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gpiolib: normalize the return value of gc->get() on behalf of buggy drivers

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Commit 86ef402d80 ("gpiolib: sanitize the return value of
gpio_chip::get()") started checking the return value of the .get()
callback in struct gpio_chip. Now - almost a year later - it turns out
that there are quite a few drivers in tree that can break with this
change. Partially revert it: normalize the return value in GPIO core but
also emit a warning.

Cc: stable@vger.kernel.org
Fixes: 86ef402d80 ("gpiolib: sanitize the return value of gpio_chip::get()")
Reported-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Closes: https://lore.kernel.org/all/aZSkqGTqMp_57qC7@google.com/
Reviewed-by: Linus Walleij <linusw@kernel.org>
Reviewed-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Link: https://patch.msgid.link/20260219-gpiolib-set-normalize-v2-1-f84630e45796@oss.qualcomm.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
This commit is contained in:
Bartosz Golaszewski
2026-02-19 10:51:33 +01:00
parent 32e0a7ad9c
commit ec2cceadfa
1 changed files with 6 additions and 2 deletions
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8
drivers/gpio/gpiolib.c
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@@ -3267,8 +3267,12 @@ static int gpiochip_get(struct gpio_chip *gc, unsigned int offset)
/* Make sure this is called after checking for gc->get(). */
ret = gc->get(gc, offset);
if (ret > 1)
ret = -EBADE;
if (ret > 1) {
gpiochip_warn(gc,
"invalid return value from gc->get(): %d, consider fixing the driver\n",
ret);
ret = !!ret;
}
return ret;
}