From a061a93b6eb8db8227b251666436da1e344771a0 Mon Sep 17 00:00:00 2001 From: Gertjan van Wingerde Date: Mon, 13 Dec 2010 12:33:12 +0100 Subject: [PATCH] rt2x00: Ensure TX-ed frames are returned in the original state. Recent changes to the TX-done code of rt2x00 resulted in TX-ed frames not being returned to mac80211 in the original state, and therefore with insufficient headroom for re-transmissions. Fix this by reverting the changes done and by ensuring we remove the inserted L2pad by moving the header backwards instead of the data forwards. At the same time also make sure that the rt2x00queue_remove_l2pad will not move any memory when a frame has no data at all. Signed-off-by: Gertjan van Wingerde Acked-by: Helmut Schaa Cc: Jay Hung Signed-off-by: Ivo van Doorn Signed-off-by: John W. Linville --- drivers/net/wireless/rt2x00/rt2x00queue.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) diff --git a/drivers/net/wireless/rt2x00/rt2x00queue.c b/drivers/net/wireless/rt2x00/rt2x00queue.c index a3d79c7a21c6..35133d8558b5 100644 --- a/drivers/net/wireless/rt2x00/rt2x00queue.c +++ b/drivers/net/wireless/rt2x00/rt2x00queue.c @@ -199,15 +199,18 @@ void rt2x00queue_insert_l2pad(struct sk_buff *skb, unsigned int header_length) void rt2x00queue_remove_l2pad(struct sk_buff *skb, unsigned int header_length) { - unsigned int l2pad = L2PAD_SIZE(header_length); + /* + * L2 padding is only present if the skb contains more than just the + * IEEE 802.11 header. + */ + unsigned int l2pad = (skb->len > header_length) ? + L2PAD_SIZE(header_length) : 0; if (!l2pad) return; - memmove(skb->data + header_length, skb->data + header_length + l2pad, - skb->len - header_length - l2pad); - - skb_trim(skb, skb->len - l2pad); + memmove(skb->data + l2pad, skb->data, header_length); + skb_pull(skb, l2pad); } static void rt2x00queue_create_tx_descriptor_seq(struct queue_entry *entry, -- 2.20.1