linux-kernel - Re: [PATCH v2] net: ethernet: ti: davinci_cpdma: fix warning "device driver frees DMA memory with different size"

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Date:   Wed, 04 Dec 2019 12:37:18 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     grygorii.strashko@...com
Cc:     netdev@...r.kernel.org, ivan.khoronzhuk@...aro.org, nsekhar@...com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] net: ethernet: ti: davinci_cpdma: fix warning
 "device driver frees DMA memory with different size"

From: Grygorii Strashko <grygorii.strashko@...com>
Date: Wed, 4 Dec 2019 18:50:29 +0200

> @@ -1018,7 +1018,7 @@ static int cpdma_chan_submit_si(struct submit_info *si)
>  	struct cpdma_chan		*chan = si->chan;
>  	struct cpdma_ctlr		*ctlr = chan->ctlr;
>  	int				len = si->len;
> -	int				swlen = len;
> +	int				swlen;
>  	struct cpdma_desc __iomem	*desc;
>  	dma_addr_t			buffer;
>  	u32				mode;
> @@ -1040,6 +1040,7 @@ static int cpdma_chan_submit_si(struct submit_info *si)
>  		chan->stats.runt_transmit_buff++;
>  	}
>  
> +	swlen = len;
>  	mode = CPDMA_DESC_OWNER | CPDMA_DESC_SOP | CPDMA_DESC_EOP;
>  	cpdma_desc_to_port(chan, mode, si->directed);
>  
> -- 
> 2.17.1
> 

Now there is no reason to keep a separate swlen variable.

The integral value is always consumed as the length before the descriptor bits
are added to it.

Therefore you can just use 'len' everywhere in this function now.