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gpio: 74x164: Allocate buffer with gen_74x164_chip

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By moving the internal buffer to the end of struct gen_74x164_chip and
converting it from a pointer to a zero-sized array, it can be allocated
together with gen_74x164_chip, reducing the number of managed
allocations.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Geert Uytterhoeven 2015-11-30 15:35:25 +01:00 committed by Linus Walleij
parent 384ca3c6a2
commit 410f4574f4
1 changed files with 11 additions and 12 deletions
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23
drivers/gpio/gpio-74x164.c
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@ -20,10 +20,10 @@
#define GEN_74X164_NUMBER_GPIOS 8
struct gen_74x164_chip {
u8 *buffer;
struct gpio_chip gpio_chip;
struct mutex lock;
u32 registers;
u8 buffer[0];
};
static struct gen_74x164_chip *gpio_to_74x164_chip(struct gpio_chip *gc)
@ -107,6 +107,7 @@ static int gen_74x164_direction_output(struct gpio_chip *gc,
static int gen_74x164_probe(struct spi_device *spi)
{
struct gen_74x164_chip *chip;
u32 nregs;
int ret;
/*
@ -118,7 +119,14 @@ static int gen_74x164_probe(struct spi_device *spi)
if (ret < 0)
return ret;
chip = devm_kzalloc(&spi->dev, sizeof(*chip), GFP_KERNEL);
if (of_property_read_u32(spi->dev.of_node, "registers-number",
&nregs)) {
dev_err(&spi->dev,
"Missing registers-number property in the DT.\n");
return -EINVAL;
}
chip = devm_kzalloc(&spi->dev, sizeof(*chip) + nregs, GFP_KERNEL);
if (!chip)
return -ENOMEM;
@ -130,17 +138,8 @@ static int gen_74x164_probe(struct spi_device *spi)
chip->gpio_chip.set = gen_74x164_set_value;
chip->gpio_chip.base = -1;
if (of_property_read_u32(spi->dev.of_node, "registers-number",
&chip->registers)) {
dev_err(&spi->dev,
"Missing registers-number property in the DT.\n");
return -EINVAL;
}
chip->registers = nregs;
chip->gpio_chip.ngpio = GEN_74X164_NUMBER_GPIOS * chip->registers;
chip->buffer = devm_kzalloc(&spi->dev, chip->registers, GFP_KERNEL);
if (!chip->buffer)
return -ENOMEM;
chip->gpio_chip.can_sleep = true;
chip->gpio_chip.parent = &spi->dev;