netdev - Re: [PATCH 3/4] cxgb4: remove redundant NULL check

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Date:   Wed, 27 Jan 2021 09:35:47 +0530
From:   Raju Rangoju <rajur@...lsio.com>
To:     Yang Li <abaci-bugfix@...ux.alibaba.com>
Cc:     davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] cxgb4: remove redundant NULL check

On Monday, January 01/25/21, 2021 at 17:47:24 +0800, Yang Li wrote:
> Fix below warnings reported by coccicheck:
> ./drivers/net/ethernet/chelsio/cxgb4/cxgb4_cudbg.c:161:2-7: WARNING:
> NULL check before some freeing functions is not needed.
> 
> Reported-by: Abaci Robot <abaci@...ux.alibaba.com>
> Signed-off-by: Yang Li <abaci-bugfix@...ux.alibaba.com>
> ---
>  drivers/net/ethernet/chelsio/cxgb4/cxgb4_cudbg.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_cudbg.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_cudbg.c
> index 77648e4..dd66b24 100644
> --- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_cudbg.c
> +++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_cudbg.c
> @@ -157,8 +157,7 @@ static int cudbg_alloc_compress_buff(struct cudbg_init *pdbg_init)
>  
>  static void cudbg_free_compress_buff(struct cudbg_init *pdbg_init)
>  {
> -	if (pdbg_init->compress_buff)

NAK. The above check is necessary.

pdbg_init->compress_buff may be NULL when Zlib is unavailable or when
pdbg_init->compress_buff allocation fails, in which case we ignore error
and continue without compression.

> -		vfree(pdbg_init->compress_buff);
> +	vfree(pdbg_init->compress_buff);
>  }
>  
>  int cxgb4_cudbg_collect(struct adapter *adap, void *buf, u32 *buf_size,
> -- 
> 1.8.3.1
>