4.19-stable review patch. If anyone has any objections, please let me know.
------------------
From: Rouven Czerwinski <r.czerwinski@xxxxxxxxxxxxxx>
commit 23484d817082c3005252d8edfc8292c8a1006b5b upstream.
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@xxxxxxxxxxxxxxx
Signed-off-by: Rouven Czerwinski <r.czerwinski@xxxxxxxxxxxxxx>
Link: https://msgid.link/20231207075835.3091694-1-r.czerwinski@xxxxxxxxxxxxxx
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/rfkill/rfkill-gpio.c | 8 ++++++++
1 file changed, 8 insertions(+)
--- a/net/rfkill/rfkill-gpio.c
+++ b/net/rfkill/rfkill-gpio.c
@@ -130,6 +130,14 @@ static int rfkill_gpio_probe(struct plat
return -EINVAL;
}
+ ret = gpiod_direction_output(rfkill->reset_gpio, true);
+ if (ret)
+ return ret;
+
+ 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);
