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Subject[PATCH 4/6] scsi: device handlers must have attach and detach methods
Date
Signed-off-by: Christoph Hellwig <hch@lst.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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