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-rw-r--r--drivers/usb/class/cdc-wdm.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c
index c553decb54..c8262e2f29 100644
--- a/drivers/usb/class/cdc-wdm.c
+++ b/drivers/usb/class/cdc-wdm.c
@@ -485,6 +485,7 @@ out_free_mem:
static int service_outstanding_interrupt(struct wdm_device *desc)
{
int rv = 0;
+ int used;
/* submit read urb only if the device is waiting for it */
if (!desc->resp_count || !--desc->resp_count)
@@ -499,7 +500,10 @@ static int service_outstanding_interrupt(struct wdm_device *desc)
goto out;
}
- set_bit(WDM_RESPONDING, &desc->flags);
+ used = test_and_set_bit(WDM_RESPONDING, &desc->flags);
+ if (used)
+ goto out;
+
spin_unlock_irq(&desc->iuspin);
rv = usb_submit_urb(desc->response, GFP_KERNEL);
spin_lock_irq(&desc->iuspin);