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authorIwo Mergler <iwo@call-direct.com.au>2008-07-19 16:17:40 +0200
committerJohn W. Linville <linville@tuxdriver.com>2008-07-29 22:55:05 +0200
commitb93ce437eba7e0232683326f30d9d1167a872fad (patch)
tree5f9a501d4407be45e7f3cab6312ae2e3c725278d /drivers/net/wireless/rt2x00/rt73usb.c
parentrt2x00: Large vendor requests for rt73usb firmware upload and beacons (diff)
downloadlinux-b93ce437eba7e0232683326f30d9d1167a872fad.tar.xz
linux-b93ce437eba7e0232683326f30d9d1167a872fad.zip
rt2x00: Fix the beacon length bug
When setting up a beacon template, the length of the beacon is calculated with the assumption that the SKB already contains the Tx descriptor. In the case of beacons it doesn't. This patch undoes the damage by adding the Tx descriptor length to the beacon length. This is safe, because the shortest possible beacon is longer than the Tx header. Signed-off-by: Iwo Mergler <Iwo@call-direct.com.au> Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless/rt2x00/rt73usb.c')
-rw-r--r--drivers/net/wireless/rt2x00/rt73usb.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/net/wireless/rt2x00/rt73usb.c b/drivers/net/wireless/rt2x00/rt73usb.c
index fc320c0409db..866504612e8a 100644
--- a/drivers/net/wireless/rt2x00/rt73usb.c
+++ b/drivers/net/wireless/rt2x00/rt73usb.c
@@ -1330,6 +1330,7 @@ static void rt73usb_write_beacon(struct queue_entry *entry)
struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
unsigned int beacon_base;
u32 reg;
+ u32 word, len;
/*
* Add the descriptor in front of the skb.
@@ -1339,6 +1340,17 @@ static void rt73usb_write_beacon(struct queue_entry *entry)
skbdesc->desc = entry->skb->data;
/*
+ * Adjust the beacon databyte count. The current number is
+ * calculated before this function gets called, but falsely
+ * assumes that the descriptor was already present in the SKB.
+ */
+ rt2x00_desc_read(skbdesc->desc, 0, &word);
+ len = rt2x00_get_field32(word, TXD_W0_DATABYTE_COUNT);
+ len += skbdesc->desc_len;
+ rt2x00_set_field32(&word, TXD_W0_DATABYTE_COUNT, len);
+ rt2x00_desc_write(skbdesc->desc, 0, word);
+
+ /*
* Disable beaconing while we are reloading the beacon data,
* otherwise we might be sending out invalid data.
*/