If a device splits up a control message and a reset() happens
between the parts, the message is lost and already recieved parts
must be dropped.
Signed-off-by: Oliver Neukum <oneukum@xxxxxxxx>
Fixes: 1aba579f3cf51 ("cdc-acm: handle read pipe errors")
---
drivers/usb/class/cdc-acm.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index f9b40a9dc4d3..86e477cd5c48 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -1636,6 +1636,7 @@ static int acm_pre_reset(struct usb_interface *intf)
struct acm *acm = usb_get_intfdata(intf);
clear_bit(EVENT_RX_STALL, &acm->flags);
+ acm->nb_index = 0; /* pending control transfers are lost */
return 0;
}
--
2.16.4
