linux-kernel - [PATCH] mtd: rawnand: lpc32xx_slc: fix GPIO descriptor leak on probe error and remove

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Message-ID: <20251028094747.1089-1-vulab@iscas.ac.cn>
Date: Tue, 28 Oct 2025 17:47:47 +0800
From: Haotian Zhang <vulab@...as.ac.cn>
To: miquel.raynal@...tlin.com,
	richard@....at,
	vigneshr@...com,
	vz@...ia.com,
	piotr.wojtaszczyk@...esys.com
Cc: dmitry.torokhov@...il.com,
	linux-mtd@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Haotian Zhang <vulab@...as.ac.cn>
Subject: [PATCH] mtd: rawnand: lpc32xx_slc: fix GPIO descriptor leak on probe error and remove

The driver calls gpiod_get_optional() in the probe function but
never calls gpiod_put() in the remove function or in the probe
error path. This leads to a GPIO descriptor resource leak.
The lpc32xx_mlc.c driver in the same directory handles this
correctly by calling gpiod_put() on both paths.

Add gpiod_put() in the remove function and in the probe error path
to fix the resource leak.

Fixes: 6b923db2867c ("mtd: rawnand: lpc32xx_slc: switch to using gpiod API")
Signed-off-by: Haotian Zhang <vulab@...as.ac.cn>
---
 drivers/mtd/nand/raw/lpc32xx_slc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/mtd/nand/raw/lpc32xx_slc.c b/drivers/mtd/nand/raw/lpc32xx_slc.c
index b54d76547ffb..fea3705a2138 100644
--- a/drivers/mtd/nand/raw/lpc32xx_slc.c
+++ b/drivers/mtd/nand/raw/lpc32xx_slc.c
@@ -937,6 +937,7 @@ static int lpc32xx_nand_probe(struct platform_device *pdev)
 	dma_release_channel(host->dma_chan);
 enable_wp:
 	lpc32xx_wp_enable(host);
+	gpiod_put(host->wp_gpio);
 
 	return res;
 }
@@ -962,6 +963,7 @@ static void lpc32xx_nand_remove(struct platform_device *pdev)
 	writel(tmp, SLC_CTRL(host->io_base));
 
 	lpc32xx_wp_enable(host);
+	gpiod_put(host->wp_gpio);
 }
 
 static int lpc32xx_nand_resume(struct platform_device *pdev)
-- 
2.50.1.windows.1