gpio: pca953x: do not ignore i2c errors

commit 540cffbab8b8e6c52a4121666ca18d6e94586ed2 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>

diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
index 7cc7d137133aac218f9a42918999ad69ee776f61..3a3aeef1017f5ec63dbeb1ce2705cdda7a2003b2 100644 (file)
--- a/drivers/gpio/gpio-pca953x.c
+++ b/drivers/gpio/gpio-pca953x.c
@@ -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);
 }