linux-kernel - Re: Re: [PATCH v3] USB: serial: ftdi_sio: Convert to use dev

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Message-Id: <20220905100101.343861-1-jiasheng@iscas.ac.cn>
Date:   Mon,  5 Sep 2022 18:01:01 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     gregkh@...uxfoundation.org
Cc:     johan@...nel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: Re: Re: [PATCH v3] USB: serial: ftdi_sio: Convert to use dev_groups

On Fri, Sep 02, 2022 at 10:52:52PM +0800, Greg KH wrote:
>>>>  drivers/usb/serial/ftdi_sio.c | 101 +++++++++++++++++-----------------
>>>>  1 file changed, 51 insertions(+), 50 deletions(-)
>>>> 
>>>> diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
>>>> index d5a3986dfee7..479c3a5caaf8 100644
>>>> --- a/drivers/usb/serial/ftdi_sio.c
>>>> +++ b/drivers/usb/serial/ftdi_sio.c
>>>> @@ -1107,11 +1107,40 @@ static u32 ftdi_232bm_baud_base_to_divisor(int baud, int base);
>>>>  static u32 ftdi_232bm_baud_to_divisor(int baud);
>>>>  static u32 ftdi_2232h_baud_base_to_divisor(int baud, int base);
>>>>  static u32 ftdi_2232h_baud_to_divisor(int baud);
>>>> +static umode_t ftdi_sio_attr_is_visible(struct kobject *kobj,
>>>> +					 struct attribute *attr, int idx);
>>>> +static ssize_t latency_timer_store(struct device *dev,
>>>> +				   struct device_attribute *attr,
>>>> +				   const char *valbuf, size_t count);
>>>> +static ssize_t event_char_store(struct device *dev,
>>>> +	struct device_attribute *attr, const char *valbuf, size_t count);
>>>> +static ssize_t latency_timer_show(struct device *dev,
>>>> +				  struct device_attribute *attr, char *buf);
>>>> +
>>> 
>>> Please work with the code so that you do not have to pre-define these
>>> functions.  It should be possible.  Worst case, you pre-define the
>>> structure for the driver, that should be it.
>> 
>> Without pre-definition of the functions, compilation errors will occur,
>> such as 'ftdi_sio_attr_is_visible' undeclared here.
>> I have no idea why they are not necessary.
> 
> If you move the code around that asks for those functions, you will not
> need to define them.
> 

Fine, I have already revised the patch and submitted a v4.

>>> And again, have you tested this change?
>> 
>> Every time I change the code, I recomplie it and check whether there are
>> errors.
>> Are there any other tests I need to do?
> 
> Yes, boot with the device and make sure that the sysfs files are still
> there.  You do have access to one of these devices, right?  They are
> very very common.

Sorry, I still have no idea how to boot with the device.
But if there is any wrong with the patch, you can tell me and I will continue
to revise it.

Thanks,
Jiang