netdev - Re: irq disable in __netdev_alloc

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Message-ID: <1414036086.2094.15.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Wed, 22 Oct 2014 20:48:06 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Alexei Starovoitov <ast@...mgrid.com>
Cc:	Eric Dumazet <edumazet@...gle.com>,
	Network Development <netdev@...r.kernel.org>
Subject: Re: irq disable in __netdev_alloc_frag() ?

On Wed, 2014-10-22 at 19:22 -0700, Alexei Starovoitov wrote:

> yes. I was thinking, since dev is already passed
> into __netdev_alloc_skb(), we can check whether
> dev registered with napi via dev->napi_list and if so,
> tell inner __netdev_alloc_frag() to skip irq disabling...
> 

This does not matter. The problem is not _this_ device, the problem is
that another device might trigger a hard irq, and this hard irq could
mess your data.


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