USB: cdc-acm: Do not log urb submission errors on disconnect

USB: cdc-acm: Do not log urb submission errors on disconnect

[Oliver Neukum]

Am Sonntag, den 14.01.2018, 16:09 +0100 schrieb Hans de Goede:
> 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 <hdegoede@redhat.com>
Acked-by: Oliver Neukum <oneukum@suse.com>
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USB: cdc-acm: Do not log urb submission errors on disconnect

[Hans de Goede]

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 <hdegoede@redhat.com>
---
 drivers/usb/class/cdc-acm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 8e0636c963a7..6c64ab6e80fa 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -425,7 +425,7 @@ static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags)
 
 	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,
 				"urb %d failed submission with %d\n",
 				index, res);