Re: [PATCH 54/54] staging: wilc1000: wilc_msgqueue.c : remove the goto ERRORHANDER

[Mike Rapoport <mike.rapoport@gmail.com>]

On Tue, Oct 13, 2015 at 08:02:12PM +0900, Tony Cho wrote:
> From: Leo Kim <leo.kim@atmel.com>
> 
> This patch removes goto ERRORHANDER and the result variable in wilc_mq_send.
> Then, the error type is directly returned. If normal operation, freeing memory
> is not needed in this function.
> 
> Signed-off-by: Leo Kim <leo.kim@atmel.com>
> Signed-off-by: Tony Cho <tony.cho@atmel.com>
> ---
>  drivers/staging/wilc1000/wilc_msgqueue.c | 20 +++++---------------
>  1 file changed, 5 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/staging/wilc1000/wilc_msgqueue.c b/drivers/staging/wilc1000/wilc_msgqueue.c
> index b13809a..60539aa 100644
> --- a/drivers/staging/wilc1000/wilc_msgqueue.c
> +++ b/drivers/staging/wilc1000/wilc_msgqueue.c
> @@ -56,20 +56,17 @@ int wilc_mq_destroy(WILC_MsgQueueHandle *pHandle)
>  int wilc_mq_send(WILC_MsgQueueHandle *pHandle,
>  			     const void *pvSendBuffer, u32 u32SendBufferSize)
>  {
> -	int result = 0;
>  	unsigned long flags;
>  	Message *pstrMessage = NULL;
>  
>  	if ((!pHandle) || (u32SendBufferSize == 0) || (!pvSendBuffer)) {
>  		PRINT_ER("pHandle or pvSendBuffer is null\n");
> -		result = -EFAULT;
> -		goto ERRORHANDLER;
> +		return -EFAULT;
>  	}
>  
>  	if (pHandle->bExiting) {
>  		PRINT_ER("pHandle fail\n");
> -		result = -EFAULT;
> -		goto ERRORHANDLER;
> +		return -EFAULT;
>  	}
>  
>  	spin_lock_irqsave(&pHandle->strCriticalSection, flags);
> @@ -83,8 +80,8 @@ int wilc_mq_send(WILC_MsgQueueHandle *pHandle,
>  	pstrMessage->pvBuffer = kmemdup(pvSendBuffer, u32SendBufferSize,
>  					GFP_ATOMIC);
>  	if (!pstrMessage->pvBuffer) {
> -		result = -ENOMEM;
> -		goto ERRORHANDLER;
> +		kfree(pstrMessage);
> +		return -ENOMEM;

It seems that the error path returns from the function while still
holding spinlock and semaphore. It would be better to rework allocation
errors handling so that the locks will be released, rather than just
remove goto...

>  	}
>  
>  	/* add it to the message queue */
> @@ -103,14 +100,7 @@ int wilc_mq_send(WILC_MsgQueueHandle *pHandle,
>  
>  	up(&pHandle->hSem);
>  
> -ERRORHANDLER:
> -	/* error occured, free any allocations */
> -	if (pstrMessage) {
> -		kfree(pstrMessage->pvBuffer);
> -		kfree(pstrMessage);
> -	}
> -
> -	return result;
> +	return 0;
>  }
>  
>  /*!
> -- 
> 1.9.1
> 
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