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authorSteve Glendinning <steve.glendinning@smsc.com>2009-09-22 04:00:27 +0000
committerDavid S. Miller <davem@davemloft.net>2009-09-22 14:28:26 -0700
commitec4756238239f1a331d9fb95bad8b281dad56855 (patch)
tree774936e88cb6c8527473e8e4d30b6a9dc914c1f2 /include/linux/usb
parent36989b90879c785f95b877bdcf65a2527dadd893 (diff)
smsc95xx: fix transmission where ZLP is expected
Usbnet framework assumes USB hardware doesn't handle zero length packets, but SMSC LAN95xx requires these to be sent for correct operation. This patch fixes an easily reproducible tx lockup when sending a frame that results in exactly 512 bytes in a USB transmission (e.g. a UDP frame with 458 data bytes, due to IP headers and our USB headers). It adds an extra flag to usbnet for the hardware driver to indicate that it can handle and requires the zero length packets. This patch should not affect other usbnet users, please also consider for -stable. Signed-off-by: Steve Glendinning <steve.glendinning@smsc.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/usb')
-rw-r--r--include/linux/usb/usbnet.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/usb/usbnet.h b/include/linux/usb/usbnet.h
index bb69e256cd1..f8147305205 100644
--- a/include/linux/usb/usbnet.h
+++ b/include/linux/usb/usbnet.h
@@ -89,6 +89,7 @@ struct driver_info {
#define FLAG_FRAMING_AX 0x0040 /* AX88772/178 packets */
#define FLAG_WLAN 0x0080 /* use "wlan%d" names */
#define FLAG_AVOID_UNLINK_URBS 0x0100 /* don't unlink urbs at usbnet_stop() */
+#define FLAG_SEND_ZLP 0x0200 /* hw requires ZLPs are sent */
/* init device ... can sleep, or cause probe() failure */