netdev - Re: [net-next 01/13] ixgb: eliminate checkstack warnings

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Message-ID: <1316249007.1610.13.camel@Joe-Laptop>
Date:	Sat, 17 Sep 2011 01:43:26 -0700
From:	Joe Perches <joe@...ches.com>
To:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Cc:	davem@...emloft.net, Jesse Brandeburg <jesse.brandeburg@...el.com>,
	netdev@...r.kernel.org, gospo@...hat.com
Subject: Re: [net-next 01/13] ixgb: eliminate checkstack warnings

On Sat, 2011-09-17 at 01:04 -0700, Jeff Kirsher wrote:
> From: Jesse Brandeburg <jesse.brandeburg@...el.com>
> Really trivial fix, use kzalloc/kree instead of stack space.

Some more trivialities...

> diff --git a/drivers/net/ethernet/intel/ixgb/ixgb_main.c b/drivers/net/ethernet/intel/ixgb/ixgb_main.c\
[]
> @@ -1120,8 +1120,12 @@ ixgb_set_multi(struct net_device *netdev)
>  		rctl |= IXGB_RCTL_MPE;
>  		IXGB_WRITE_REG(hw, RCTL, rctl);
>  	} else {
> -		u8 mta[IXGB_MAX_NUM_MULTICAST_ADDRESSES *
> -			    IXGB_ETH_LENGTH_OF_ADDRESS];
> +		u8 *mta = kzalloc(IXGB_MAX_NUM_MULTICAST_ADDRESSES *
> +			      IXGB_ETH_LENGTH_OF_ADDRESS, GFP_KERNEL);

This doesn't need to be kzalloc as every byte is overwritten.
It should be kmalloc.

Maybe delete the #define IXGB_ETH_LENGTH_OF_ADDRESS and
sed 's/\bIXGB_ETH_LENGTH_OF_ADDRESS\b/ETH_ALEN/g' ?

Perhaps this loop could be clearer without the multiply:

		i = 0;
		netdev_for_each_mc_addr(ha, netdev)
			memcpy(&mta[i++ * IXGB_ETH_LENGTH_OF_ADDRESS],
			       ha->addr, IXGB_ETH_LENGTH_OF_ADDRESS);

Perhaps:

		u8 *addr = mta;
		netdev_for_each_mc_addr(ha, netdev) {
			memcpy(addr, ha->addr, ETH_ALEN);
			addr += ETH_ALEN;
		}


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