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ath9k-htc:respect usb buffer cacheline alignment in ath9k_hif_usb_alloc_rx_urbs

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In ath9k_hif_usb_alloc_rx_urbs, 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 skbs 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>
This commit is contained in:
Ming Lei 2010-04-13 00:28:53 +08:00 committed by John W. Linville
parent 87d77c4ef1
commit f28a7b30cd
1 changed files with 3 additions and 3 deletions
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6
drivers/net/wireless/ath/ath9k/hif_usb.c
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@ -467,7 +467,7 @@ static void ath9k_hif_usb_rx_cb(struct urb *urb)
return; return;
free: free:
dev_kfree_skb_any(skb); kfree_skb(skb);
} }
static void ath9k_hif_usb_reg_in_cb(struct urb *urb) static void ath9k_hif_usb_reg_in_cb(struct urb *urb)
@ -625,7 +625,7 @@ static int ath9k_hif_usb_alloc_rx_urbs(struct hif_device_usb *hif_dev)
} }
/* Allocate buffer */ /* Allocate buffer */
skb = __dev_alloc_skb(MAX_RX_BUF_SIZE, GFP_KERNEL); skb = alloc_skb(MAX_RX_BUF_SIZE, GFP_KERNEL);
if (!skb) { if (!skb) {
ret = -ENOMEM; ret = -ENOMEM;
goto err_skb; goto err_skb;
@ -657,7 +657,7 @@ static int ath9k_hif_usb_alloc_rx_urbs(struct hif_device_usb *hif_dev)
return 0; return 0;
err_submit: err_submit:
dev_kfree_skb_any(skb); kfree_skb(skb);
err_skb: err_skb:
usb_free_urb(urb); usb_free_urb(urb);
err_urb: err_urb: