Fix the undefined usage of the GPIO consumer API after retrieving the GPIO description with GPIO_ASIS. The API documentation mentions that GPIO_ASIS won't set a GPIO direction and requires the user to set a direction before using the GPIO.
This can be confirmed on i.MX6 hardware, where rfkill-gpio is no longer able to enabled/disable a device, presumably because the GPIO controller was never configured for the output direction.
Fixes: b2f750c3a80b ("net: rfkill: gpio: prevent value glitch during probe") Cc: stable@vger.kernel.org Signed-off-by: Rouven Czerwinski r.czerwinski@pengutronix.de --- net/rfkill/rfkill-gpio.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/net/rfkill/rfkill-gpio.c b/net/rfkill/rfkill-gpio.c index 5a81505fba9ac..3d9ae696397cf 100644 --- a/net/rfkill/rfkill-gpio.c +++ b/net/rfkill/rfkill-gpio.c @@ -126,6 +126,16 @@ static int rfkill_gpio_probe(struct platform_device *pdev) return -EINVAL; }
+ if (rfkill->reset_gpio) + ret = gpiod_direction_output(rfkill->reset_gpio, true); + if (ret) + return ret; + + if (rfkill->shutdown_gpio) + ret = gpiod_direction_output(rfkill->shutdown_gpio, true); + if (ret) + return ret; + rfkill->rfkill_dev = rfkill_alloc(rfkill->name, &pdev->dev, rfkill->type, &rfkill_gpio_ops, rfkill);
base-commit: 994d5c58e50e91bb02c7be4a91d5186292a895c8