usbmon vs. tcpdump: fix dropped packet count

BugLink: http://bugs.launchpad.net/bugs/890952

commit 236c448cb6e7f82096101e1ace4b77f8b38f82c8 upstream.

Report the number of dropped packets instead of zero
when using the binary usbmon interface with tcpdump.

# tcpdump -i usbmon1 -w dump
tcpdump: listening on usbmon1, link-type USB_LINUX_MMAPPED (USB with padded Linux header), capture size 65535 bytes
^C2155 packets captured
2155 packets received by filter
1019 packets dropped by kernel

Signed-off-by: Johannes Stezenbach <js@sig21.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/usb/mon/mon_bin.c b/drivers/usb/mon/mon_bin.c
index a09dbd243eb..a04b2ff9dd8 100644
--- a/drivers/usb/mon/mon_bin.c
+++ b/drivers/usb/mon/mon_bin.c
@@ -1101,7 +1101,7 @@ static long mon_bin_ioctl(struct file *file, unsigned int cmd, unsigned long arg
                 nevents = mon_bin_queued(rp);
 
                 sp = (struct mon_bin_stats __user *)arg;
-                if (put_user(rp->cnt_lost, &sp->dropped))
+                if (put_user(ndropped, &sp->dropped))
                         return -EFAULT;
                 if (put_user(nevents, &sp->queued))
                         return -EFAULT;