diff mbox

[1/2] gpio: 74x164: Allocate buffer with gen_74x164_chip

Message ID 1448894126-9309-2-git-send-email-geert+renesas@glider.be
State New
Headers show

Commit Message

Geert Uytterhoeven Nov. 30, 2015, 2:35 p.m. UTC 
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>
---
 drivers/gpio/gpio-74x164.c | 23 +++++++++++------------
 1 file changed, 11 insertions(+), 12 deletions(-)

Comments

Linus Walleij Dec. 10, 2015, 4:14 p.m. UTC | #1 
On Mon, Nov 30, 2015 at 3:35 PM, Geert Uytterhoeven
<geert+renesas@glider.be> wrote:

> 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>

Patch applied.

Yours,
Linus Walleij
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diff mbox

Patch

diff --git a/drivers/gpio/gpio-74x164.c b/drivers/gpio/gpio-74x164.c
index 60172f835d15f139..6664b26523084e12 100644
--- a/drivers/gpio/gpio-74x164.c
+++ b/drivers/gpio/gpio-74x164.c
@@ -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.dev = &spi->dev;