[PATCH] gpio: aggregator: simplify aggr_parse() with scoped bitmap

[PATCH] gpio: aggregator: simplify aggr_parse() with scoped bitmap

[Bartosz Golaszewski]

From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

The bitmap allocated in aggr_parse() is always freed before the function
returns so use __free(bitmap) to simplify it and drop the goto label.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
---
 drivers/gpio/gpio-aggregator.c | 16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)

diff --git a/drivers/gpio/gpio-aggregator.c b/drivers/gpio/gpio-aggregator.c
index 38e0fff9afe7..65f41cc3eafc 100644
--- a/drivers/gpio/gpio-aggregator.c
+++ b/drivers/gpio/gpio-aggregator.c
@@ -65,11 +65,11 @@ static int aggr_parse(struct gpio_aggregator *aggr)
 {
 	char *args = skip_spaces(aggr->args);
 	char *name, *offsets, *p;
-	unsigned long *bitmap;
 	unsigned int i, n = 0;
 	int error = 0;
 
-	bitmap = bitmap_alloc(AGGREGATOR_MAX_GPIOS, GFP_KERNEL);
+	unsigned long *bitmap __free(bitmap) =
+			bitmap_alloc(AGGREGATOR_MAX_GPIOS, GFP_KERNEL);
 	if (!bitmap)
 		return -ENOMEM;
 
@@ -82,7 +82,7 @@ static int aggr_parse(struct gpio_aggregator *aggr)
 			/* Named GPIO line */
 			error = aggr_add_gpio(aggr, name, U16_MAX, &n);
 			if (error)
-				goto free_bitmap;
+				return error;
 
 			name = offsets;
 			continue;
@@ -92,13 +92,13 @@ static int aggr_parse(struct gpio_aggregator *aggr)
 		error = bitmap_parselist(offsets, bitmap, AGGREGATOR_MAX_GPIOS);
 		if (error) {
 			pr_err("Cannot parse %s: %d\n", offsets, error);
-			goto free_bitmap;
+			return error;
 		}
 
 		for_each_set_bit(i, bitmap, AGGREGATOR_MAX_GPIOS) {
 			error = aggr_add_gpio(aggr, name, i, &n);
 			if (error)
-				goto free_bitmap;
+				return error;
 		}
 
 		args = next_arg(args, &name, &p);
@@ -106,12 +106,10 @@ static int aggr_parse(struct gpio_aggregator *aggr)
 
 	if (!n) {
 		pr_err("No GPIOs specified\n");
-		error = -EINVAL;
+		return -EINVAL;
 	}
 
-free_bitmap:
-	bitmap_free(bitmap);
-	return error;
+	return 0;
 }
 
 static ssize_t new_device_store(struct device_driver *driver, const char *buf,
-- 
2.43.0

Re: [PATCH] gpio: aggregator: simplify aggr_parse() with scoped bitmap

[Linus Walleij]

On Mon, Sep 30, 2024 at 6:32 PM Bartosz Golaszewski <brgl@bgdev.pl> wrote:

> From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
>
> The bitmap allocated in aggr_parse() is always freed before the function
> returns so use __free(bitmap) to simplify it and drop the goto label.
>
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

Very neat!
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>

Yours,
Linus Walleij

Re: [PATCH] gpio: aggregator: simplify aggr_parse() with scoped bitmap

[Geert Uytterhoeven]

On Mon, Sep 30, 2024 at 6:32 PM Bartosz Golaszewski <brgl@bgdev.pl> wrote:
> From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
>
> The bitmap allocated in aggr_parse() is always freed before the function
> returns so use __free(bitmap) to simplify it and drop the goto label.
>
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Re: [PATCH] gpio: aggregator: simplify aggr_parse() with scoped bitmap

[Bartosz Golaszewski]

From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>


On Mon, 30 Sep 2024 18:32:07 +0200, Bartosz Golaszewski wrote:
> The bitmap allocated in aggr_parse() is always freed before the function
> returns so use __free(bitmap) to simplify it and drop the goto label.
> 
> 

Applied, thanks!

[1/1] gpio: aggregator: simplify aggr_parse() with scoped bitmap
      commit: 22dec5aa596ef805cccbcd3fbe5ebffbcb4fa559

Best regards,
-- 
Bartosz Golaszewski <bartosz.golaszewski@linaro.org>