• Ming Lei's avatar
    ath9k-htc:respect usb buffer cacheline alignment in ath9k_hif_usb_alloc_rx_urbs · f28a7b30
    Ming Lei authored
    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: default avatarMing Lei <tom.leiming@gmail.com>
    Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
    f28a7b30
hif_usb.c 21.5 KB