linux-kernel - Re: [PATCH 2/2] serial: 8250_bcm7271: fix leak in `brcmuart

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Message-ID: <a8e21766-266c-c0dc-157c-c6951a5727a7@gmail.com>
Date:   Thu, 27 Apr 2023 16:29:37 -0700
From:   Doug Berger <opendmb@...il.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     Al Cooper <alcooperx@...il.com>,
        XuDong Liu <m202071377@...t.edu.cn>,
        Dongliang Mu <dzm91@...t.edu.cn>,
        Jiri Slaby <jirislaby@...nel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 2/2] serial: 8250_bcm7271: fix leak in `brcmuart_probe`

On 4/27/2023 1:29 PM, Christophe JAILLET wrote:
> Le 27/04/2023 à 20:19, Doug Berger a écrit :
>> Smatch reports:
>> drivers/tty/serial/8250/8250_bcm7271.c:1120 brcmuart_probe() warn:
>> 'baud_mux_clk' from clk_prepare_enable() not released on lines: 1032.
>>
>> The issue is fixed by using a managed clock.
>>
>> Fixes: 41a469482de2 ("serial: 8250: Add new 8250-core based Broadcom 
>> STB driver")
>> Reported-by: XuDong Liu <m202071377@...t.edu.cn>
>> Link: 
>> https://lore.kernel.org/lkml/20230424125100.4783-1-m202071377@hust.edu.cn/
>> Signed-off-by: Doug Berger <opendmb@...il.com>
>> ---
>>   drivers/tty/serial/8250/8250_bcm7271.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/tty/serial/8250/8250_bcm7271.c 
>> b/drivers/tty/serial/8250/8250_bcm7271.c
>> index 90ee7bc12f77..af0e1c070187 100644
>> --- a/drivers/tty/serial/8250/8250_bcm7271.c
>> +++ b/drivers/tty/serial/8250/8250_bcm7271.c
>> @@ -1012,7 +1012,7 @@ static int brcmuart_probe(struct platform_device 
>> *pdev)
>>       of_property_read_u32(np, "clock-frequency", &clk_rate);
>>       /* See if a Baud clock has been specified */
>> -    baud_mux_clk = of_clk_get_by_name(np, "sw_baud");
>> +    baud_mux_clk = devm_clk_get(dev, "sw_baud");
> 
> If switching to devm_clk_get(), maybe devm_clk_get_enabled() could also 
> be an option to fix both issues and avoid adding some LoC.
> 
> The order of operation in the remove function would then be different. I 
> don't know if it can be an issue.
I like the idea, but it doesn't backport to the source of the error.
I'll try to remember to submit something after the merge closes.

> 
> Just my 2c.
> 
> CJ
Thanks!
     Doug