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d76123eb35
Introduce a mutex for struct ccwgroup to prevent simuntaneous register/unregister on the same ccwgroup device. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
47 lines
1.3 KiB
C
47 lines
1.3 KiB
C
#ifndef S390_CCWGROUP_H
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#define S390_CCWGROUP_H
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struct ccw_device;
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struct ccw_driver;
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struct ccwgroup_device {
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unsigned long creator_id; /* unique number of the driver */
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enum {
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CCWGROUP_OFFLINE,
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CCWGROUP_ONLINE,
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} state;
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atomic_t onoff;
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struct mutex reg_mutex;
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unsigned int count; /* number of attached slave devices */
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struct device dev; /* master device */
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struct ccw_device *cdev[0]; /* variable number, allocate as needed */
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};
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struct ccwgroup_driver {
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struct module *owner;
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char *name;
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int max_slaves;
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unsigned long driver_id;
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int (*probe) (struct ccwgroup_device *);
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void (*remove) (struct ccwgroup_device *);
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int (*set_online) (struct ccwgroup_device *);
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int (*set_offline) (struct ccwgroup_device *);
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struct device_driver driver; /* this driver */
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};
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extern int ccwgroup_driver_register (struct ccwgroup_driver *cdriver);
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extern void ccwgroup_driver_unregister (struct ccwgroup_driver *cdriver);
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extern int ccwgroup_create (struct device *root,
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unsigned int creator_id,
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struct ccw_driver *gdrv,
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int argc, char *argv[]);
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extern int ccwgroup_probe_ccwdev(struct ccw_device *cdev);
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extern void ccwgroup_remove_ccwdev(struct ccw_device *cdev);
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#define to_ccwgroupdev(x) container_of((x), struct ccwgroup_device, dev)
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#define to_ccwgroupdrv(x) container_of((x), struct ccwgroup_driver, driver)
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#endif
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