| Message ID | 1425318028-26531-6-git-send-email-fw@strlen.de (mailing list archive) |
|---|---|
| State | RFC |
| Headers | show |
On 2015-03-02 18:40, Florian Westphal wrote: > Compile tested only due to lack of hw. > > If we want to shrink skb->cb then we'd have to see about > reducing struct ieee80211_tx_info, which gets embedded inside > skb->cb[]. > > It provides a scratch space to be used by wireless drivers. > ar5523 uses the maximum space available today (40 bytes), but it seems > we don't need this -- data->skb pointer seems to always point back to the > skb whose cb buffer the data structure resides, iow, given a pointer to the > embedded control buffer we can infer the skb address. > > Cc: linux-wireless@vger.kernel.org > Signed-off-by: Florian Westphal <fw@strlen.de> Tested-by: Pontus Fuchs <pontus.fuchs@gmail.com> -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/net/wireless/ath/ar5523/ar5523.c b/drivers/net/wireless/ath/ar5523/ar5523.c index f920506..7410ac0 100644 --- a/drivers/net/wireless/ath/ar5523/ar5523.c +++ b/drivers/net/wireless/ath/ar5523/ar5523.c @@ -779,8 +779,6 @@ static void ar5523_tx(struct ieee80211_hw *hw, ieee80211_stop_queues(hw); } - data->skb = skb; - spin_lock_irqsave(&ar->tx_data_list_lock, flags); list_add_tail(&data->list, &ar->tx_queue_pending); spin_unlock_irqrestore(&ar->tx_data_list_lock, flags); @@ -817,10 +815,12 @@ static void ar5523_tx_work_locked(struct ar5523 *ar) if (!data) break; - skb = data->skb; + txi = container_of((void *)data, struct ieee80211_tx_info, driver_data); txqid = 0; - txi = IEEE80211_SKB_CB(skb); + + skb = container_of((void *) txi, struct sk_buff, cb); paylen = skb->len; + urb = usb_alloc_urb(0, GFP_KERNEL); if (!urb) { ar5523_err(ar, "Failed to allocate TX urb\n"); diff --git a/drivers/net/wireless/ath/ar5523/ar5523.h b/drivers/net/wireless/ath/ar5523/ar5523.h index 00c6fd3..9a322a6 100644 --- a/drivers/net/wireless/ath/ar5523/ar5523.h +++ b/drivers/net/wireless/ath/ar5523/ar5523.h @@ -74,7 +74,6 @@ struct ar5523_tx_cmd { struct ar5523_tx_data { struct list_head list; struct ar5523 *ar; - struct sk_buff *skb; struct urb *urb; };
Compile tested only due to lack of hw. If we want to shrink skb->cb then we'd have to see about reducing struct ieee80211_tx_info, which gets embedded inside skb->cb[]. It provides a scratch space to be used by wireless drivers. ar5523 uses the maximum space available today (40 bytes), but it seems we don't need this -- data->skb pointer seems to always point back to the skb whose cb buffer the data structure resides, iow, given a pointer to the embedded control buffer we can infer the skb address. Cc: linux-wireless@vger.kernel.org Signed-off-by: Florian Westphal <fw@strlen.de> --- drivers/net/wireless/ath/ar5523/ar5523.c | 8 ++++---- drivers/net/wireless/ath/ar5523/ar5523.h | 1 - 2 files changed, 4 insertions(+), 5 deletions(-)