[PATCH] netconsole: bail out when no connection is opened

[PATCH] netconsole: bail out when no connection is opened

[Sascha Hauer]

When no connection is opened we should not call into
the networking stack. Otherwise it can happen that we
delay further execution until the network stack detected
a link (or timed out bringing the link up).

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 net/netconsole.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/net/netconsole.c b/net/netconsole.c
index 2ab19de..86a68e1 100644
--- a/net/netconsole.c
+++ b/net/netconsole.c
@@ -81,6 +81,9 @@ static int nc_getc(struct console_device *cdev)
 					struct nc_priv, cdev);
 	unsigned char c;
 
+	if (!priv->con)
+		return 0;
+
 	while (!kfifo_len(priv->fifo))
 		net_poll();
 
@@ -94,6 +97,9 @@ static int nc_tstc(struct console_device *cdev)
 	struct nc_priv *priv = container_of(cdev,
 					struct nc_priv, cdev);
 
+	if (!priv->con)
+		return 0;
+
 	if (priv->busy)
 		return kfifo_len(priv->fifo) ? 1 : 0;
 
-- 
1.9.1


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