[PATCH AUTOSEL 5.4 02/10] gpio: Fix error message on out-of-range GPIO in lookup table

From: Sasha Levin
Date: Fri Jan 03 2020 - 22:36:28 EST

From: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>

[ Upstream commit d935bd50dd14a7714cbdba9a76435dbb56edb1ae ]

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@xxxxxxxxx>
Link: https://lore.kernel.org/r/20191127095919.4214-1-geert+renesas@xxxxxxxxx
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
drivers/gpio/gpiolib.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 104ed299d5ea..e4afe60f8594 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -4320,8 +4320,9 @@ static struct gpio_desc *gpiod_find(struct device *dev, const char *con_id,

if (chip->ngpio <= p->chip_hwnum) {
- "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);