From: Alan Stern <stern@rowland.harvard.edu>
Date: Mon, 6 Oct 2008 15:24:26 +0000 (-0400)
Subject: USB: snoop processes opening usbfs device files
X-Git-Tag: v2.6.28-rc1~254^2~35
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=2da41d5f6c036e7a6e496a7e601a685f8b87acb0;p=linux-2.6-omap-h63xx.git

USB: snoop processes opening usbfs device files

This patch (as1148) adds a new "snoop" message to usbfs when a device
file is opened, identifying the process responsible.  This comes in
extremely handy when trying to determine which program is doing some
unwanted USB access.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index 7a4fa791dc1..528befdcc78 100644
--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -624,6 +624,8 @@ static int usbdev_open(struct inode *inode, struct file *file)
 	smp_wmb();
 	list_add_tail(&ps->list, &dev->filelist);
 	file->private_data = ps;
+	snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
+			current->comm);
  out:
 	if (ret) {
 		kfree(ps);