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gpio: Fix error message on out-of-range GPIO in lookup table

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commit d935bd50dd14a7714cbdba9a76435dbb56edb1ae upstream.

When a GPIO offset in a lookup table is out-of-range, the printed error
message (1) does not include the actual out-of-range value, and (2)
contains an off-by-one error in the upper bound.

Avoid user confusion by also printing the actual GPIO offset, and
correcting the upper bound of the range.
While at it, use "%u" for unsigned int.

Sample impact:

    -requested GPIO 0 is out of range [0..32] for chip e6052000.gpio
    +requested GPIO 0 (45) is out of range [0..31] for chip e6052000.gpio

Fixes: 2a3cf6a3599e9015 ("gpiolib: return -ENOENT if no GPIO mapping exists")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20191127095919.4214-1-geert+renesas@glider.be
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Geert Uytterhoeven 2019-11-27 10:59:19 +01:00 committed by prashantpaddune
parent d722c3a695
commit f43a132bd1
1 changed files with 3 additions and 2 deletions
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5
drivers/gpio/gpiolib.c
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@ -1949,8 +1949,9 @@ static struct gpio_desc *gpiod_find(struct device *dev, const char *con_id,
if (chip->ngpio <= p->chip_hwnum) {
dev_err(dev,
"requested GPIO %d is out of range [0..%d] for chip %s\n",
idx, chip->ngpio, chip->label);
"requested GPIO %u (%u) is out of range [0..%u] for chip %s\n",
idx, p->chip_hwnum, chip->ngpio - 1,
chip->label);
return ERR_PTR(-EINVAL);
}