[PATCH] mtd: rawnand: pl353: fix clk reference leak in pl35x_nfc_setup_interface()

[Haotian Zhang]

pl35x_nfc_setup_interface() obtains a reference to the SMC "memclk" with
of_clk_get_by_name() and only uses it to read the clock rate. The
reference is never released: the function has many early return paths
and no clk_put() call anywhere, so the clock reference is leaked.

The hook is invoked repeatedly by the NAND core (nand_reset(),
nand_setup_interface() and the NAND_DATA_IFACE_CHECK_ONLY mode probing
loops), so the reference count keeps growing.

Release the clock reference with clk_put() as soon as its rate has been
read.

Fixes: 08d8c62164a3 ("mtd: rawnand: pl353: Add support for the ARM PL353 SMC NAND controller")
Assisted-by: DeepSeek-V4.1-Flash
Signed-off-by: Haotian Zhang <vulab at iscas.ac.cn>
---
 drivers/mtd/nand/raw/pl35x-nand-controller.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/mtd/nand/raw/pl35x-nand-controller.c b/drivers/mtd/nand/raw/pl35x-nand-controller.c
index bd89aaadd1b2..26b61d856143 100644
--- a/drivers/mtd/nand/raw/pl35x-nand-controller.c
+++ b/drivers/mtd/nand/raw/pl35x-nand-controller.c
@@ -807,6 +807,7 @@ static int pl35x_nfc_setup_interface(struct nand_chip *chip, int cs,
 	 * macro to convert from one to the other.
 	 */
 	period_ns = NSEC_PER_SEC / clk_get_rate(mclk);
+	clk_put(mclk);
 
 	/*
 	 * PL35X SMC needs one extra read cycle in SDR Mode 5. This is not
-- 
2.25.1