netdev - RE: [PATCH v2 1/2] net: fec: use managed DMA API functions to allocate BD ring

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Date:	Wed, 22 Jul 2015 01:55:13 +0000
From:	Duan Andy <fugang.duan@...escale.com>
To:	Lucas Stach <l.stach@...gutronix.de>,
	"David S. Miller" <davem@...emloft.net>
CC:	Li Frank <Frank.Li@...escale.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"kernel@...gutronix.de" <kernel@...gutronix.de>,
	"patchwork-lst@...gutronix.de" <patchwork-lst@...gutronix.de>
Subject: RE: [PATCH v2 1/2] net: fec: use managed DMA API functions to
 allocate BD ring

From: Lucas Stach <l.stach@...gutronix.de> Sent: Tuesday, July 21, 2015 11:11 PM
> To: David S. Miller
> Cc: Duan Fugang-B38611; Li Frank-B20596; netdev@...r.kernel.org;
> kernel@...gutronix.de; patchwork-lst@...gutronix.de
> Subject: [PATCH v2 1/2] net: fec: use managed DMA API functions to
> allocate BD ring
> 
> So it gets freed when the device is going away.
> This fixes a DMA memory leak on driver probe() fail and driver remove().
> 
> Signed-off-by: Lucas Stach <l.stach@...gutronix.de>
> ---
> v2: Fix indentation of second line to fix alignment with opening bracket.
> ---
>  drivers/net/ethernet/freescale/fec_main.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/freescale/fec_main.c
> b/drivers/net/ethernet/freescale/fec_main.c
> index 349365d85b92..a7f1bdf718f8 100644
> --- a/drivers/net/ethernet/freescale/fec_main.c
> +++ b/drivers/net/ethernet/freescale/fec_main.c
> @@ -3142,8 +3142,8 @@ static int fec_enet_init(struct net_device *ndev)
>  			fep->bufdesc_size;
> 
>  	/* Allocate memory for buffer descriptors. */
> -	cbd_base = dma_alloc_coherent(NULL, bd_size, &bd_dma,
> -				      GFP_KERNEL);
> +	cbd_base = dmam_alloc_coherent(&fep->pdev->dev, bd_size, &bd_dma,
> +				       GFP_KERNEL);
>  	if (!cbd_base) {
>  		return -ENOMEM;
>  	}
> --

Can you also replace the below position with dma_alloc_coherent() ?
                txq->tso_hdrs = dma_alloc_coherent(NULL,
                                        txq->tx_ring_size * TSO_HEADER_SIZE,
                                        &txq->tso_hdrs_dma,
                                        GFP_KERNEL);


Regards,
Andy
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