Subject: Re: [PATCH v2 1/2] clk: imx: imx6q: Fix device node reference leak in pll6_bypassed()

From: Peng Fan <[email-masked]>
Date: Mon, 2 Feb 2026 10:04:32 +0800

On Sat, Jan 31, 2026 at 11:16:57AM -0500, Frank Li wrote:
>On Sat, Jan 31, 2026 at 04:11:34PM +0800, Felix Gu wrote:
>> The function pll6_bypassed() calls of_parse_phandle_with_args()
>> but never calls of_node_put() to release the reference, causing
>> a memory leak.
>>
>> Fix this by adding proper cleanup calls on all exit paths.
>>
>> Fixes: 3cc48976e9763 ("clk: imx6q: handle ENET PLL bypass")
>> Signed-off-by: Felix Gu <[email-masked]>
>> ---
>>  drivers/clk/imx/clk-imx6q.c | 6 +++++-
>>  1 file changed, 5 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/clk/imx/clk-imx6q.c b/drivers/clk/imx/clk-imx6q.c
>> index bf4c1d9c9928..1d8e8f0891a3 100644
>> --- a/drivers/clk/imx/clk-imx6q.c
>> +++ b/drivers/clk/imx/clk-imx6q.c
>> @@ -238,8 +238,11 @@ static bool pll6_bypassed(struct device_node *node)
>>  			return false;
>>

One more comment:
Put one line here, "of_node_put", no need duplicate it in below.

>>  		if (clkspec.np == node &&
>> -		    clkspec.args[0] == IMX6QDL_PLL6_BYPASS)
>> +		    clkspec.args[0] == IMX6QDL_PLL6_BYPASS) {
>> +			of_node_put(clkspec.np);

Drop this change

>>  			break;
>> +		}
>> +		of_node_put(clkspec.np);

Ditto.

Regards,
Peng

>>  	}
>>
>>  	/* PLL6 bypass is not part of the assigned clock list */
>> @@ -249,6 +252,7 @@ static bool pll6_bypassed(struct device_node *node)
>>  	ret = of_parse_phandle_with_args(node, "assigned-clock-parents",
>>  					 "#clock-cells", index, &clkspec);
>>
>
>If ret is err, clkspec will not touched. So clkspec.np keep old value,
>of_node_put(clkspec.np) will put twice for previous np.
>
>So need add if (ret) check here. Or use difference variable clkspec with
>init 0.
>
>Frank
>
>> +	of_node_put(clkspec.np);
>>  	if (clkspec.args[0] != IMX6QDL_CLK_PLL6)
>>  		return true;
>>
>>
>> --
>> 2.43.0
>>