Sending zero byte packets is not neccessarily an error (AF_INET accepts it,
too), so just apply a shortcut. This was discovered because of a non-working
software with WINE. See
http://bugs.winehq.org/show_bug.cgi?id=19397#c86
http://thread.gmane.org/gmane.linux.irda.general/1643
for very detailed debugging information and a testcase. Kudos to Wolfgang for
those!
Reported-by: Wolfgang Schwotzer <wolfgang.schwotzer@gmx.net>
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Tested-by: Mike Evans <mike.evans@cardolan.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
*/
int irttp_udata_request(struct tsap_cb *self, struct sk_buff *skb)
{
*/
int irttp_udata_request(struct tsap_cb *self, struct sk_buff *skb)
{
IRDA_ASSERT(self != NULL, return -1;);
IRDA_ASSERT(self->magic == TTP_TSAP_MAGIC, return -1;);
IRDA_ASSERT(skb != NULL, return -1;);
IRDA_DEBUG(4, "%s()\n", __func__);
IRDA_ASSERT(self != NULL, return -1;);
IRDA_ASSERT(self->magic == TTP_TSAP_MAGIC, return -1;);
IRDA_ASSERT(skb != NULL, return -1;);
IRDA_DEBUG(4, "%s()\n", __func__);
+ /* Take shortcut on zero byte packets */
+ if (skb->len == 0) {
+ ret = 0;
+ goto err;
+ }
+
/* Check that nothing bad happens */
/* Check that nothing bad happens */
- if ((skb->len == 0) || (!self->connected)) {
- IRDA_DEBUG(1, "%s(), No data, or not connected\n",
- __func__);
+ if (!self->connected) {
+ IRDA_DEBUG(1, "%s(), Not connected\n", __func__);
}
EXPORT_SYMBOL(irttp_udata_request);
}
EXPORT_SYMBOL(irttp_udata_request);
IRDA_DEBUG(2, "%s() : queue len = %d\n", __func__,
skb_queue_len(&self->tx_queue));
IRDA_DEBUG(2, "%s() : queue len = %d\n", __func__,
skb_queue_len(&self->tx_queue));
+ /* Take shortcut on zero byte packets */
+ if (skb->len == 0) {
+ ret = 0;
+ goto err;
+ }
+
/* Check that nothing bad happens */
/* Check that nothing bad happens */
- if ((skb->len == 0) || (!self->connected)) {
- IRDA_WARNING("%s: No data, or not connected\n", __func__);
+ if (!self->connected) {
+ IRDA_WARNING("%s: Not connected\n", __func__);
ret = -ENOTCONN;
goto err;
}
ret = -ENOTCONN;
goto err;
}