linux-kernel - Re: [PATCH] tty: serial: ma35d1: Add a NULL check for of

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Date: Thu, 13 Jun 2024 10:54:12 +0800
From: Jacky Huang <ychuang570808@...il.com>
To: Greg KH <gregkh@...uxfoundation.org>
Cc: dan.carpenter@...aro.org, jirislaby@...nel.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 linux-serial@...r.kernel.org, Jacky Huang <ychuang3@...oton.com>
Subject: Re: [PATCH] tty: serial: ma35d1: Add a NULL check for of_node

Dear Greg,


On 2024/6/12 下午 03:23, Greg KH wrote:
> On Wed, Jun 12, 2024 at 08:43:54AM +0800, Jacky Huang wrote:
>> Dear Greg,
>>
>>
>> On 2024/6/11 下午 07:11, Greg KH wrote:
>>> On Tue, Jun 11, 2024 at 09:22:51AM +0000, Jacky Huang wrote:
>>>> From: Jacky Huang <ychuang3@...oton.com>
>>>>
>>>> The pdev->dev.of_node can be NULL if the "serial" node is absent.
>>>> Add a NULL check to return an error in such cases.
>>>>
>>>> Signed-off-by: Jacky Huang <ychuang3@...oton.com>
>>>> ---
>>>>    drivers/tty/serial/ma35d1_serial.c | 13 +++++++------
>>>>    1 file changed, 7 insertions(+), 6 deletions(-)
>>>>
>>>> diff --git a/drivers/tty/serial/ma35d1_serial.c b/drivers/tty/serial/ma35d1_serial.c
>>>> index 19f0a305cc43..3b4206e815fe 100644
>>>> --- a/drivers/tty/serial/ma35d1_serial.c
>>>> +++ b/drivers/tty/serial/ma35d1_serial.c
>>>> @@ -688,12 +688,13 @@ static int ma35d1serial_probe(struct platform_device *pdev)
>>>>    	struct uart_ma35d1_port *up;
>>>>    	int ret = 0;
>>>> -	if (pdev->dev.of_node) {
>>>> -		ret = of_alias_get_id(pdev->dev.of_node, "serial");
>>>> -		if (ret < 0) {
>>>> -			dev_err(&pdev->dev, "failed to get alias/pdev id, errno %d\n", ret);
>>>> -			return ret;
>>>> -		}
>>>> +	if (!pdev->dev.of_node)
>>>> +		return -ENODEV;
>>>> +
>>>> +	ret = of_alias_get_id(pdev->dev.of_node, "serial");
>>>> +	if (ret < 0) {
>>>> +		dev_err(&pdev->dev, "failed to get alias/pdev id, errno %d\n", ret);
>>>> +		return ret;
>>>>    	}
>>>>    	up = &ma35d1serial_ports[ret];
>>>>    	up->port.line = ret;
>>> What commit id does this fix?
>>>
>>> thanks,
>>>
>>> greg k-h
>> This patch fix the in tree ma35d1 serial driver.
>> The last commit for ma35d1_serial.c is
>> '6b64f8e360c00f180cffa1806095cdd2abc55b16'.
> That is obviously not the commit that causes this problem, which is what
> I was looking for here.  Shouldn't you include a "Fixes:" line if this
> is resolving a bug?
>
> thanks,
>
> greg k-h

I got it. The  commit that cause this problem is '930cbf92db01'.
And I will send v2 patch with the "Fixes:" line.
Fixes: 930cbf92db01 ("tty: serial: Add Nuvoton ma35d1 serial driver 
support")


Best Regards,
Jacky Huang