Commit 4c62ab9c authored by Wolfram Sang's avatar Wolfram Sang Committed by David S. Miller

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: default avatarWolfgang Schwotzer <wolfgang.schwotzer@gmx.net>
Signed-off-by: default avatarWolfram Sang <w.sang@pengutronix.de>
Tested-by: default avatarMike Evans <mike.evans@cardolan.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 3b42a96d
...@@ -550,16 +550,23 @@ EXPORT_SYMBOL(irttp_close_tsap); ...@@ -550,16 +550,23 @@ EXPORT_SYMBOL(irttp_close_tsap);
*/ */
int irttp_udata_request(struct tsap_cb *self, struct sk_buff *skb) int irttp_udata_request(struct tsap_cb *self, struct sk_buff *skb)
{ {
int ret = -1;
IRDA_ASSERT(self != NULL, return -1;); IRDA_ASSERT(self != NULL, return -1;);
IRDA_ASSERT(self->magic == TTP_TSAP_MAGIC, return -1;); IRDA_ASSERT(self->magic == TTP_TSAP_MAGIC, return -1;);
IRDA_ASSERT(skb != NULL, return -1;); IRDA_ASSERT(skb != NULL, return -1;);
IRDA_DEBUG(4, "%s()\n", __func__); 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)) { if (!self->connected) {
IRDA_DEBUG(1, "%s(), No data, or not connected\n", IRDA_DEBUG(1, "%s(), Not connected\n", __func__);
__func__);
goto err; goto err;
} }
...@@ -576,7 +583,7 @@ int irttp_udata_request(struct tsap_cb *self, struct sk_buff *skb) ...@@ -576,7 +583,7 @@ int irttp_udata_request(struct tsap_cb *self, struct sk_buff *skb)
err: err:
dev_kfree_skb(skb); dev_kfree_skb(skb);
return -1; return ret;
} }
EXPORT_SYMBOL(irttp_udata_request); EXPORT_SYMBOL(irttp_udata_request);
...@@ -599,9 +606,15 @@ int irttp_data_request(struct tsap_cb *self, struct sk_buff *skb) ...@@ -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__, IRDA_DEBUG(2, "%s() : queue len = %d\n", __func__,
skb_queue_len(&self->tx_queue)); 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)) { if (!self->connected) {
IRDA_WARNING("%s: No data, or not connected\n", __func__); IRDA_WARNING("%s: Not connected\n", __func__);
ret = -ENOTCONN; ret = -ENOTCONN;
goto err; goto err;
} }
......
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