linux-kernel - Re: [PATCH v2] staging: r8188eu: simplify control flow

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Date:   Sun, 3 Apr 2022 22:46:15 -0400
From:   Sevinj Aghayeva <sevinj.aghayeva@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        outreachy@...ts.linux.dev
Cc:     Larry Finger <Larry.Finger@...inger.net>,
        Phillip Potter <phil@...lpotter.co.uk>
Subject: Re: [PATCH v2] staging: r8188eu: simplify control flow

My apologies for forgetting to Cc the maintainers! Added them now.

On Sun, Apr 03, 2022 at 12:42:50PM -0400, Sevinj Aghayeva wrote:
> The function iterates an index from 0 to NUM_PMKID_CACHE and returns
> the first index for which the condition is true. If no such index is
> found, the function returns -1. Current code has a complex control
> flow that obfuscates this simple task. Replace it with a loop.
> 
> Also, given the shortened function body, replace the long variable
> name psecuritypriv with a short variable name p.
> 
> Reported by checkpatch:
> 
> WARNING: else is not generally useful after a break or return
> 
> Signed-off-by: Sevinj Aghayeva <sevinj.aghayeva@...il.com>
> ---
> 
> v1 -> v2: Put the conditional in a single line to avoid checkpatch
> complaint.
> 
>  drivers/staging/r8188eu/core/rtw_mlme.c | 25 ++++++-------------------
>  1 file changed, 6 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/staging/r8188eu/core/rtw_mlme.c b/drivers/staging/r8188eu/core/rtw_mlme.c
> index f94b1536a177..cddd8ab80236 100644
> --- a/drivers/staging/r8188eu/core/rtw_mlme.c
> +++ b/drivers/staging/r8188eu/core/rtw_mlme.c
> @@ -1637,26 +1637,13 @@ int rtw_restruct_wmm_ie(struct adapter *adapter, u8 *in_ie, u8 *out_ie, uint in_
>  
>  static int SecIsInPMKIDList(struct adapter *Adapter, u8 *bssid)
>  {
> -	struct security_priv *psecuritypriv = &Adapter->securitypriv;
> -	int i = 0;
> -
> -	do {
> -		if ((psecuritypriv->PMKIDList[i].bUsed) &&
> -		    (!memcmp(psecuritypriv->PMKIDList[i].Bssid, bssid, ETH_ALEN))) {
> -			break;
> -		} else {
> -			i++;
> -			/* continue; */
> -		}
> -
> -	} while (i < NUM_PMKID_CACHE);
> +	struct security_priv *p = &Adapter->securitypriv;
> +	int i;
>  
> -	if (i == NUM_PMKID_CACHE) {
> -		i = -1;/*  Could not find. */
> -	} else {
> -		/*  There is one Pre-Authentication Key for the specific BSSID. */
> -	}
> -	return i;
> +	for (i = 0; i < NUM_PMKID_CACHE; i++)
> +		if (p->PMKIDList[i].bUsed && !memcmp(p->PMKIDList[i].Bssid, bssid, ETH_ALEN))
> +			return i;
> +	return -1;
>  }
>  
>  /*  */
> -- 
> 2.25.1
>