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authorChristoph Hellwig <hch@lst.de>2015-08-27 15:16:59 +0300
committerJames Bottomley <JBottomley@Odin.com>2015-08-28 23:14:57 +0300
commitee14c674e8fc57251223054fb52dc0ecfe711028 (patch)
tree6f65bb8fd2380c4abed006139c8d6c820ae3d08f /drivers/scsi/scsi_dh.c
parentd95dbff2a41e934cd8789734b34dc591e78ba11c (diff)
downloadlinux-ee14c674e8fc57251223054fb52dc0ecfe711028.tar.xz
scsi_dh: kill struct scsi_dh_data
Add a ->handler and a ->handler_data field to struct scsi_device and kill this indirection. Also move struct scsi_device_handler to scsi_dh.h so that changes to it don't require rebuilding every SCSI LLDD. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: James Bottomley <JBottomley@Odin.com>
Diffstat (limited to 'drivers/scsi/scsi_dh.c')
-rw-r--r--drivers/scsi/scsi_dh.c75
1 files changed, 28 insertions, 47 deletions
diff --git a/drivers/scsi/scsi_dh.c b/drivers/scsi/scsi_dh.c
index 9c153309c96b..33c1148ff3b5 100644
--- a/drivers/scsi/scsi_dh.c
+++ b/drivers/scsi/scsi_dh.c
@@ -126,26 +126,20 @@ static struct scsi_device_handler *scsi_dh_lookup(const char *name)
static int scsi_dh_handler_attach(struct scsi_device *sdev,
struct scsi_device_handler *scsi_dh)
{
- struct scsi_dh_data *d;
+ int error;
if (!try_module_get(scsi_dh->module))
return -EINVAL;
- d = scsi_dh->attach(sdev);
- if (IS_ERR(d)) {
- sdev_printk(KERN_ERR, sdev, "%s: Attach failed (%ld)\n",
- scsi_dh->name, PTR_ERR(d));
+ error = scsi_dh->attach(sdev);
+ if (error) {
+ sdev_printk(KERN_ERR, sdev, "%s: Attach failed (%d)\n",
+ scsi_dh->name, error);
module_put(scsi_dh->module);
- return PTR_ERR(d);
- }
-
- d->scsi_dh = scsi_dh;
- d->sdev = sdev;
+ } else
+ sdev->handler = scsi_dh;
- spin_lock_irq(sdev->request_queue->queue_lock);
- sdev->scsi_dh_data = d;
- spin_unlock_irq(sdev->request_queue->queue_lock);
- return 0;
+ return error;
}
/*
@@ -154,17 +148,9 @@ static int scsi_dh_handler_attach(struct scsi_device *sdev,
*/
static void scsi_dh_handler_detach(struct scsi_device *sdev)
{
- struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data;
- struct scsi_device_handler *scsi_dh = scsi_dh_data->scsi_dh;
-
- scsi_dh->detach(sdev);
-
- spin_lock_irq(sdev->request_queue->queue_lock);
- sdev->scsi_dh_data = NULL;
- spin_unlock_irq(sdev->request_queue->queue_lock);
-
- sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", scsi_dh->name);
- module_put(scsi_dh->module);
+ sdev->handler->detach(sdev);
+ sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", sdev->handler->name);
+ module_put(sdev->handler->module);
}
/*
@@ -182,7 +168,7 @@ store_dh_state(struct device *dev, struct device_attribute *attr,
sdev->sdev_state == SDEV_DEL)
return -ENODEV;
- if (!sdev->scsi_dh_data) {
+ if (!sdev->handler) {
/*
* Attach to a device handler
*/
@@ -191,7 +177,6 @@ store_dh_state(struct device *dev, struct device_attribute *attr,
return err;
err = scsi_dh_handler_attach(sdev, scsi_dh);
} else {
- scsi_dh = sdev->scsi_dh_data->scsi_dh;
if (!strncmp(buf, "detach", 6)) {
/*
* Detach from a device handler
@@ -202,8 +187,8 @@ store_dh_state(struct device *dev, struct device_attribute *attr,
/*
* Activate a device handler
*/
- if (scsi_dh->activate)
- err = scsi_dh->activate(sdev, NULL, NULL);
+ if (sdev->handler->activate)
+ err = sdev->handler->activate(sdev, NULL, NULL);
else
err = 0;
}
@@ -217,10 +202,10 @@ show_dh_state(struct device *dev, struct device_attribute *attr, char *buf)
{
struct scsi_device *sdev = to_scsi_device(dev);
- if (!sdev->scsi_dh_data)
+ if (!sdev->handler)
return snprintf(buf, 20, "detached\n");
- return snprintf(buf, 20, "%s\n", sdev->scsi_dh_data->scsi_dh->name);
+ return snprintf(buf, 20, "%s\n", sdev->handler->name);
}
static struct device_attribute scsi_dh_state_attr =
@@ -247,7 +232,7 @@ int scsi_dh_add_device(struct scsi_device *sdev)
void scsi_dh_remove_device(struct scsi_device *sdev)
{
- if (sdev->scsi_dh_data)
+ if (sdev->handler)
scsi_dh_handler_detach(sdev);
device_remove_file(&sdev->sdev_gendev, &scsi_dh_state_attr);
}
@@ -316,7 +301,6 @@ int scsi_dh_activate(struct request_queue *q, activate_complete fn, void *data)
int err = 0;
unsigned long flags;
struct scsi_device *sdev;
- struct scsi_device_handler *scsi_dh = NULL;
struct device *dev = NULL;
spin_lock_irqsave(q->queue_lock, flags);
@@ -329,10 +313,8 @@ int scsi_dh_activate(struct request_queue *q, activate_complete fn, void *data)
return err;
}
- if (sdev->scsi_dh_data)
- scsi_dh = sdev->scsi_dh_data->scsi_dh;
dev = get_device(&sdev->sdev_gendev);
- if (!scsi_dh || !dev ||
+ if (!sdev->handler || !dev ||
sdev->sdev_state == SDEV_CANCEL ||
sdev->sdev_state == SDEV_DEL)
err = SCSI_DH_NOSYS;
@@ -346,8 +328,8 @@ int scsi_dh_activate(struct request_queue *q, activate_complete fn, void *data)
goto out;
}
- if (scsi_dh->activate)
- err = scsi_dh->activate(sdev, fn, data);
+ if (sdev->handler->activate)
+ err = sdev->handler->activate(sdev, fn, data);
out:
put_device(dev);
return err;
@@ -369,19 +351,18 @@ int scsi_dh_set_params(struct request_queue *q, const char *params)
int err = -SCSI_DH_NOSYS;
unsigned long flags;
struct scsi_device *sdev;
- struct scsi_device_handler *scsi_dh = NULL;
spin_lock_irqsave(q->queue_lock, flags);
sdev = q->queuedata;
- if (sdev && sdev->scsi_dh_data)
- scsi_dh = sdev->scsi_dh_data->scsi_dh;
- if (scsi_dh && scsi_dh->set_params && get_device(&sdev->sdev_gendev))
+ if (sdev->handler &&
+ sdev->handler->set_params &&
+ get_device(&sdev->sdev_gendev))
err = 0;
spin_unlock_irqrestore(q->queue_lock, flags);
if (err)
return err;
- err = scsi_dh->set_params(sdev, params);
+ err = sdev->handler->set_params(sdev, params);
put_device(&sdev->sdev_gendev);
return err;
}
@@ -413,8 +394,8 @@ int scsi_dh_attach(struct request_queue *q, const char *name)
if (err)
return err;
- if (sdev->scsi_dh_data) {
- if (sdev->scsi_dh_data->scsi_dh != scsi_dh)
+ if (sdev->handler) {
+ if (sdev->handler != scsi_dh)
err = -EBUSY;
goto out_put_device;
}
@@ -451,8 +432,8 @@ const char *scsi_dh_attached_handler_name(struct request_queue *q, gfp_t gfp)
if (!sdev)
return NULL;
- if (sdev->scsi_dh_data)
- handler_name = kstrdup(sdev->scsi_dh_data->scsi_dh->name, gfp);
+ if (sdev->handler)
+ handler_name = kstrdup(sdev->handler->name, gfp);
put_device(&sdev->sdev_gendev);
return handler_name;