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Xen: consolidate and simplify struct xenbus_driver instantiation

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The 'name', 'owner', and 'mod_name' members are redundant with the
identically named fields in the 'driver' sub-structure. Rather than
switching each instance to specify these fields explicitly, introduce
a macro to simplify this.

Eliminate further redundancy by allowing the drvname argument to
DEFINE_XENBUS_DRIVER() to be blank (in which case the first entry from
the ID table will be used for .driver.name).

Also eliminate the questionable xenbus_register_{back,front}end()
wrappers - their sole remaining purpose was the checking of the
'owner' field, proper setting of which shouldn't be an issue anymore
when the macro gets used.

v2: Restore DRV_NAME for the driver name in xen-pciback.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Cc: Ian Campbell <ian.campbell@citrix.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Jan Beulich
2011-12-22 09:08:13 +00:00
committed by Konrad Rzeszutek Wilk
parent 2e16341438
commit 73db144b58
13 changed files with 44 additions and 92 deletions
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31
include/xen/xenbus.h
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@@ -85,8 +85,6 @@ struct xenbus_device_id
/* A xenbus driver. */
struct xenbus_driver {
char *name;
struct module *owner;
const struct xenbus_device_id *ids;
int (*probe)(struct xenbus_device *dev,
const struct xenbus_device_id *id);
@@ -101,31 +99,20 @@ struct xenbus_driver {
int (*is_ready)(struct xenbus_device *dev);
};
#define DEFINE_XENBUS_DRIVER(var, drvname, methods...) \
struct xenbus_driver var ## _driver = { \
.driver.name = drvname + 0 ?: var ## _ids->devicetype, \
.driver.owner = THIS_MODULE, \
.ids = var ## _ids, ## methods \
}
static inline struct xenbus_driver *to_xenbus_driver(struct device_driver *drv)
{
return container_of(drv, struct xenbus_driver, driver);
}
int __must_check __xenbus_register_frontend(struct xenbus_driver *drv,
struct module *owner,
const char *mod_name);
static inline int __must_check
xenbus_register_frontend(struct xenbus_driver *drv)
{
WARN_ON(drv->owner != THIS_MODULE);
return __xenbus_register_frontend(drv, THIS_MODULE, KBUILD_MODNAME);
}
int __must_check __xenbus_register_backend(struct xenbus_driver *drv,
struct module *owner,
const char *mod_name);
static inline int __must_check
xenbus_register_backend(struct xenbus_driver *drv)
{
WARN_ON(drv->owner != THIS_MODULE);
return __xenbus_register_backend(drv, THIS_MODULE, KBUILD_MODNAME);
}
int __must_check xenbus_register_frontend(struct xenbus_driver *);
int __must_check xenbus_register_backend(struct xenbus_driver *);
void xenbus_unregister_driver(struct xenbus_driver *drv);