| From | Greg Kroah-Hartman <> | Subject | [PATCH 3.14 56/98] gpiolib: of: Correct error handling in of_get_named_gpiod_flags | Date | Sun, 25 Jan 2015 10:07:14 -0800 |
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3.14-stable review patch. If anyone has any objections, please let me know.
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From: Hans Holmberg <hans.holmberg@intel.com>
commit 7b8792bbdffdff3abda704f89c6a45ea97afdc62 upstream.
of_get_named_gpiod_flags fails with -EPROBE_DEFER in cases where the gpio chip is available and the GPIO translation fails.
This causes drivers to be re-probed erroneusly, and hides the real problem(i.e. the GPIO number being out of range).
Signed-off-by: Hans Holmberg <hans.holmberg@intel.com> Reviewed-by: Alexandre Courbot <acourbot@nvidia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/gpio/gpiolib-of.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-)
--- a/drivers/gpio/gpiolib-of.c +++ b/drivers/gpio/gpiolib-of.c @@ -44,8 +44,14 @@ static int of_gpiochip_find_and_xlate(st return false; ret = gc->of_xlate(gc, &gg_data->gpiospec, gg_data->flags); - if (ret < 0) - return false; + if (ret < 0) { + /* We've found the gpio chip, but the translation failed. + * Return true to stop looking and return the translation + * error via out_gpio + */ + gg_data->out_gpio = ERR_PTR(ret); + return true; + } gg_data->out_gpio = gpio_to_desc(ret + gc->base); return true;
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