linux-kernel - Re: [PATCH] atm: deal with setting entry before mkip was called

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Date:	Mon, 14 Sep 2015 09:50:50 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	davem@...emloft.net, edumazet@...gle.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] atm: deal with setting entry before mkip was called

On Mon, 2015-09-14 at 11:48 -0400, Sasha Levin wrote:

> 
> diff --git a/net/atm/clip.c b/net/atm/clip.c
> index 17e55df..4407b2f 100644
> --- a/net/atm/clip.c
> +++ b/net/atm/clip.c
> @@ -317,6 +317,9 @@ static int clip_constructor(struct neighbour *neigh)
>  
>  static int clip_encap(struct atm_vcc *vcc, int mode)
>  {
> +	if (!CLIP_VCC(vcc))
> +		return -EBADF;
> +
>  	CLIP_VCC(vcc)->encap = mode;
>  	return 0;
>  }


-EBADF has a very precise meaning : /* Bad file number */

In this case, the file number is correct (and maps to a proper file),
but driver state is not allowing for this particular operation.




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