[SCSI] fix async scan add/remove race resulting in an oops

Async scanning introduced a very wide window where the SCSI device is
up and running but has not yet been added to sysfs.  We delay the
adding until all scans have completed to retain the same ordering as
sync scanning.

This delay in visibility causes an oops if a device is removed before
we make it visible because the SCSI removal routines have an inbuilt
assumption that if a device is in SDEV_RUNNING state, it must be
visible (which is not necessarily true in the async scanning case).

Fix this by introducing an additional is_visible flag which we can use
to condition the tear down so we do the right thing for running but
not yet made visible.

Reported-by: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 27 insertions, 36 deletions

diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index 5c7eb63..392d8db 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -854,82 +854,73 @@ int scsi_sysfs_add_sdev(struct scsi_device *sdev)
 	transport_configure_device(&starget->dev);
 	error = device_add(&sdev->sdev_gendev);
 	if (error) {
-		put_device(sdev->sdev_gendev.parent);
 		printk(KERN_INFO "error 1\n");
-		return error;
+		goto out_remove;
 	}
 	error = device_add(&sdev->sdev_dev);
 	if (error) {
 		printk(KERN_INFO "error 2\n");
-		goto clean_device;
+		device_del(&sdev->sdev_gendev);
+		goto out_remove;
 	}
+	transport_add_device(&sdev->sdev_gendev);
+	sdev->is_visible = 1;
 
 	/* create queue files, which may be writable, depending on the host */
 	if (sdev->host->hostt->change_queue_depth)
 		error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_depth_rw);
 	else
 		error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
-	if (error) {
-		__scsi_remove_device(sdev);
-		goto out;
-	}
+	if (error)
+		goto out_remove;
+
 	if (sdev->host->hostt->change_queue_type)
 		error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
 	else
 		error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
-	if (error) {
-		__scsi_remove_device(sdev);
-		goto out;
-	}
+	if (error)
+		goto out_remove;
 
 	error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
 
 	if (error)
+		/* we're treating error on bsg register as non-fatal,
+		 * so pretend nothing went wrong */
 		sdev_printk(KERN_INFO, sdev,
 			    "Failed to register bsg queue, errno=%d\n", error);
 
-	/* we're treating error on bsg register as non-fatal, so pretend
-	 * nothing went wrong */
-	error = 0;
-
 	/* add additional host specific attributes */
 	if (sdev->host->hostt->sdev_attrs) {
 		for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
 			error = device_create_file(&sdev->sdev_gendev,
 					sdev->host->hostt->sdev_attrs[i]);
-			if (error) {
-				__scsi_remove_device(sdev);
-				goto out;
-			}
+			if (error)
+				goto out_remove;
 		}
 	}
 
-	transport_add_device(&sdev->sdev_gendev);
- out:
-	return error;
-
- clean_device:
-	scsi_device_set_state(sdev, SDEV_CANCEL);
-
-	device_del(&sdev->sdev_gendev);
-	transport_destroy_device(&sdev->sdev_gendev);
-	put_device(&sdev->sdev_dev);
-	put_device(&sdev->sdev_gendev);
+	return 0;
 
+ out_remove:
+	__scsi_remove_device(sdev);
 	return error;
+
 }
 
 void __scsi_remove_device(struct scsi_device *sdev)
 {
 	struct device *dev = &sdev->sdev_gendev;
 
-	if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
-		return;
+	if (sdev->is_visible) {
+		if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
+			return;
 
-	bsg_unregister_queue(sdev->request_queue);
-	device_unregister(&sdev->sdev_dev);
-	transport_remove_device(dev);
-	device_del(dev);
+		bsg_unregister_queue(sdev->request_queue);
+		device_unregister(&sdev->sdev_dev);
+		transport_remove_device(dev);
+		device_del(dev);
+	} else
+		put_device(&sdev->sdev_dev);
 	scsi_device_set_state(sdev, SDEV_DEL);
 	if (sdev->host->hostt->slave_destroy)
 		sdev->host->hostt->slave_destroy(sdev);