On Aug 11, 2016, at 23:25, Jes Sorensen <jes.soren...@redhat.com> wrote:

> Bing Sun <sunb...@redflag-linux.com> writes:
>> Fixed sparse parse error:
>> Expected constant expression in case statement.
>> 
>> Signed-off-by: Bing Sun <sunb...@redflag-linux.com>
>> ---
>> drivers/staging/rtl8723au/os_dep/os_intfs.c | 11 +++++------
>> 1 file changed, 5 insertions(+), 6 deletions(-)
>> 
>> diff --git a/drivers/staging/rtl8723au/os_dep/os_intfs.c 
>> b/drivers/staging/rtl8723au/os_dep/os_intfs.c
>> index b8848c2..f30d5d2 100644
>> --- a/drivers/staging/rtl8723au/os_dep/os_intfs.c
>> +++ b/drivers/staging/rtl8723au/os_dep/os_intfs.c
>> @@ -283,14 +283,13 @@ static u32 rtw_classify8021d(struct sk_buff *skb)
>>       */
>>      if (skb->priority >= 256 && skb->priority <= 263)
>>              return skb->priority - 256;
>> -    switch (skb->protocol) {
>> -    case htons(ETH_P_IP):
>> +
>> +    if (skb->protocol == htons(ETH_P_IP)) {
>>              dscp = ip_hdr(skb)->tos & 0xfc;
>> -            break;
>> -    default:
>> -            return 0;
>> +            return dscp >> 5;
>>      }
>> -    return dscp >> 5;
>> +
>> +    return 0;
>> }
> 
> Pardon me here, but I find it really hard to see how this change is an
> improvement over the old code in any shape or form.
> 
> Jes


There is no functional improvement. 
But before this patch, when we do: make C=1 M=drivers/staging/rtl8723au/
An error output: 
drivers/staging/rtl8723au//os_dep/os_intfs.c:287:14: error: Expected constant 
expression in case statement
To avoid sparse parse error, a case statement converts to an if statement.
So we got this patch.



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