Linux-GPIO Archive on lore.kernel.org
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From: Geert Uytterhoeven <geert+renesas@glider.be>
To: Linus Walleij <linus.walleij@linaro.org>,
	Bartosz Golaszewski <bgolaszewski@baylibre.com>,
	Alexandre Courbot <acourbot@nvidia.com>
Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org,
	Geert Uytterhoeven <geert+renesas@glider.be>
Subject: [PATCH] gpiolib: Fix error message on out-of-range GPIO in lookup table
Date: Wed, 27 Nov 2019 10:59:19 +0100
Message-ID: <20191127095919.4214-1-geert+renesas@glider.be> (raw)

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>
---
 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 9913886ede904bb0..dce0b31f4125a6b3 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -4472,8 +4472,9 @@ 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);
 		}
 
-- 
2.17.1


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Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-27  9:59 Geert Uytterhoeven [this message]
2019-11-29  8:19 ` Linus Walleij

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