linux-kernel - Re: [PATCH] staging: r8188eu: merge _rtw_enqueue

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Date:   Mon, 13 Feb 2023 20:23:13 +0100
From:   Philipp Hortmann <philipp.g.hortmann@...il.com>
To:     Martin Kaiser <martin@...ser.cx>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Larry Finger <Larry.Finger@...inger.net>,
        Phillip Potter <phil@...lpotter.co.uk>,
        Michael Straube <straube.linux@...il.com>,
        Pavel Skripkin <paskripkin@...il.com>,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: r8188eu: merge _rtw_enqueue_cmd into its caller

On 2/11/23 17:50, Martin Kaiser wrote:
> The _rtw_enqueue_cmd function is called only by rtw_enqueue_cmd.
> 
> When _rtw_enqueue_cmd is called, the caller has already checked that the
> obj parameter is not NULL. _rtw_enqueue_cmd returns _SUCCESS in any case.
> 
> We can merge the two functions and simplify the error handling.
> 
> Signed-off-by: Martin Kaiser <martin@...ser.cx>
> ---
>   drivers/staging/r8188eu/core/rtw_cmd.c | 47 +++++---------------------
>   1 file changed, 9 insertions(+), 38 deletions(-)
> 
> diff --git a/drivers/staging/r8188eu/core/rtw_cmd.c b/drivers/staging/r8188eu/core/rtw_cmd.c
> index d57360a68fb3..ca9e3d4ee7f4 100644
> --- a/drivers/staging/r8188eu/core/rtw_cmd.c
> +++ b/drivers/staging/r8188eu/core/rtw_cmd.c
> @@ -28,32 +28,6 @@ void rtw_free_evt_priv(struct	evt_priv *pevtpriv)
>   	}
>   }
>   
> -/* Calling Context:
> - *
> - * rtw_enqueue_cmd can only be called between kernel thread,
> - * since only spin_lock is used.
> - *
> - * ISR/Call-Back functions can't call this sub-function.
> - */
> -
> -static int _rtw_enqueue_cmd(struct __queue *queue, struct cmd_obj *obj)
> -{
> -	unsigned long flags;
> -
> -	if (!obj)
> -		goto exit;
> -
> -	spin_lock_irqsave(&queue->lock, flags);
> -
> -	list_add_tail(&obj->list, &queue->queue);
> -
> -	spin_unlock_irqrestore(&queue->lock, flags);
> -
> -exit:
> -
> -	return _SUCCESS;
> -}
> -
>   int rtw_init_cmd_priv(struct cmd_priv *pcmdpriv)
>   {
>   	init_completion(&pcmdpriv->enqueue_cmd);
> @@ -125,28 +99,25 @@ static int rtw_cmd_filter(struct cmd_priv *pcmdpriv, struct cmd_obj *cmd_obj)
>   
>   u32 rtw_enqueue_cmd(struct cmd_priv *pcmdpriv, struct cmd_obj *cmd_obj)
>   {
> -	int res = _FAIL;
> +	unsigned long flags;
>   	struct adapter *padapter = pcmdpriv->padapter;
>   
>   	if (!cmd_obj)
> -		goto exit;
> +		return _FAIL;
>   
>   	cmd_obj->padapter = padapter;
>   
> -	res = rtw_cmd_filter(pcmdpriv, cmd_obj);
> -	if (res == _FAIL) {
> +	if (rtw_cmd_filter(pcmdpriv, cmd_obj) == _FAIL) {
>   		rtw_free_cmd_obj(cmd_obj);
> -		goto exit;
> +		return _FAIL;
>   	}
>   
> -	res = _rtw_enqueue_cmd(&pcmdpriv->cmd_queue, cmd_obj);
> -
> -	if (res == _SUCCESS)
> -		complete(&pcmdpriv->enqueue_cmd);
> +	spin_lock_irqsave(&pcmdpriv->cmd_queue.lock, flags);
> +	list_add_tail(&cmd_obj->list, &pcmdpriv->cmd_queue.queue);
> +	spin_unlock_irqrestore(&pcmdpriv->cmd_queue.lock, flags);
>   
> -exit:
> -
> -	return res;
> +	complete(&pcmdpriv->enqueue_cmd);
> +	return _SUCCESS;
>   }
>   
>   struct	cmd_obj	*rtw_dequeue_cmd(struct cmd_priv *pcmdpriv)

Tested-by: Philipp Hortmann <philipp.g.hortmann@...il.com> # Edimax N150