ATA_R_REQUEUE
request->flags |= ATA_R_REQUEUE;
if (request->flags & ATA_R_REQUEUE)
request->flags |= (ATA_R_AT_HEAD | ATA_R_REQUEUE);
request->flags |= (ATA_R_AT_HEAD | ATA_R_REQUEUE);
request->flags |= (ATA_R_READ | ATA_R_AT_HEAD | ATA_R_REQUEUE);
if (!request->callback && !(request->flags & ATA_R_REQUEUE))