net: expose eth_is_active() function to test network device state

The previous eth_device struct returned by eth_get_dev() allowed
code to directly query the state member field. However, with
CONFIG_DM_ETH this data gets encapsulated (i.e. private), and
eth_get_dev() returns a udevice struct 'abstraction' instead.

This breaks legacy code relying on the former behaviour - e.g.
netconsole.
(see http://lists.denx.de/pipermail/u-boot/2015-June/216528.html)

The patch introduces a method to retrieve the ethernet device
state in a 'clean' and uniform way, supporting both legacy code
and driver model. The new function eth_is_active() accepts a
device struct pointer and tests it for ETH_STATE_ACTIVE.

Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

1 files changed, 17 insertions, 1 deletions

diff --git a/net/eth.c b/net/eth.c
index 26520d3038..2e24b55726 100644
--- a/net/eth.c
+++ b/net/eth.c
@@ -389,6 +389,17 @@ void eth_halt(void)
 	priv->state = ETH_STATE_PASSIVE;
 }
 
+int eth_is_active(struct udevice *dev)
+{
+	struct eth_device_priv *priv;
+
+	if (!dev || !device_active(dev))
+		return 0;
+
+	priv = dev_get_uclass_priv(dev);
+	return priv->state == ETH_STATE_ACTIVE;
+}
+
 int eth_send(void *packet, int length)
 {
 	struct udevice *current;
@@ -580,7 +591,7 @@ UCLASS_DRIVER(eth) = {
 	.per_device_auto_alloc_size = sizeof(struct eth_device_priv),
 	.flags		= DM_UC_FLAG_SEQ_ALIAS,
 };
-#endif
+#endif /* #ifdef CONFIG_DM_ETH */
 
 #ifndef CONFIG_DM_ETH
 
@@ -918,6 +929,11 @@ void eth_halt(void)
 	eth_current->state = ETH_STATE_PASSIVE;
 }
 
+int eth_is_active(struct eth_device *dev)
+{
+	return dev && dev->state == ETH_STATE_ACTIVE;
+}
+
 int eth_send(void *packet, int length)
 {
 	if (!eth_current)