linux-kernel - [PATCH v2 1/2] reset: Do not register resource data for missing resets

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Message-Id: <20191120145927.8523-2-geert+renesas@glider.be>
Date:   Wed, 20 Nov 2019 15:59:26 +0100
From:   Geert Uytterhoeven <geert+renesas@...der.be>
To:     Philipp Zabel <p.zabel@...gutronix.de>
Cc:     linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH v2 1/2] reset: Do not register resource data for missing resets

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@...der.be>
---
v2:
  - Use IS_ERR_OR_NULL().
---
 drivers/reset/core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/reset/core.c b/drivers/reset/core.c
index c8cc8cacdade0391..7597c70e04d5b42b 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 {
@@ -928,7 +928,7 @@ 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;
 	}
-- 
2.17.1