From 4c62ab9c538bc09c38093fa079e6902ea4d42b98 Mon Sep 17 00:00:00 2001 From: Wolfram Sang Date: Tue, 16 Nov 2010 09:50:47 -0800 Subject: 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 Signed-off-by: Wolfram Sang Tested-by: Mike Evans Signed-off-by: David S. Miller --- net/irda/irttp.c | 25 +++++++++++++++++++------ 1 file changed, 19 insertions(+), 6 deletions(-) (limited to 'net/irda') diff --git a/net/irda/irttp.c b/net/irda/irttp.c index 285761e..6cfaeaf 100644 --- 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; } -- cgit v1.1 From 925e277f5221defdc53cbef1ac3ed1803fa32357 Mon Sep 17 00:00:00 2001 From: Wolfram Sang Date: Tue, 16 Nov 2010 09:40:02 +0000 Subject: net: irda: irttp: sync error paths of data- and udata-requests irttp_data_request() returns meaningful errorcodes, while irttp_udata_request() just returns -1 in similar situations. Sync the two and the loglevels of the accompanying output. Signed-off-by: Wolfram Sang Cc: Samuel Ortiz Cc: David Miller Signed-off-by: David S. Miller --- net/irda/irttp.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) (limited to 'net/irda') diff --git a/net/irda/irttp.c b/net/irda/irttp.c index 6cfaeaf..f6054f9 100644 --- a/net/irda/irttp.c +++ b/net/irda/irttp.c @@ -550,7 +550,7 @@ EXPORT_SYMBOL(irttp_close_tsap); */ int irttp_udata_request(struct tsap_cb *self, struct sk_buff *skb) { - int ret = -1; + int ret; IRDA_ASSERT(self != NULL, return -1;); IRDA_ASSERT(self->magic == TTP_TSAP_MAGIC, return -1;); @@ -566,13 +566,14 @@ int irttp_udata_request(struct tsap_cb *self, struct sk_buff *skb) /* Check that nothing bad happens */ if (!self->connected) { - IRDA_DEBUG(1, "%s(), Not connected\n", __func__); + IRDA_WARNING("%s(), Not connected\n", __func__); + ret = -ENOTCONN; goto err; } if (skb->len > self->max_seg_size) { - IRDA_DEBUG(1, "%s(), UData is too large for IrLAP!\n", - __func__); + IRDA_ERROR("%s(), UData is too large for IrLAP!\n", __func__); + ret = -EMSGSIZE; goto err; } -- cgit v1.1