forked from luck/tmp_suning_uos_patched
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>
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@ -453,9 +453,21 @@ int rt2x00queue_write_tx_frame(struct data_queue *queue, struct sk_buff *skb)
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rt2x00crypto_tx_remove_iv(skb, &txdesc);
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}
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/*
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* When DMA allocation is required we should guarentee to the
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* driver that the DMA is aligned to a 4-byte boundary.
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* Aligning the header to this boundary can be done by calling
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* rt2x00queue_payload_align with the header length of 0.
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* However some drivers require L2 padding to pad the payload
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* rather then the header. This could be a requirement for
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* PCI and USB devices, while header alignment only is valid
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* for PCI devices.
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*/
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if (test_bit(DRIVER_REQUIRE_L2PAD, &queue->rt2x00dev->flags))
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rt2x00queue_payload_align(entry->skb, true,
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txdesc.header_length);
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else if (test_bit(DRIVER_REQUIRE_DMA, &queue->rt2x00dev->flags))
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rt2x00queue_payload_align(entry->skb, false, 0);
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/*
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* It could be possible that the queue was corrupted and this
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