diff options
| author | Janusz Krzysztofik <jmkrzyszt@gmail.com> | 2018-07-04 00:18:19 +0200 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2018-07-09 15:16:48 +0200 |
| commit | 8853daf3b4acb3bf8c0244a12b4f58ed5123f449 (patch) | |
| tree | 01b5c24f9337dd6057712b8937388aab2098780b /drivers/gpio/gpiolib.c | |
| parent | 36b312792b97933dc07abe074f50941199bd357c (diff) | |
| download | linux-8853daf3b4acb3bf8c0244a12b4f58ed5123f449.tar.bz2 | |
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.c | 13 |
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) { |