sd: delay calling free_opal_dev

Call free_opal_dev from scsi_disk_release as the opal_dev field is accessed
from the ioctl handler, which isn't synchronized vs sd_release and thus
can be accessed during or after sd_release was called.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20220308055200.735835-7-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/scsi/sd.c

@@ -3632,8 +3632,6 @@ static int sd_remove(struct device *dev)
 	del_gendisk(sdkp->disk);
 	sd_shutdown(dev);
 
-	free_opal_dev(sdkp->opal_dev);
-
 	mutex_lock(&sd_ref_mutex);
 	dev_set_drvdata(dev, NULL);
 	put_device(&sdkp->disk_dev);
@@ -3675,6 +3673,7 @@ static void scsi_disk_release(struct device *dev)
 
 	sd_zbc_release_disk(sdkp);
 	put_device(&sdkp->device->sdev_gendev);
+	free_opal_dev(sdkp->opal_dev);
 
 	kfree(sdkp);
 }