linux-kernel - Re: [PATCH 1/2] tty: serial: samsung_tty: Fix a memory leak in s3c24xx_serial

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Message-ID: <eb935f16-1f89-0be9-86c9-24e8a88c2d8b@linaro.org>
Date:   Sat, 10 Jun 2023 18:23:58 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Andi Shyti <andi.shyti@...nel.org>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     Alim Akhtar <alim.akhtar@...sung.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Thomas Abraham <thomas.abraham@...aro.org>,
        Kukjin Kim <kgene.kim@...sung.com>,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-serial@...r.kernel.org
Subject: Re: [PATCH 1/2] tty: serial: samsung_tty: Fix a memory leak in
 s3c24xx_serial_getclk() in case of error

On 10/06/2023 16:54, Andi Shyti wrote:
> On Sat, Jun 10, 2023 at 04:07:51PM +0200, Christophe JAILLET wrote:
>> Le 10/06/2023 à 12:26, Andi Shyti a écrit :
>>>> @@ -1459,8 +1459,10 @@ static unsigned int s3c24xx_serial_getclk(struct s3c24xx_uart_port *ourport,
>>>>   			continue;
>>>>   		rate = clk_get_rate(clk);
>>>> -		if (!rate)
>>>> +		if (!rate) {
>>>> +			clk_put(clk);
>>>>   			continue;
>>>
>>> could you also print an error here?
>>>
>>
>> Is:
>> 	dev_err(ourport->port.dev,
>> 		"Failed to get clock rate for %s.\n", clkname);

Why do we need it? Most of other users of clk_get_rate() don't print.
Probably because such condition is highly unlikely if not impossible.
This makes simple function unnecessarily bigger...

Best regards,
Krzysztof