From: RA-Jay Hung <Jay_Hung@ralinktech.com>
Date: Sat, 13 Nov 2010 18:11:46 +0000 (+0100)
Subject: rt2x00: Fix rt2800 USB TX Path DMA issue
X-Git-Tag: v2.6.38-rc1~476^2~405^2^2~91
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b43d63bd69ae5464a52bf1796e84097607917b2f;p=pandora-kernel.git

rt2x00: Fix rt2800 USB TX Path DMA issue

rt2800usb chips need to add 1~3 bytes zero padding after each 802.11 header & payload,
and at the end need to add 4 bytes zero padding whether doing TX bulk aggregation or not,

TXINFO_W0_USB_DMA_TX_PKT_LEN in TXINFO must include 1-3 bytes padding after 802.11 header & payload
but do not include 4 bytes end zero padding.

In rt2800usb_get_tx_data_len do not consider multiple of the USB packet size case, sometimes this will
cause USB DMA problem.

Signed-off-by: RA-Jay Hung <jay_hung@ralinktech.com>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
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