Subject: Re: [PATCH net] net/sonic: Use dma_mapping_error()

From: Tom Bogendoerfer <[email-masked]>
Date: Wed, 30 May 2018 11:01:51 +0200

On Wed, May 30, 2018 at 01:03:51PM +1000, Finn Thain wrote:
> With CONFIG_DMA_API_DEBUG=y, calling sonic_open() produces the
> message, "DMA-API: device driver failed to check map error".
> Add the missing dma_mapping_error() call.
> 
> Cc: Thomas Bogendoerfer <[email-masked]>
> Signed-off-by: Finn Thain <[email-masked]>
> ---
>  drivers/net/ethernet/natsemi/sonic.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/natsemi/sonic.c b/drivers/net/ethernet/natsemi/sonic.c
> index 7ed08486ae23..c805dcbebd02 100644
> --- a/drivers/net/ethernet/natsemi/sonic.c
> +++ b/drivers/net/ethernet/natsemi/sonic.c
> @@ -84,7 +84,7 @@ static int sonic_open(struct net_device *dev)
>  	for (i = 0; i < SONIC_NUM_RRS; i++) {
>  		dma_addr_t laddr = dma_map_single(lp->device, skb_put(lp->rx_skb[i], SONIC_RBSIZE),
>  		                                  SONIC_RBSIZE, DMA_FROM_DEVICE);
> -		if (!laddr) {
> +		if (dma_mapping_error(lp->device, laddr)) {
>  			while(i > 0) { /* free any that were mapped successfully */
>  				i--;
>  				dma_unmap_single(lp->device, lp->rx_laddr[i], SONIC_RBSIZE, DMA_FROM_DEVICE);
> -- 
> 2.16.1

looks good

Acked-by: Thomas Bogendoerfer <[email-masked]>

Thomas.

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]