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Message-ID: <tkrat.d31b842d0b99b88a@s5r6.in-berlin.de>
Date: Mon, 2 Apr 2007 02:24:27 +0200 (CEST)
From: Stefan Richter <stefanr@...6.in-berlin.de>
To: linux1394-devel@...ts.sourceforge.net
cc: netdev@...r.kernel.org
Subject: [PATCH linux1394-2.6.git 14/15] ieee1394: eth1394: correct return
codes in hard_start_xmit
This patch actually doesn't change anything because there was always 0
== NETDEV_TX_OK returned before.
TODO: Return NETDEV_TX_BUSY in error case and test in different error
conditions.
Signed-off-by: Stefan Richter <stefanr@...6.in-berlin.de>
---
drivers/ieee1394/eth1394.c | 34 ++++++++++++++++------------------
1 file changed, 16 insertions(+), 18 deletions(-)
Index: linux/drivers/ieee1394/eth1394.c
===================================================================
--- linux.orig/drivers/ieee1394/eth1394.c
+++ linux/drivers/ieee1394/eth1394.c
@@ -1531,7 +1531,6 @@ static int ether1394_tx(struct sk_buff *
unsigned long flags;
nodeid_t dest_node;
eth1394_tx_type tx_type;
- int ret = 0;
unsigned int tx_len;
unsigned int max_payload;
u16 dg_size;
@@ -1541,26 +1540,20 @@ static int ether1394_tx(struct sk_buff *
struct eth1394_node_info *node_info = NULL;
ptask = kmem_cache_alloc(packet_task_cache, GFP_ATOMIC);
- if (ptask == NULL) {
- ret = -ENOMEM;
+ if (ptask == NULL)
goto fail;
- }
/* XXX Ignore this for now. Noticed that when MacOSX is the IRM,
* it does not set our validity bit. We need to compensate for
* that somewhere else, but not in eth1394. */
#if 0
- if ((priv->host->csr.broadcast_channel & 0xc0000000) != 0xc0000000) {
- ret = -EAGAIN;
+ if ((priv->host->csr.broadcast_channel & 0xc0000000) != 0xc0000000)
goto fail;
- }
#endif
skb = skb_share_check(skb, GFP_ATOMIC);
- if (!skb) {
- ret = -ENOMEM;
+ if (!skb)
goto fail;
- }
/* Get rid of the fake eth1394 header, but save a pointer */
eth = (struct eth1394hdr *)skb->data;
@@ -1587,16 +1580,13 @@ static int ether1394_tx(struct sk_buff *
node = eth1394_find_node_guid(&priv->ip_node_list,
be64_to_cpu(guid));
- if (!node) {
- ret = -EAGAIN;
+ if (!node)
goto fail;
- }
+
node_info =
(struct eth1394_node_info *)node->ud->device.driver_data;
- if (node_info->fifo == CSR1212_INVALID_ADDR_SPACE) {
- ret = -EAGAIN;
+ if (node_info->fifo == CSR1212_INVALID_ADDR_SPACE)
goto fail;
- }
dest_node = node->ud->ne->nodeid;
max_payload = node_info->maxpayload;
@@ -1643,7 +1633,7 @@ static int ether1394_tx(struct sk_buff *
goto fail;
netif_wake_queue(dev);
- return 0;
+ return NETDEV_TX_OK;
fail:
if (ptask)
kmem_cache_free(packet_task_cache, ptask);
@@ -1659,7 +1649,15 @@ fail:
if (netif_queue_stopped(dev))
netif_wake_queue(dev);
- return 0; /* returning non-zero causes serious problems */
+ /*
+ * FIXME: According to a patch from 2003-02-26, "returning non-zero
+ * causes serious problems" here, allegedly. Before that patch,
+ * -ERRNO was returned which is not appropriate under Linux 2.6.
+ * Perhaps more needs to be done? Stop the queue in serious
+ * conditions and restart it elsewhere?
+ */
+ /* return NETDEV_TX_BUSY; */
+ return NETDEV_TX_OK;
}
static void ether1394_get_drvinfo(struct net_device *dev,
--
Stefan Richter
-=====-=-=== -=-- ---=-
http://arcgraph.de/sr/
-
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