linux-kernel - Re: [PATCH 1/2] fs: configfs: make qw

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Date:   Thu, 25 May 2017 01:33:51 -0700
From:   Stefan Agner <stefan@...er.ch>
To:     balbi@...nel.org
Cc:     Krzysztof Opasiak <k.opasiak@...sung.com>,
        gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] fs: configfs: make qw_sign attribute symmetric

Hi Felipe,

On 2017-04-19 01:53, Krzysztof Opasiak wrote:
> On 04/15/2017 03:35 AM, Stefan Agner wrote:
>> Currently qw_sign requires UTF-8 character to set, but returns UTF-16
>> when read. This isn't obvious when simply using cat since the null
>> characters are not visible, but hexdump unveils the true string:
>>
>>   # echo MSFT100 > os_desc/qw_sign
>>   # hexdump -C os_desc/qw_sign
>>   00000000  4d 00 53 00 46 00 54 00  31 00 30 00 30 00        |M.S.F.T.1.0.0.|
>>
>> Make qw_sign symmetric by returning an UTF-8 string too. Also follow
>> common convention and add a new line at the end.
>>
>> Signed-off-by: Stefan Agner <stefan@...er.ch>
>> ---
>> Resend as discussed here:
>> https://patchwork.kernel.org/patch/9548869/
>>
>> Sorry, a bit later than we discussed... Hope still not too late?
>>
>> --
>> Stefan
>>
>>  drivers/usb/gadget/configfs.c | 8 ++++++--
>>  1 file changed, 6 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/usb/gadget/configfs.c b/drivers/usb/gadget/configfs.c
>> index cbff3b02840d..863ca4ded1be 100644
>> --- a/drivers/usb/gadget/configfs.c
>> +++ b/drivers/usb/gadget/configfs.c
>> @@ -787,9 +787,13 @@ static ssize_t os_desc_b_vendor_code_store(struct config_item *item,
>>  static ssize_t os_desc_qw_sign_show(struct config_item *item, char *page)
>>  {
>>  	struct gadget_info *gi = os_desc_item_to_gadget_info(item);
>> +	int res;
>>
>> -	memcpy(page, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
>> -	return OS_STRING_QW_SIGN_LEN;
>> +	res = utf16s_to_utf8s((wchar_t *) gi->qw_sign, OS_STRING_QW_SIGN_LEN,
>> +			      UTF16_LITTLE_ENDIAN, page, PAGE_SIZE - 1);
>> +	page[res++] = '\n';
>> +
>> +	return res;
>>  }
>>
>>  static ssize_t os_desc_qw_sign_store(struct config_item *item, const char *page,
>>
> 
> Code itself looks good to me and from libusbgx perspective it's also
> fine to add this new line as we can just drop it like we do with other
> newlines in case of gadget/config strings.
> 
> Reviewed-by: Krzysztof Opasiak <k.opasiak@...sung.com>
> 

Any chance we get this in this merge window?

This still applies fine on v4.12-rc2.

--
Stefan