diff mbox series

gpio: pca953x: do not ignore i2c errors

Message ID 20210923172215.18376-1-nikita.yoush@cogentembedded.com
State New
Headers show
Series gpio: pca953x: do not ignore i2c errors | expand

Commit Message

Nikita Yushchenko Sept. 23, 2021, 5:22 p.m. UTC 
From: Andrey Gusakov <andrey.gusakov@cogentembedded.com>

Per gpio_chip interface, error shall be proparated to the caller.

Attempt to silent diagnostics by returning zero (as written in the
comment) is plain wrong, because the zero return can be interpreted by
the caller as the gpio value.

Signed-off-by: Andrey Gusakov <andrey.gusakov@cogentembedded.com>
Signed-off-by: Nikita Yushchenko <nikita.yoush@cogentembedded.com>
---
 drivers/gpio/gpio-pca953x.c | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

Comments

Bartosz Golaszewski Sept. 29, 2021, 6:41 p.m. UTC | #1 
On Thu, Sep 23, 2021 at 7:22 PM Nikita Yushchenko
<nikita.yoush@cogentembedded.com> wrote:
>
> From: Andrey Gusakov <andrey.gusakov@cogentembedded.com>
>
> Per gpio_chip interface, error shall be proparated to the caller.
>
> Attempt to silent diagnostics by returning zero (as written in the
> comment) is plain wrong, because the zero return can be interpreted by
> the caller as the gpio value.
>
> Signed-off-by: Andrey Gusakov <andrey.gusakov@cogentembedded.com>
> Signed-off-by: Nikita Yushchenko <nikita.yoush@cogentembedded.com>
> ---
>  drivers/gpio/gpio-pca953x.c | 11 ++---------
>  1 file changed, 2 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
> index f5cfc0698799..8ebf369b3ba0 100644
> --- a/drivers/gpio/gpio-pca953x.c
> +++ b/drivers/gpio/gpio-pca953x.c
> @@ -468,15 +468,8 @@ static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
>         mutex_lock(&chip->i2c_lock);
>         ret = regmap_read(chip->regmap, inreg, &reg_val);
>         mutex_unlock(&chip->i2c_lock);
> -       if (ret < 0) {
> -               /*
> -                * NOTE:
> -                * diagnostic already emitted; that's all we should
> -                * do unless gpio_*_value_cansleep() calls become different
> -                * from their nonsleeping siblings (and report faults).
> -                */
> -               return 0;
> -       }
> +       if (ret < 0)
> +               return ret;
>
>         return !!(reg_val & bit);
>  }
> --
> 2.30.2
>

Applied, thanks!

Bart
diff mbox series

Patch

diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
index f5cfc0698799..8ebf369b3ba0 100644
--- a/drivers/gpio/gpio-pca953x.c
+++ b/drivers/gpio/gpio-pca953x.c
@@ -468,15 +468,8 @@  static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
 	mutex_lock(&chip->i2c_lock);
 	ret = regmap_read(chip->regmap, inreg, &reg_val);
 	mutex_unlock(&chip->i2c_lock);
-	if (ret < 0) {
-		/*
-		 * NOTE:
-		 * diagnostic already emitted; that's all we should
-		 * do unless gpio_*_value_cansleep() calls become different
-		 * from their nonsleeping siblings (and report faults).
-		 */
-		return 0;
-	}
+	if (ret < 0)
+		return ret;
 
 	return !!(reg_val & bit);
 }