linux-kernel - [PATCH V2] pinctrl: falcon: add missing put_device() call in pinctrl_falcon

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Date:   Thu, 19 Nov 2020 09:12:19 +0800
From:   Yu Kuai <yukuai3@...wei.com>
To:     <linus.walleij@...aro.org>, <thomas.langer@...tiq.com>,
        <blogic@...nwrt.org>
CC:     <linux-gpio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <yukuai3@...wei.com>, <yi.zhang@...wei.com>,
        <zhangxiaoxu5@...wei.com>
Subject: [PATCH V2] pinctrl: falcon: add missing put_device() call in pinctrl_falcon_probe()

if of_find_device_by_node() succeed, pinctrl_falcon_probe() doesn't have
a corresponding put_device(). Thus add put_device() to fix the exception
handling for this function implementation.

Fixes: e316cb2b16bb ("OF: pinctrl: MIPS: lantiq: adds support for FALCON SoC")
Signed-off-by: Yu Kuai <yukuai3@...wei.com>
---
 drivers/pinctrl/pinctrl-falcon.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-falcon.c b/drivers/pinctrl/pinctrl-falcon.c
index 62c02b969327..7521a924dffb 100644
--- a/drivers/pinctrl/pinctrl-falcon.c
+++ b/drivers/pinctrl/pinctrl-falcon.c
@@ -431,24 +431,28 @@ static int pinctrl_falcon_probe(struct platform_device *pdev)
 
 	/* load and remap the pad resources of the different banks */
 	for_each_compatible_node(np, NULL, "lantiq,pad-falcon") {
-		struct platform_device *ppdev = of_find_device_by_node(np);
 		const __be32 *bank = of_get_property(np, "lantiq,bank", NULL);
 		struct resource res;
+		struct platform_device *ppdev;
 		u32 avail;
 		int pins;
 
 		if (!of_device_is_available(np))
 			continue;
 
-		if (!ppdev) {
-			dev_err(&pdev->dev, "failed to find pad pdev\n");
-			continue;
-		}
 		if (!bank || *bank >= PORTS)
 			continue;
 		if (of_address_to_resource(np, 0, &res))
 			continue;
+
+		ppdev = of_find_device_by_node(np);
+		if (!ppdev) {
+			dev_err(&pdev->dev, "failed to find pad pdev\n");
+			continue;
+		}
+
 		falcon_info.clk[*bank] = clk_get(&ppdev->dev, NULL);
+		put_device(&ppdev->dev);
 		if (IS_ERR(falcon_info.clk[*bank])) {
 			dev_err(&ppdev->dev, "failed to get clock\n");
 			of_node_put(np);
-- 
2.25.4