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s390/ccwgroup: introduce ccwgroup_create_dev

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Add a new interface for drivers to create a group device. Via the old
interface ccwgroup_create_from_string we would create a virtual device
in a way that only the caller of this function would match and bind to.

Via the new ccwgroup_create_dev we stop playing games with the driver
core and directly set the driver of the new group device. For drivers
which have todo additional setup steps (like setting driver_data)
provide a new setup driver callback.

Reviewed-by: Cornelia Huck <[email protected]>
Signed-off-by: Sebastian Ott <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
This commit is contained in:
Sebastian Ott 2012-05-15 17:49:12 +02:00 • committed by Martin Schwidefsky
commit f2962dae0e
2 changed files with 50 additions and 9 deletions
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54
drivers/s390/cio/ccwgroup.c
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@ -1,7 +1,7 @@
/*
* bus driver for ccwgroup
*
* Copyright IBM Corp. 2002, 2009
* Copyright IBM Corp. 2002, 2012
*
* Author(s): Arnd Bergmann (arndb@de.ibm.com)
* Cornelia Huck (cornelia.huck@de.ibm.com)
@ -291,14 +291,15 @@ static int __is_valid_bus_id(char bus_id[CCW_BUS_ID_SIZE])
}
/**
* ccwgroup_create_from_string() - create and register a ccw group device
* @root: parent device for the new device
* ccwgroup_create_dev() - create and register a ccw group device
* @parent: parent device for the new device
* @creator_id: identifier of creating driver
* @cdrv: ccw driver of slave devices
* @gdrv: driver for the new group device
* @num_devices: number of slave devices
* @buf: buffer containing comma separated bus ids of slave devices
*
* Create and register a new ccw group device as a child of @root. Slave
* Create and register a new ccw group device as a child of @parent. Slave
* devices are obtained from the list of bus ids given in @buf and must all
* belong to @cdrv.
* Returns:
@ -306,9 +307,9 @@ static int __is_valid_bus_id(char bus_id[CCW_BUS_ID_SIZE])
* Context:
* non-atomic
*/
int ccwgroup_create_from_string(struct device *root, unsigned int creator_id,
struct ccw_driver *cdrv, int num_devices,
const char *buf)
int ccwgroup_create_dev(struct device *parent, unsigned int creator_id,
struct ccw_driver *cdrv, struct ccwgroup_driver *gdrv,
int num_devices, const char *buf)
{
struct ccwgroup_device *gdev;
int rc, i;
@ -323,10 +324,13 @@ int ccwgroup_create_from_string(struct device *root, unsigned int creator_id,
atomic_set(&gdev->onoff, 0);
mutex_init(&gdev->reg_mutex);
mutex_lock(&gdev->reg_mutex);
gdev->creator_id = creator_id;
if (gdrv)
gdev->creator_id = gdrv->driver_id;
else
gdev->creator_id = creator_id;
gdev->count = num_devices;
gdev->dev.bus = &ccwgroup_bus_type;
gdev->dev.parent = root;
gdev->dev.parent = parent;
gdev->dev.release = ccwgroup_release;
device_initialize(&gdev->dev);
@ -373,6 +377,13 @@ int ccwgroup_create_from_string(struct device *root, unsigned int creator_id,
dev_set_name(&gdev->dev, "%s", dev_name(&gdev->cdev[0]->dev));
gdev->dev.groups = ccwgroup_attr_groups;
if (gdrv) {
gdev->dev.driver = &gdrv->driver;
rc = gdrv->setup ? gdrv->setup(gdev) : 0;
if (rc)
goto error;
}
rc = device_add(&gdev->dev);
if (rc)
goto error;
@ -397,6 +408,31 @@ error:
put_device(&gdev->dev);
return rc;
}
EXPORT_SYMBOL(ccwgroup_create_dev);
/**
* ccwgroup_create_from_string() - create and register a ccw group device
* @root: parent device for the new device
* @creator_id: identifier of creating driver
* @cdrv: ccw driver of slave devices
* @num_devices: number of slave devices
* @buf: buffer containing comma separated bus ids of slave devices
*
* Create and register a new ccw group device as a child of @root. Slave
* devices are obtained from the list of bus ids given in @buf and must all
* belong to @cdrv.
* Returns:
* %0 on success and an error code on failure.
* Context:
* non-atomic
*/
int ccwgroup_create_from_string(struct device *root, unsigned int creator_id,
struct ccw_driver *cdrv, int num_devices,
const char *buf)
{
return ccwgroup_create_dev(root, creator_id, cdrv, NULL,
num_devices, buf);
}
EXPORT_SYMBOL(ccwgroup_create_from_string);
static int ccwgroup_notifier(struct notifier_block *nb, unsigned long action,