This is a note to let you know that I've just added the patch titled
net: rfkill: gpio: set GPIO direction
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-rfkill-gpio-set-gpio-direction.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 23484d817082c3005252d8edfc8292c8a1006b5b Mon Sep 17 00:00:00 2001
From: Rouven Czerwinski <r.czerwinski@xxxxxxxxxxxxxx>
Date: Thu, 7 Dec 2023 08:58:36 +0100
Subject: net: rfkill: gpio: set GPIO direction
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
@@ -116,6 +116,14 @@ 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);
Patches currently in stable-queue which might be from r.czerwinski@xxxxxxxxxxxxxx are
queue-5.15/net-rfkill-gpio-set-gpio-direction.patch
