[3.5.y.z,extended,stable] Patch "pktgen: correctly handle failures when adding a device" has been added to staging queue

Message ID 1360897859-15728-1-git-send-email-herton.krzesinski@canonical.com
State New
Headers show

Commit Message

Herton Ronaldo Krzesinski Feb. 15, 2013, 3:10 a.m.
This is a note to let you know that I have just added a patch titled

    pktgen: correctly handle failures when adding a device

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:


If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see



From b2afb91d32432821bd73f7a184ec112d84a8af4f Mon Sep 17 00:00:00 2001
From: Cong Wang <amwang@redhat.com>
Date: Sun, 27 Jan 2013 21:14:08 +0000
Subject: [PATCH] pktgen: correctly handle failures when adding a device

commit 604dfd6efc9b79bce432f2394791708d8e8f6efc upstream.

The return value of pktgen_add_device() is not checked, so
even if we fail to add some device, for example, non-exist one,
we still see "OK:...". This patch fixes it.

After this patch, I got:

	# echo "add_device non-exist" > /proc/net/pktgen/kpktgend_0
	-bash: echo: write error: No such device
	# cat /proc/net/pktgen/kpktgend_0
	Result: ERROR: can not add device non-exist
	# echo "add_device eth0" > /proc/net/pktgen/kpktgend_0
	# cat /proc/net/pktgen/kpktgend_0
	Stopped: eth0
	Result: OK: add_device=eth0

(Candidate for -stable)

Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Cong Wang <amwang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
 net/core/pktgen.c |    9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)



diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index aa278cd..2a42802 100644
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -1797,10 +1797,13 @@  static ssize_t pktgen_thread_write(struct file *file,
 			return -EFAULT;
 		i += len;
-		pktgen_add_device(t, f);
+		ret = pktgen_add_device(t, f);
-		ret = count;
-		sprintf(pg_result, "OK: add_device=%s", f);
+		if (!ret) {
+			ret = count;
+			sprintf(pg_result, "OK: add_device=%s", f);
+		} else
+			sprintf(pg_result, "ERROR: can not add device %s", f);
 		goto out;