Patch "leds: ktd2692: avoid harmless maybe-uninitialized warning" has been added to the 4.4-stable tree

Patch "leds: ktd2692: avoid harmless maybe-uninitialized warning" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    leds: ktd2692: avoid harmless maybe-uninitialized warning

to the 4.4-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-ktd2692-avoid-harmless-maybe-uninitialized-warning.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From cbe99c538d1776009e8710755bb6e726f7fffa9b Mon Sep 17 00:00:00 2001
From: Arnd Bergmann <arnd@arndb.de>
Date: Wed, 25 Jan 2017 23:22:36 +0100
Subject: leds: ktd2692: avoid harmless maybe-uninitialized warning

From: Arnd Bergmann <arnd@arndb.de>

commit cbe99c538d1776009e8710755bb6e726f7fffa9b upstream.

gcc gets confused about the control flow in ktd2692_parse_dt(), causing
it to warn about what seems like a potential bug:

drivers/leds/leds-ktd2692.c: In function 'ktd2692_probe':
drivers/leds/leds-ktd2692.c:244:15: error: '*((void *)&led_cfg+8)' may be used uninitialized in this function [-Werror=maybe-uninitialized]
drivers/leds/leds-ktd2692.c:225:7: error: 'led_cfg.flash_max_microamp' may be used uninitialized in this function [-Werror=maybe-uninitialized]
drivers/leds/leds-ktd2692.c:232:3: error: 'led_cfg.movie_max_microamp' may be used uninitialized in this function [-Werror=maybe-uninitialized]

The code is fine, and slightly reworking it in an equivalent way lets
gcc figure that out too, which gets rid of the warning.

Fixes: 77e7915b15bb ("leds: ktd2692: Add missing of_node_put")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/leds/leds-ktd2692.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- a/drivers/leds/leds-ktd2692.c
+++ b/drivers/leds/leds-ktd2692.c
@@ -296,15 +296,15 @@ static int ktd2692_parse_dt(struct ktd26
 		return -ENXIO;
 
 	led->ctrl_gpio = devm_gpiod_get(dev, "ctrl", GPIOD_ASIS);
-	if (IS_ERR(led->ctrl_gpio)) {
-		ret = PTR_ERR(led->ctrl_gpio);
+	ret = PTR_ERR_OR_ZERO(led->ctrl_gpio);
+	if (ret) {
 		dev_err(dev, "cannot get ctrl-gpios %d\n", ret);
 		return ret;
 	}
 
 	led->aux_gpio = devm_gpiod_get(dev, "aux", GPIOD_ASIS);
-	if (IS_ERR(led->aux_gpio)) {
-		ret = PTR_ERR(led->aux_gpio);
+	ret = PTR_ERR_OR_ZERO(led->aux_gpio);
+	if (ret) {
 		dev_err(dev, "cannot get aux-gpios %d\n", ret);
 		return ret;
 	}


Patches currently in stable-queue which might be from arnd@arndb.de are

queue-4.4/arm-8452-3-pj4-make-coprocessor-access-sequences-buildable-in-thumb2-mode.patch
queue-4.4/leds-ktd2692-avoid-harmless-maybe-uninitialized-warning.patch