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gpio: pca953x: do not ignore i2c errors

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commit 540cffbab8 upstream.

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.

Cc: stable@vger.kernel.org
Signed-off-by: Andrey Gusakov <andrey.gusakov@cogentembedded.com>
Signed-off-by: Nikita Yushchenko <nikita.yoush@cogentembedded.com>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andrey Gusakov 2021-09-23 20:22:16 +03:00 committed by Greg Kroah-Hartman
parent 516d905503
commit bd4e446a69
1 changed files with 2 additions and 9 deletions
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11
drivers/gpio/gpio-pca953x.c
View file

@ -467,15 +467,8 @@ 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);
}