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SubjectRe: [PATCH net-next] net: stmmac: Remove unused variable 'ret' at stmmac_rx_buf1_len()
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On 2020/9/11 3:29, Jakub Kicinski wrote:
> On Thu, 10 Sep 2020 10:42:45 +0800 Luo Jiaxing wrote:
>> Fixes the following warning when using W=1 to build kernel:
>>
>> drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:3634:6: warning: variable ‘ret’ set but not used [-Wunused-but-set-variable]
>> int ret, coe = priv->hw->rx_csum;
>>
>> When digging stmmac_get_rx_header_len(), dwmac4_get_rx_header_len() and
>> dwxgmac2_get_rx_header_len() return 0 by default. Therefore, ret do not
>> need to check the error value and can be directly deleted.
>>
>> Signed-off-by: Luo Jiaxing <luojiaxing@huawei.com>
>> ---
>> drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 4 ++--
>> 1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>> index 89b2b34..7e95412 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>> @@ -3631,15 +3631,15 @@ static unsigned int stmmac_rx_buf1_len(struct stmmac_priv *priv,
>> struct dma_desc *p,
>> int status, unsigned int len)
>> {
>> - int ret, coe = priv->hw->rx_csum;
>> unsigned int plen = 0, hlen = 0;
>> + int coe = priv->hw->rx_csum;
>>
>> /* Not first descriptor, buffer is always zero */
>> if (priv->sph && len)
>> return 0;
>>
>> /* First descriptor, get split header length */
>> - ret = stmmac_get_rx_header_len(priv, p, &hlen);
>> + stmmac_get_rx_header_len(priv, p, &hlen);
> This function should return void if there never are any errors to
> report.


Yes, you are right. So, if we need to modify the function type , this
patch need to be drop.

And I will send a new patch later to redefine get_rx_header_len() to
void and delete ret there.


Please check "net: stmmac: set get_rx_header_len() as void for it didn't
have any error code to return" later.


Thanks

Jiaxing


>> if (priv->sph && hlen) {
>> priv->xstats.rx_split_hdr_pkt_n++;
>> return hlen;
>
> .
>

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