Symbol: acm_wb_is_avail
drivers/usb/class/cdc-acm.c
875
return acm_wb_is_avail(acm) ? acm->writesize : 0;
drivers/usb/class/cdc-acm.c
903
return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;