linux-kernel - Re: [PATCH 2/2] serial: sh-sci: fix missing uart_unregister_driver() in sci_probe

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Date:   Fri, 1 Jul 2022 10:34:49 +0800
From:   Yang Yingliang <yangyingliang@...wei.com>
To:     Greg KH <gregkh@...uxfoundation.org>
CC:     <linux-kernel@...r.kernel.org>, <linux-serial@...r.kernel.org>,
        <geert+renesas@...der.be>, <peter@...leysoftware.com>,
        <sjoerd.simons@...labora.co.uk>
Subject: Re: [PATCH 2/2] serial: sh-sci: fix missing uart_unregister_driver()
 in sci_probe_single()

Hi,

On 2022/6/30 23:13, Greg KH wrote:
> On Thu, Jun 30, 2022 at 10:09:19PM +0800, Yang Yingliang wrote:
>> Add missing uart_unregister_driver() in error case in sci_probe_single().
>>
>> Fixes: 352b92664549 ("serial: sh-sci: Move uart_register_driver call to device probe")
>> Reported-by: Hulk Robot <hulkci@...wei.com>
>> Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
>> ---
>>   drivers/tty/serial/sh-sci.c | 6 +++++-
>>   1 file changed, 5 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
>> index ca5a58f01aff..08a249eaaa8c 100644
>> --- a/drivers/tty/serial/sh-sci.c
>> +++ b/drivers/tty/serial/sh-sci.c
>> @@ -3280,7 +3280,7 @@ static int sci_probe_single(struct platform_device *dev,
>>   
>>   	ret = sci_init_single(dev, sciport, index, p, false);
>>   	if (ret)
>> -		return ret;
>> +		goto err_unregister;
>>   
>>   	sciport->gpios = mctrl_gpio_init(&sciport->port, 0);
>>   	if (IS_ERR(sciport->gpios)) {
>> @@ -3306,6 +3306,10 @@ static int sci_probe_single(struct platform_device *dev,
>>   
>>   err_cleanup_single:
>>   	sci_cleanup_single(sciport);
>> +err_unregister:
>> +	mutex_lock(&sci_uart_registration_lock);
>> +	uart_unregister_driver(&sci_uart_driver);
>> +	mutex_unlock(&sci_uart_registration_lock);
> Did you test this?
>
> I think you just broke all other devices attached to this driver.
>
> Please always test your code before submitting it, especially for stuff
> like this.
I made a mistake here, the register is for the driver not for single 
port, this breaks
other ports, I will be more careful about this case next time.

Thanks,
Yang
>
> thanks,
>
> greg k-h
> .