6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Haotian Zhang vulab@iscas.ac.cn
[ Upstream commit 9b07cdf86a0b90556f5b68a6b20b35833b558df3 ]
The driver calls fwnode_get_named_child_node() which takes a reference on the child node, but never releases it, which causes a reference leak.
Fix by using devm_add_action_or_reset() to automatically release the reference when the device is removed.
Fixes: d5282a539297 ("pinctrl: cs42l43: Add support for the cs42l43") Suggested-by: Charles Keepax ckeepax@opensource.cirrus.com Signed-off-by: Haotian Zhang vulab@iscas.ac.cn Signed-off-by: Linus Walleij linus.walleij@linaro.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/pinctrl/cirrus/pinctrl-cs42l43.c | 23 +++++++++++++++++++---- 1 file changed, 19 insertions(+), 4 deletions(-)
diff --git a/drivers/pinctrl/cirrus/pinctrl-cs42l43.c b/drivers/pinctrl/cirrus/pinctrl-cs42l43.c index c096463184195..e1ac89be7c847 100644 --- a/drivers/pinctrl/cirrus/pinctrl-cs42l43.c +++ b/drivers/pinctrl/cirrus/pinctrl-cs42l43.c @@ -532,6 +532,11 @@ static int cs42l43_gpio_add_pin_ranges(struct gpio_chip *chip) return ret; }
+static void cs42l43_fwnode_put(void *data) +{ + fwnode_handle_put(data); +} + static int cs42l43_pin_probe(struct platform_device *pdev) { struct cs42l43 *cs42l43 = dev_get_drvdata(pdev->dev.parent); @@ -563,10 +568,20 @@ static int cs42l43_pin_probe(struct platform_device *pdev) priv->gpio_chip.ngpio = CS42L43_NUM_GPIOS;
if (is_of_node(fwnode)) { - fwnode = fwnode_get_named_child_node(fwnode, "pinctrl"); - - if (fwnode && !fwnode->dev) - fwnode->dev = priv->dev; + struct fwnode_handle *child; + + child = fwnode_get_named_child_node(fwnode, "pinctrl"); + if (child) { + ret = devm_add_action_or_reset(&pdev->dev, + cs42l43_fwnode_put, child); + if (ret) { + fwnode_handle_put(child); + return ret; + } + if (!child->dev) + child->dev = priv->dev; + fwnode = child; + } }
priv->gpio_chip.fwnode = fwnode;