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Linus Walleij 2015-08-25 10:54:12 +02:00
parent 4843289e60
commit 231d51b8a4
1 changed files with 10 additions and 5 deletions
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15
drivers/gpio/gpio-altera.c
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@ -42,6 +42,11 @@ struct altera_gpio_chip {
int mapped_irq;
};
static struct altera_gpio_chip *to_altera(struct gpio_chip *gc)
{
return container_of(gc, struct altera_gpio_chip, mmchip.gc);
}
static void altera_gpio_irq_unmask(struct irq_data *d)
{
struct altera_gpio_chip *altera_gc;
@ -49,7 +54,7 @@ static void altera_gpio_irq_unmask(struct irq_data *d)
unsigned long flags;
u32 intmask;
altera_gc = irq_data_get_irq_chip_data(d);
altera_gc = to_altera(irq_data_get_irq_chip_data(d));
mm_gc = &altera_gc->mmchip;
spin_lock_irqsave(&altera_gc->gpio_lock, flags);
@ -67,7 +72,7 @@ static void altera_gpio_irq_mask(struct irq_data *d)
unsigned long flags;
u32 intmask;
altera_gc = irq_data_get_irq_chip_data(d);
altera_gc = to_altera(irq_data_get_irq_chip_data(d));
mm_gc = &altera_gc->mmchip;
spin_lock_irqsave(&altera_gc->gpio_lock, flags);
@ -87,7 +92,7 @@ static int altera_gpio_irq_set_type(struct irq_data *d,
{
struct altera_gpio_chip *altera_gc;
altera_gc = irq_data_get_irq_chip_data(d);
altera_gc = to_altera(irq_data_get_irq_chip_data(d));
if (type == IRQ_TYPE_NONE)
return 0;
@ -210,7 +215,7 @@ static void altera_gpio_irq_edge_handler(struct irq_desc *desc)
unsigned long status;
int i;
altera_gc = irq_desc_get_handler_data(desc);
altera_gc = to_altera(irq_desc_get_handler_data(desc));
chip = irq_desc_get_chip(desc);
mm_gc = &altera_gc->mmchip;
irqdomain = altera_gc->mmchip.gc.irqdomain;
@ -239,7 +244,7 @@ static void altera_gpio_irq_leveL_high_handler(struct irq_desc *desc)
unsigned long status;
int i;
altera_gc = irq_desc_get_handler_data(desc);
altera_gc = to_altera(irq_desc_get_handler_data(desc));
chip = irq_desc_get_chip(desc);
mm_gc = &altera_gc->mmchip;
irqdomain = altera_gc->mmchip.gc.irqdomain;