rt2x00usb: Zero USB padding before sending URB
When USB driver requires padding at the end of frame or URB it will report
this need by increasing return value of get_tx_data_len callback. Common
USB code uses that return value as desired URB length.
Ensure that appropriate part of skb's tailroom exists and is zeroed.
Signed-off-by: Jakub Kicinski <kubakici@wp.pl>
Acked-by: Ivo van Doorn <IvDoorn@gmail.com>
--
drivers/net/wireless/rt2x00/rt2x00usb.c | 16 +++++++++++++---
1 files changed, 13 insertions(+), 3 deletions(-)
Signed-off-by: Gertjan van Wingerde <gwingerde@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 1e31050..2eea386 100644
--- a/drivers/net/wireless/rt2x00/rt2x00usb.c
+++ b/drivers/net/wireless/rt2x00/rt2x00usb.c
@@ -298,12 +298,22 @@
return false;
/*
- * USB devices cannot blindly pass the skb->len as the
- * length of the data to usb_fill_bulk_urb. Pass the skb
- * to the driver to determine what the length should be.
+ * USB devices require certain padding at the end of each frame
+ * and urb. Those paddings are not included in skbs. Pass entry
+ * to the driver to determine what the overall length should be.
*/
length = rt2x00dev->ops->lib->get_tx_data_len(entry);
+ status = skb_padto(entry->skb, length);
+ if (unlikely(status)) {
+ /* TODO: report something more appropriate than IO_FAILED. */
+ WARNING(rt2x00dev, "TX SKB padding error, out of memory\n");
+ set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
+ rt2x00lib_dmadone(entry);
+
+ return false;
+ }
+
usb_fill_bulk_urb(entry_priv->urb, usb_dev,
usb_sndbulkpipe(usb_dev, entry->queue->usb_endpoint),
entry->skb->data, length,