linux-kernel - Re: [PATCH] Staging: rtl8723au: os_intfs: fixed case statement is variable issue

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Date:	Fri, 12 Aug 2016 06:50:03 +0800
From:	sunbing <sunbing@...flag-linux.com>
To:	Jes Sorensen <Jes.Sorensen@...hat.com>
Cc:	Larry.Finger@...inger.net, gregkh@...uxfoundation.org,
	linux-wireless@...r.kernel.org, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org, sunbing.linux@...il.com
Subject: Re: [PATCH] Staging: rtl8723au: os_intfs: fixed case statement is variable issue


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

> Bing Sun <sunbing@...flag-linux.com> writes:
>> Fixed sparse parse error:
>> Expected constant expression in case statement.
>> 
>> Signed-off-by: Bing Sun <sunbing@...flag-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.