[PATCH 4/6] scsi: device handlers must have attach and detach methods

[Christoph Hellwig]

Signed-off-by: Christoph Hellwig <h...@lst.de>
Reviewed-by: Hannes Reinecke <h...@suse.de>
---
 drivers/scsi/device_handler/scsi_dh.c | 25 +++++++++++++------------
 1 file changed, 13 insertions(+), 12 deletions(-)

diff --git a/drivers/scsi/device_handler/scsi_dh.c 
b/drivers/scsi/device_handler/scsi_dh.c
index 1a8dbf3..d8a8aac 100644
--- a/drivers/scsi/device_handler/scsi_dh.c
+++ b/drivers/scsi/device_handler/scsi_dh.c
@@ -108,19 +108,17 @@ static int scsi_dh_handler_attach(struct scsi_device 
*sdev,
                return 0;
        }
 
-       if (scsi_dh->attach) {
-               if (!try_module_get(scsi_dh->module))
-                       return -EINVAL;
-
-               err = scsi_dh->attach(sdev);
-               if (err) {
-                       module_put(scsi_dh->module);
-                       return err;
-               }
+       if (!try_module_get(scsi_dh->module))
+               return -EINVAL;
 
-               kref_init(&sdev->scsi_dh_data->kref);
-               sdev->scsi_dh_data->sdev = sdev;
+       err = scsi_dh->attach(sdev);
+       if (err) {
+               module_put(scsi_dh->module);
+               return err;
        }
+
+       kref_init(&sdev->scsi_dh_data->kref);
+       sdev->scsi_dh_data->sdev = sdev;
        return err;
 }
 
@@ -154,7 +152,7 @@ static void scsi_dh_handler_detach(struct scsi_device *sdev,
        if (!scsi_dh)
                scsi_dh = sdev->scsi_dh_data->scsi_dh;
 
-       if (scsi_dh && scsi_dh->detach)
+       if (scsi_dh)
                kref_put(&sdev->scsi_dh_data->kref, __detach_handler);
 }
 
@@ -343,6 +341,9 @@ int scsi_register_device_handler(struct scsi_device_handler 
*scsi_dh)
        if (get_device_handler(scsi_dh->name))
                return -EBUSY;
 
+       if (!scsi_dh->attach || !scsi_dh->detach)
+               return -EINVAL;
+
        spin_lock(&list_lock);
        list_add(&scsi_dh->list, &scsi_dh_list);
        spin_unlock(&list_lock);
-- 
1.9.1

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