From: Geert Uytterhoeven <geert+renesas@glider.be>
Date: Wed, 20 Nov 2019 14:59:26 +0000 (+0100)
Subject: reset: Do not register resource data for missing resets
X-Git-Tag: Ubuntu-5.4.0-17.21~2054
X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=3d0336dd16cdb2b30bb18c25b706cbce79fac904;p=mirror_ubuntu-focal-kernel.git

reset: Do not register resource data for missing resets

BugLink: https://bugs.launchpad.net/bugs/1860130

[ Upstream commit db23808615e29d9a04f96806cac56f78b0fee0ef ]

When an optional reset is not present, __devm_reset_control_get() and
devm_reset_control_array_get() still register resource data to release
the non-existing reset on cleanup, which is futile.

Fix this by skipping NULL reset control pointers.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Paolo Pisati <paolo.pisati@canonical.com>
---

diff --git a/drivers/reset/core.c b/drivers/reset/core.c
index 3c9a64c1b7a8..f343bd814d32 100644
--- a/drivers/reset/core.c
+++ b/drivers/reset/core.c
@@ -787,7 +787,7 @@ struct reset_control *__devm_reset_control_get(struct device *dev,
 		return ERR_PTR(-ENOMEM);
 
 	rstc = __reset_control_get(dev, id, index, shared, optional, acquired);
-	if (!IS_ERR(rstc)) {
+	if (!IS_ERR_OR_NULL(rstc)) {
 		*ptr = rstc;
 		devres_add(dev, ptr);
 	} else {
@@ -930,7 +930,7 @@ devm_reset_control_array_get(struct device *dev, bool shared, bool optional)
 		return ERR_PTR(-ENOMEM);
 
 	rstc = of_reset_control_array_get(dev->of_node, shared, optional, true);
-	if (IS_ERR(rstc)) {
+	if (IS_ERR_OR_NULL(rstc)) {
 		devres_free(devres);
 		return rstc;
 	}