[NET] netconsole: Use netif_running() in write_msg()

Based upon initial work by Keiichi Kii <k-keiichi@bx.jp.nec.com>.

Avoid unnecessarily disabling interrupts and calling netpoll_send_udp() if the
corresponding local interface is not up.

Signed-off-by: Satyam Sharma <satyam@infradead.org>
Acked-by: Keiichi Kii <k-keiichi@bx.jp.nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c
index e56aa6c9743f6934d8eb4408aa4ba3c65c97efef..75cb76139ddc149bbfe56be3f9ec14e116b77dd3 100644 (file)
--- a/drivers/net/netconsole.c
+++ b/drivers/net/netconsole.c
@@ -75,16 +75,16 @@ static void write_msg(struct console *con, const char *msg, unsigned int len)
        int frag, left;
        unsigned long flags;
 
-       local_irq_save(flags);
-
-       for (left = len; left;) {
-               frag = min(left, MAX_PRINT_CHUNK);
-               netpoll_send_udp(&np, msg, frag);
-               msg += frag;
-               left -= frag;
+       if (netif_running(np.dev)) {
+               local_irq_save(flags);
+               for (left = len; left;) {
+                       frag = min(left, MAX_PRINT_CHUNK);
+                       netpoll_send_udp(&np, msg, frag);
+                       msg += frag;
+                       left -= frag;
+               }
+               local_irq_restore(flags);
        }
-
-       local_irq_restore(flags);
 }
 
 static struct console netconsole = {