sd_reserve_release
static int sd_reserve_release(dev_t dev, int cmd);
err = sd_reserve_release(dev, SD_RESERVE);
if ((rval = sd_reserve_release(dev, SD_RELEASE)) == 0) {
if (sd_reserve_release(sd_mhreq->dev,
if ((rval = sd_reserve_release(dev, SD_PRIORITY_RESERVE))
if ((err = sd_reserve_release(dev, SD_RESERVE)) != 0) {
if ((sd_reserve_release(dev, SD_RESERVE)) != 0) {
if (sd_reserve_release(dev, SD_RELEASE) != 0) {