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netconsole: bail out when no connection is opened 

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>
This commit is contained in:
Sascha Hauer 2014-03-13 22:09:47 +01:00
parent 88ffe72278
commit 33987e9600
1 changed files with 6 additions and 0 deletions
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6
net/netconsole.c
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@ -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;