522 	int rv, cntr;  in wdm_read()  local
531 	cntr = READ_ONCE(desc->length);  in wdm_read()
532 	if (cntr == 0) {  in wdm_read()
597 		cntr = desc->length;  in wdm_read()
601 	if (cntr > count)  in wdm_read()
602 		cntr = count;  in wdm_read()
603 	rv = copy_to_user(buffer, desc->ubuf, cntr);  in wdm_read()
611 	for (i = 0; i < desc->length - cntr; i++)  in wdm_read()
612 		desc->ubuf[i] = desc->ubuf[i + cntr];  in wdm_read()
614 	desc->length -= cntr;  in wdm_read()
621 	rv = cntr;  in wdm_read()