pktgen: correctly handle failures when adding a device

[ Upstream commit 604dfd6efc9b79bce432f2394791708d8e8f6efc ]

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
	Running:
	Stopped:
	Result: ERROR: can not add device non-exist
	# echo "add_device eth0" > /proc/net/pktgen/kpktgend_0
	# cat /proc/net/pktgen/kpktgend_0
	Running:
	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: Ben Hutchings <ben@decadent.org.uk>

diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index 7bc9991..2ef7da0 100644 (file)
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -1803,10 +1803,13 @@ static ssize_t pktgen_thread_write(struct file *file,
                        return -EFAULT;
                i += len;
                mutex_lock(&pktgen_thread_lock);
-               pktgen_add_device(t, f);
+               ret = pktgen_add_device(t, f);
                mutex_unlock(&pktgen_thread_lock);
-               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;
        }