Re: [PATCH V4 4/5] net/fec: check id_entry pointer before using it

[Grant Likely <grant.likely-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org>]

On Thu, Mar 10, 2011 at 12:59:44PM +0800, Jason Liu wrote:
> The id_entry will possibly be NULL, So, need check
> id_entry and make sure it not NULL before using it.
> 
> Signed-off-by: Jason Liu <jason.hui-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
> Signed-off-by: Jason Liu <r64343-KZfg59tc24xl57MIdRCFDg@public.gmane.org>

Other than the double s-o-b lines, this patch looks good to me.

Acked-by: Grant Likely <grant.likely-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org>

g.

> ---
>  drivers/net/fec.c |   12 ++++++------
>  1 files changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/net/fec.c b/drivers/net/fec.c
> index 2a71373..02cdd71 100644
> --- a/drivers/net/fec.c
> +++ b/drivers/net/fec.c
> @@ -293,7 +293,7 @@ fec_enet_start_xmit(struct sk_buff *skb, struct net_device *dev)
>  	 * the system that it's running on. As the result, driver has to
>  	 * swap every frame going to and coming from the controller.
>  	 */
> -	if (id_entry->driver_data & FEC_QUIRK_SWAP_FRAME)
> +	if (id_entry && id_entry->driver_data & FEC_QUIRK_SWAP_FRAME)
>  		swap_buffer(bufaddr, skb->len);
>  
>  	/* Save skb pointer */
> @@ -529,7 +529,7 @@ fec_enet_rx(struct net_device *dev)
>  	        dma_unmap_single(NULL, bdp->cbd_bufaddr, bdp->cbd_datlen,
>          			DMA_FROM_DEVICE);
>  
> -		if (id_entry->driver_data & FEC_QUIRK_SWAP_FRAME)
> +		if (id_entry && id_entry->driver_data & FEC_QUIRK_SWAP_FRAME)
>  			swap_buffer(data, pkt_len);
>  
>  		/* This does 16 byte alignment, exactly what we need.
> @@ -808,7 +808,7 @@ static int fec_enet_mii_init(struct platform_device *pdev)
>  	 * mdio interface in board design, and need to be configured by
>  	 * fec0 mii_bus.
>  	 */
> -	if ((id_entry->driver_data & FEC_QUIRK_ENET_MAC) && pdev->id) {
> +	if (id_entry && (id_entry->driver_data & FEC_QUIRK_ENET_MAC) && pdev->id) {
>  		/* fec1 uses fec0 mii_bus */
>  		fep->mii_bus = fec0_mii_bus;
>  		return 0;
> @@ -851,7 +851,7 @@ static int fec_enet_mii_init(struct platform_device *pdev)
>  		goto err_out_free_mdio_irq;
>  
>  	/* save fec0 mii_bus */
> -	if (id_entry->driver_data & FEC_QUIRK_ENET_MAC)
> +	if (id_entry && id_entry->driver_data & FEC_QUIRK_ENET_MAC)
>  		fec0_mii_bus = fep->mii_bus;
>  
>  	return 0;
> @@ -1238,7 +1238,7 @@ fec_restart(struct net_device *dev, int duplex)
>  	 * enet-mac reset will reset mac address registers too,
>  	 * so need to reconfigure it.
>  	 */
> -	if (id_entry->driver_data & FEC_QUIRK_ENET_MAC) {
> +	if (id_entry && id_entry->driver_data & FEC_QUIRK_ENET_MAC) {
>  		memcpy(&temp_mac, dev->dev_addr, ETH_ALEN);
>  		writel(cpu_to_be32(temp_mac[0]), fep->hwp + FEC_ADDR_LOW);
>  		writel(cpu_to_be32(temp_mac[1]), fep->hwp + FEC_ADDR_HIGH);
> @@ -1294,7 +1294,7 @@ fec_restart(struct net_device *dev, int duplex)
>  	 * The phy interface and speed need to get configured
>  	 * differently on enet-mac.
>  	 */
> -	if (id_entry->driver_data & FEC_QUIRK_ENET_MAC) {
> +	if (id_entry && id_entry->driver_data & FEC_QUIRK_ENET_MAC) {
>  		val = readl(fep->hwp + FEC_R_CNTRL);
>  
>  		/* MII or RMII */
> -- 
> 1.7.1
>