netdev - [PATCH v2 -mm 7/9] netconsole: Use netif_running() in write

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Message-Id: <20070710091956.23907.61655.sendpatchset@cselinux1.cse.iitk.ac.in>
Date:	Tue, 10 Jul 2007 14:49:56 +0530
From:	Satyam Sharma <ssatyam@....iitk.ac.in>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc:	Matt Mackall <mpm@...enic.com>,
	Keiichi Kii <k-keiichi@...jp.nec.com>,
	Satyam Sharma <ssatyam@....iitk.ac.in>,
	Netdev <netdev@...r.kernel.org>,
	Joel Becker <joel.becker@...cle.com>,
	Stephen Hemminger <shemminger@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Miller <davem@...emloft.net>
Subject: [PATCH v2 -mm 7/9] netconsole: Use netif_running() in write_msg()

From: Satyam Sharma <ssatyam@....iitk.ac.in>

[7/9] netconsole: Use netif_running() in write_msg()

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

Signed-off-by: Satyam Sharma <ssatyam@....iitk.ac.in>
Cc: Keiichi Kii <k-keiichi@...jp.nec.com>

---

 drivers/net/netconsole.c |   18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

---

diff -ruNp a/drivers/net/netconsole.c b/drivers/net/netconsole.c
--- a/drivers/net/netconsole.c	2007-07-10 07:26:47.000000000 +0530
+++ b/drivers/net/netconsole.c	2007-07-10 07:45:51.000000000 +0530
@@ -113,16 +113,16 @@ static void write_msg(struct console *co
 	unsigned long flags;
 	struct netconsole_target *nt = &default_target;
 
-	local_irq_save(flags);
-
-	for (left = len; left;) {
-		frag = min(left, MAX_PRINT_CHUNK);
-		netpoll_send_udp(&nt->np, msg, frag);
-		msg += frag;
-		left -= frag;
+	if (netif_running(nt->np.dev)) {
+		local_irq_save(flags);
+		for (left = len; left;) {
+			frag = min(left, MAX_PRINT_CHUNK);
+			netpoll_send_udp(&nt->np, msg, frag);
+			msg += frag;
+			left -= frag;
+		}
+		local_irq_restore(flags);
 	}
-
-	local_irq_restore(flags);
 }
 
 static struct console netconsole = {
-
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