netdev - RE: [PATCH] mac80211: Use ERR_CAST inlined function instead of ERR_PTR(PTR

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Date:	Tue, 8 Oct 2013 09:33:52 +0100
From:	"David Laight" <David.Laight@...LAB.COM>
To:	<djduanjiong@...il.com>,
	"Johannes Berg" <johannes@...solutions.net>,
	"John W. Linville" <linville@...driver.com>,
	"David S. Miller" <davem@...emloft.net>
Cc:	<linux-wireless@...r.kernel.org>, <netdev@...r.kernel.org>,
	"Duan Jiong" <duanj.fnst@...fujitsu.com>
Subject: RE: [PATCH] mac80211: Use ERR_CAST inlined function instead of ERR_PTR(PTR_ERR(...))

> Signed-off-by: Duan Jiong <duanj.fnst@...fujitsu.com>
> ---
>  net/mac80211/key.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/net/mac80211/key.c b/net/mac80211/key.c
> index 620677e..3e51dd7 100644
> --- a/net/mac80211/key.c
> +++ b/net/mac80211/key.c
> @@ -879,7 +879,7 @@ ieee80211_gtk_rekey_add(struct ieee80211_vif *vif,
>  				  keyconf->keylen, keyconf->key,
>  				  0, NULL);
>  	if (IS_ERR(key))
> -		return ERR_PTR(PTR_ERR(key));
> +		return ERR_CAST(key);

I suspect the old code is a deliberate attempt to indicate that it
the error value that is being returned rather than the pointer.

Looking higher up that file there seems to be a fubar when setting
up the TKIP key.
It seems to put the same 6 bytes into every TID.
(I'm sure seq_len shouldn't be ignored either.0

	David


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