rt2x00: Data and desc pointer initialization
rt2500usb and rt73usb data and desc pointer initialization
was incorrect because it was using uninitialized variables
to determine the length.
In addition rt2500usb used skb_pull and removed the ieee80211
from each received frame instead of using skb_trim to remove
the device descriptor from the frame.
Finally this also fixes the descriptor override when 4 byte
aligning occured. We still need a completely valid descriptor
when using the TX/RX dumping capabilities in debugfs.
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/rt2x00/rt2x00usb.c b/drivers/net/wireless/rt2x00/rt2x00usb.c
index d7d3a27..a52939a 100644
--- a/drivers/net/wireless/rt2x00/rt2x00usb.c
+++ b/drivers/net/wireless/rt2x00/rt2x00usb.c
@@ -257,6 +257,13 @@
if (urb->actual_length < entry->ring->desc_size || urb->status)
goto skip_entry;
+ /*
+ * Fill in skb descriptor
+ */
+ skbdesc = get_skb_desc(entry->skb);
+ skbdesc->ring = ring;
+ skbdesc->entry = entry;
+
memset(&desc, 0, sizeof(desc));
rt2x00dev->ops->lib->fill_rxdone(entry, &desc);
@@ -283,9 +290,6 @@
/*
* The data behind the ieee80211 header must be
* aligned on a 4 byte boundary.
- * After that trim the entire buffer down to only
- * contain the valid frame data excluding the device
- * descriptor.
*/
hdr = (struct ieee80211_hdr *)entry->skb->data;
header_size =
@@ -295,16 +299,17 @@
skb_push(entry->skb, 2);
memmove(entry->skb->data, entry->skb->data + 2, skb->len - 2);
}
- skb_trim(entry->skb, desc.size);
/*
- * Fill in skb descriptor
+ * Trim the entire buffer down to only contain the valid frame data
+ * excluding the device descriptor. The position of the descriptor
+ * varies. This means that we should check where the descriptor is
+ * and decide if we need to pull the data pointer to exclude the
+ * device descriptor.
*/
- skbdesc = get_skb_desc(entry->skb);
- skbdesc->desc_len = entry->ring->desc_size;
- skbdesc->data_len = entry->skb->len;
- skbdesc->ring = ring;
- skbdesc->entry = entry;
+ if (skbdesc->data > skbdesc->desc)
+ skb_pull(entry->skb, skbdesc->desc_len);
+ skb_trim(entry->skb, desc.size);
/*
* Send the frame to rt2x00lib for further processing.