This is a note to let you know that I've just added the patch titled
leds: gpio: Fix uninitialized gpio label for fwnode based probe
to the 5.4-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:
leds-gpio-fix-uninitialized-gpio-label-for-fwnode-based-probe.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 90a8e82d3ca8c1f85ac63f4a94c9b034f05af4ee Mon Sep 17 00:00:00 2001
From: Jacek Anaszewski <jacek.anaszewski@xxxxxxxxx>
Date: Thu, 5 Dec 2019 22:25:01 +0100
Subject: leds: gpio: Fix uninitialized gpio label for fwnode based probe
From: Jacek Anaszewski <jacek.anaszewski@xxxxxxxxx>
commit 90a8e82d3ca8c1f85ac63f4a94c9b034f05af4ee upstream.
When switching to using generic LED name composition mechanism via
devm_led_classdev_register_ext() API the part of code initializing
struct gpio_led's template name property was removed alongside.
It was however overlooked that the property was also passed to
devm_fwnode_get_gpiod_from_child() in place of "label" parameter,
which when set to NULL, results in gpio label being initialized to '?'.
It could be observed in debugfs and failed to properly identify
gpio association with LED consumer.
Fix this shortcoming by updating the GPIO label after the LED is
registered and its final name is known.
Fixes: d7235f5feaa0 ("leds: gpio: Use generic support for composing LED names")
Cc: Russell King <linux@xxxxxxxxxxxxxxx>
Reviewed-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Signed-off-by: Jacek Anaszewski <jacek.anaszewski@xxxxxxxxx>
[fixed comment]
Signed-off-by: Pavel Machek <pavel@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/leds/leds-gpio.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
--- a/drivers/leds/leds-gpio.c
+++ b/drivers/leds/leds-gpio.c
@@ -151,9 +151,14 @@ static struct gpio_leds_priv *gpio_leds_
struct gpio_led led = {};
const char *state = NULL;
+ /*
+ * Acquire gpiod from DT with uninitialized label, which
+ * will be updated after LED class device is registered,
+ * Only then the final LED name is known.
+ */
led.gpiod = devm_fwnode_get_gpiod_from_child(dev, NULL, child,
GPIOD_ASIS,
- led.name);
+ NULL);
if (IS_ERR(led.gpiod)) {
fwnode_handle_put(child);
return ERR_CAST(led.gpiod);
@@ -186,6 +191,9 @@ static struct gpio_leds_priv *gpio_leds_
fwnode_handle_put(child);
return ERR_PTR(ret);
}
+ /* Set gpiod label to match the corresponding LED name. */
+ gpiod_set_consumer_name(led_dat->gpiod,
+ led_dat->cdev.dev->kobj.name);
priv->num_leds++;
}
Patches currently in stable-queue which might be from jacek.anaszewski@xxxxxxxxx are
queue-5.4/leds-gpio-fix-uninitialized-gpio-label-for-fwnode-based-probe.patch
