scsi: use container_of to get at device handler private data
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Reviewed-by: Hannes Reinecke <hare@suse.de>
diff --git a/drivers/scsi/device_handler/scsi_dh_rdac.c b/drivers/scsi/device_handler/scsi_dh_rdac.c
index b850954..ef8caaa 100644
--- a/drivers/scsi/device_handler/scsi_dh_rdac.c
+++ b/drivers/scsi/device_handler/scsi_dh_rdac.c
@@ -181,6 +181,7 @@
};
struct rdac_dh_data {
+ struct scsi_dh_data dh_data;
struct rdac_controller *ctlr;
#define UNINITIALIZED_LUN (1 << 8)
unsigned lun;
@@ -261,9 +262,7 @@
static inline struct rdac_dh_data *get_rdac_data(struct scsi_device *sdev)
{
- struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data;
- BUG_ON(scsi_dh_data == NULL);
- return ((struct rdac_dh_data *) scsi_dh_data->buf);
+ return container_of(sdev->scsi_dh_data, struct rdac_dh_data, dh_data);
}
static struct request *get_rdac_req(struct scsi_device *sdev,
@@ -842,23 +841,20 @@
static int rdac_bus_attach(struct scsi_device *sdev)
{
- struct scsi_dh_data *scsi_dh_data;
struct rdac_dh_data *h;
unsigned long flags;
int err;
char array_name[ARRAY_LABEL_LEN];
char array_id[UNIQUE_ID_LEN];
- scsi_dh_data = kzalloc(sizeof(*scsi_dh_data)
- + sizeof(*h) , GFP_KERNEL);
- if (!scsi_dh_data) {
+ h = kzalloc(sizeof(*h) , GFP_KERNEL);
+ if (!h) {
sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n",
RDAC_NAME);
return -ENOMEM;
}
- scsi_dh_data->scsi_dh = &rdac_dh;
- h = (struct rdac_dh_data *) scsi_dh_data->buf;
+ h->dh_data.scsi_dh = &rdac_dh;
h->lun = UNINITIALIZED_LUN;
h->state = RDAC_STATE_ACTIVE;
@@ -879,7 +875,7 @@
goto clean_ctlr;
spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
- sdev->scsi_dh_data = scsi_dh_data;
+ sdev->scsi_dh_data = &h->dh_data;
spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
sdev_printk(KERN_NOTICE, sdev,
@@ -895,7 +891,7 @@
spin_unlock(&list_lock);
failed:
- kfree(scsi_dh_data);
+ kfree(h);
sdev_printk(KERN_ERR, sdev, "%s: not attached\n",
RDAC_NAME);
return -EINVAL;
@@ -903,12 +899,9 @@
static void rdac_bus_detach( struct scsi_device *sdev )
{
- struct scsi_dh_data *scsi_dh_data;
- struct rdac_dh_data *h;
+ struct rdac_dh_data *h = get_rdac_data(sdev);
unsigned long flags;
- scsi_dh_data = sdev->scsi_dh_data;
- h = (struct rdac_dh_data *) scsi_dh_data->buf;
if (h->ctlr && h->ctlr->ms_queued)
flush_workqueue(kmpath_rdacd);
@@ -920,7 +913,7 @@
if (h->ctlr)
kref_put(&h->ctlr->kref, release_controller);
spin_unlock(&list_lock);
- kfree(scsi_dh_data);
+ kfree(h);
sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", RDAC_NAME);
}