irda: irttp: allow zero byte packets

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>

diff --git a/net/irda/irttp.c b/net/irda/irttp.c
index 285761e..6cfaeaf 100644 (file)
--- a/net/irda/irttp.c
+++ b/net/irda/irttp.c
@@ -550,16 +550,23 @@ EXPORT_SYMBOL(irttp_close_tsap);
  */
 int irttp_udata_request(struct tsap_cb *self, struct sk_buff *skb)
 {
+       int ret = -1;
+
        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 */
-       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__);
                goto err;
        }
 
@@ -576,7 +583,7 @@ int irttp_udata_request(struct tsap_cb *self, struct sk_buff *skb)
 
 err:
        dev_kfree_skb(skb);
-       return -1;
+       return ret;
 }
 EXPORT_SYMBOL(irttp_udata_request);
 
@@ -599,9 +606,15 @@ int irttp_data_request(struct tsap_cb *self, struct sk_buff *skb)
        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 */
-       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;
        }