ath9k-htc:respect usb buffer cacheline alignment in reg in path

In ath9k-htc register in path, ath9k-htc will pass skb->data into
usb hcd and usb hcd will do dma mapping and unmapping to the buffer
pointed by skb->data, so we should pass a cache-line aligned address.

This patch replace __dev_alloc_skb with alloc_skb to make skb->data
pointed to a cacheline aligned address simply since ath9k-htc does not
skb_push on the skb and pass it to mac80211, also use kfree_skb to free
the skb allocated by alloc_skb(we can use kfree_skb safely in hardirq
context since skb->destructor is NULL always in the path).

Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/net/wireless/ath/ath9k/wmi.c b/drivers/net/wireless/ath/ath9k/wmi.c
index 818dea0164ec..acb66544a2aa 100644
--- a/drivers/net/wireless/ath/ath9k/wmi.c
+++ b/drivers/net/wireless/ath/ath9k/wmi.c
@@ -169,7 +169,7 @@ void ath9k_wmi_tasklet(unsigned long data)
                 break;
         }
 
-        dev_kfree_skb_any(skb);
+        kfree_skb(skb);
 }
 
 static void ath9k_wmi_rsp_callback(struct wmi *wmi, struct sk_buff *skb)
@@ -207,7 +207,7 @@ static void ath9k_wmi_ctrl_rx(void *priv, struct sk_buff *skb,
         ath9k_wmi_rsp_callback(wmi, skb);
 
 free_skb:
-        dev_kfree_skb_any(skb);
+        kfree_skb(skb);
 }
 
 static void ath9k_wmi_ctrl_tx(void *priv, struct sk_buff *skb,