netdev - Re: [PATCH net 1/1] hv_netvsc: Fix a bug in netvsc_start

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Message-Id: <20150427.225709.1737864122610182544.davem@davemloft.net>
Date:	Mon, 27 Apr 2015 22:57:09 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	kys@...rosoft.com
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org, olaf@...fle.de, apw@...onical.com,
	jasowang@...hat.com
Subject: Re: [PATCH net 1/1] hv_netvsc: Fix a bug in netvsc_start_xmit()

From: "K. Y. Srinivasan" <kys@...rosoft.com>
Date: Mon, 27 Apr 2015 18:14:50 -0700

> Commit commit b08cc79155fc26d0d112b1470d1ece5034651a4b eliminated memory
> allocation in the packet send path. This commit introduced a bug since it
> did not account for the case if the skb was cloned. Fix this bug by
> using the pre-reserved head room only if the skb is not cloned.
> 
> Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>

We have generic infrastructure to do this, please try instead:

	err = skb_cow_head(skb, pkt_sz);

this will take care of everything for you and you can get rid
of all of this dynamic memory allocation etc. in this code
path.
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