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authorJanusz Krzysztofik <jmkrzyszt@gmail.com>2018-07-04 01:18:19 +0300
committerLinus Walleij <linus.walleij@linaro.org>2018-07-09 16:16:48 +0300
commit8853daf3b4acb3bf8c0244a12b4f58ed5123f449 (patch)
tree01b5c24f9337dd6057712b8937388aab2098780b /drivers/gpio/gpiolib.c
parent36b312792b97933dc07abe074f50941199bd357c (diff)
downloadlinux-8853daf3b4acb3bf8c0244a12b4f58ed5123f449.tar.xz
gpiolib: Defer on non-DT find_chip_by_name() failure
Avoid replication of error code conversion in non-DT GPIO consumers' code by returning -EPROBE_DEFER from gpiod_find() in case a chip identified by its label in a registered lookup table is not ready. See https://lkml.org/lkml/2018/5/30/176 for example case. Suggested-by: Boris Brezillon <boris.brezillon@bootlin.com> Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com> Reviewed-by: Boris Brezillon <boris.brezillon@bootlin.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio/gpiolib.c')
-rw-r--r--drivers/gpio/gpiolib.c13
1 files changed, 10 insertions, 3 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 8ec51b7777c6..a9a290999990 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -3656,9 +3656,16 @@ static struct gpio_desc *gpiod_find(struct device *dev, const char *con_id,
chip = find_chip_by_name(p->chip_label);
if (!chip) {
- dev_err(dev, "cannot find GPIO chip %s\n",
- p->chip_label);
- return ERR_PTR(-ENODEV);
+ /*
+ * As the lookup table indicates a chip with
+ * p->chip_label should exist, assume it may
+ * still appear later and let the interested
+ * consumer be probed again or let the Deferred
+ * Probe infrastructure handle the error.
+ */
+ dev_warn(dev, "cannot find GPIO chip %s, deferring\n",
+ p->chip_label);
+ return ERR_PTR(-EPROBE_DEFER);
}
if (chip->ngpio <= p->chip_hwnum) {