4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Hans de Goede <hdego...@redhat.com>

commit f0386c083c2ce85284dc0b419d7b89c8e567c09f upstream.

When disconnected sometimes the cdc-acm driver logs errors like these:

[20278.039417] cdc_acm 2-2:2.1: urb 9 failed submission with -19
[20278.042924] cdc_acm 2-2:2.1: urb 10 failed submission with -19
[20278.046449] cdc_acm 2-2:2.1: urb 11 failed submission with -19
[20278.049920] cdc_acm 2-2:2.1: urb 12 failed submission with -19
[20278.053442] cdc_acm 2-2:2.1: urb 13 failed submission with -19
[20278.056915] cdc_acm 2-2:2.1: urb 14 failed submission with -19
[20278.060418] cdc_acm 2-2:2.1: urb 15 failed submission with -19

Silence these by not logging errors when the result is -ENODEV.

Signed-off-by: Hans de Goede <hdego...@redhat.com>
Acked-by: Oliver Neukum <oneu...@suse.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/usb/class/cdc-acm.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -377,7 +377,7 @@ static int acm_submit_read_urb(struct ac
 
        res = usb_submit_urb(acm->read_urbs[index], mem_flags);
        if (res) {
-               if (res != -EPERM) {
+               if (res != -EPERM && res != -ENODEV) {
                        dev_err(&acm->data->dev,
                                        "%s - usb_submit_urb failed: %d\n",
                                        __func__, res);


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