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SubjectRe: [PATCH 4/6] scsi: device handlers must have attach and detach methods
On 10/19/2014 06:00 PM, Christoph Hellwig wrote:
> 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);
>
Reviewed-by: Hannes Reinecke <hare@suse.de>

Cheers,

Hannes
--
Dr. Hannes Reinecke zSeries & Storage
hare@suse.de +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: J. Hawn, J. Guild, F. Imendörffer, HRB 16746 (AG Nürnberg)
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