Re: [PATCH] ath9k : stability issue in a noisy environment

Re: [PATCH] ath9k : stability issue in a noisy environment

[Luis R. Rodriguez]

On Wed, May 09, 2012 at 08:12:38PM +0800, Hewitt Lee wrote:
>    Hi All,
>    This patch unlink a skb comes from ath_tx_form_aggr() which is freed at
>    ath_tx_get_buffer() when tx buffers are full.
>    Please kindly review it.

Please see:

http://wireless.kernel.org/en/developers/Documentation/SubmittingPatches

Also please provide a clear description of what you are trying to fix,
what happens without the patch, what happens with the patch. My review
below.

>    Thanks.
>    diff --git a/v3.3.x/drivers/net/wireless/ath/ath9k/xmit.c
>    b/v3.3.x/drivers/net/wireless/ath/ath9k/xmit.c
>    old mode 100644
>    new mode 100755
>    index 3182408..f4e1e62
>    --- a/v3.3.x/drivers/net/wireless/ath/ath9k/xmit.c
>    +++ b/v3.3.x/drivers/net/wireless/ath/ath9k/xmit.c
>    @@ -1858,6 +1858,12 @@ static struct ath_buf *ath_tx_setup_buffer(struct
>    ath_softc *sc,
>       return bf;
>     
>     error:
>    +  if (tid) {
>    +  if (skb == skb_peek(&tid->buf_q)) {
>    +  __skb_unlink(skb, &tid->buf_q);
>    +  }
>    +  }
>    +
>       dev_kfree_skb_any(skb);
>       return NULL;
>     }

Yeah I have no idea why you are doing this here, based on your description
the skb will be free'd at ath_tx_get_buffer() but ath_tx_get_buffer()
does not free anything. Can you please be sure to check first against
the latest development tree for 802.11 first?

  Luis