[PATCH 1/3] rio500: refuse more than one device at a time

[Oliver Neukum]

This driver is using a global variable. It cannot handle more than
one device at a time. The issue has been exisying since the dawn
of the driver.

Signed-off-by: Oliver Neukum <oneu...@suse.com>
Reported-by: syzbot+35f04d136fc975a70...@syzkaller.appspotmail.com
---
 drivers/usb/misc/rio500.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/misc/rio500.c b/drivers/usb/misc/rio500.c
index 13e4889bc34f..a4b6fbea975f 100644
--- a/drivers/usb/misc/rio500.c
+++ b/drivers/usb/misc/rio500.c
@@ -449,7 +449,12 @@ static int probe_rio(struct usb_interface *intf,
        struct rio_usb_data *rio = &rio_instance;
        int retval;
 
-       dev_info(&intf->dev, "USB Rio found at address %d\n", dev->devnum);
+       if (rio->present) {
+               dev_info(&intf->dev, "Second USB Rio at address %d refused\n", 
dev->devnum);
+               return -EBUSY;
+       } else {
+               dev_info(&intf->dev, "USB Rio found at address %d\n", 
dev->devnum);
+       }
 
        retval = usb_register_dev(intf, &usb_rio_class);
        if (retval) {
-- 
2.16.4