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authorIvo van Doorn <ivdoorn@gmail.com>2009-08-08 23:53:47 +0200
committerJohn W. Linville <linville@tuxdriver.com>2009-08-14 09:13:52 -0400
commit93354cbbcbfca920495377158c0f61c36be79e13 (patch)
tree01a5a58b7bb9a907d69201743146726dacb92331 /drivers
parent267e898755d7fc6249e26208e7ce97f415fd8c31 (diff)
rt2x00: Align ieee80211 header to 4-byte boundary for PCI devices
Some hardware require the ieee80211 header to be aligned to a 4-byte boundary before mapping it to the DMA. Otherwise some frames (like beacons) will not be send out correctly by the device. Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/wireless/rt2x00/rt2x00queue.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/net/wireless/rt2x00/rt2x00queue.c b/drivers/net/wireless/rt2x00/rt2x00queue.c
index 65435c9fe4b..e67e339d9df 100644
--- a/drivers/net/wireless/rt2x00/rt2x00queue.c
+++ b/drivers/net/wireless/rt2x00/rt2x00queue.c
@@ -453,9 +453,21 @@ int rt2x00queue_write_tx_frame(struct data_queue *queue, struct sk_buff *skb)
rt2x00crypto_tx_remove_iv(skb, &txdesc);
}
+ /*
+ * When DMA allocation is required we should guarentee to the
+ * driver that the DMA is aligned to a 4-byte boundary.
+ * Aligning the header to this boundary can be done by calling
+ * rt2x00queue_payload_align with the header length of 0.
+ * However some drivers require L2 padding to pad the payload
+ * rather then the header. This could be a requirement for
+ * PCI and USB devices, while header alignment only is valid
+ * for PCI devices.
+ */
if (test_bit(DRIVER_REQUIRE_L2PAD, &queue->rt2x00dev->flags))
rt2x00queue_payload_align(entry->skb, true,
txdesc.header_length);
+ else if (test_bit(DRIVER_REQUIRE_DMA, &queue->rt2x00dev->flags))
+ rt2x00queue_payload_align(entry->skb, false, 0);
/*
* It could be possible that the queue was corrupted and this