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hwspinlock/core: simplify 'owner' handling 

Use struct device_driver's owner member instead of asking drivers to
explicitly pass the owner again.

This simplifies drivers and also save some memory, since there's no
point now in maintaining a separate owner pointer per hwspinlock.

Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
This commit is contained in:
Ohad Ben-Cohen 2011-09-05 16:42:36 +03:00
parent 315d8f5ccd
commit e467b64214
4 changed files with 6 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
Documentation/hwspinlock.txt
View File

@ -256,18 +256,16 @@ underlying hwspinlock implementation using the hwspin_lock_register() API.
* @ops: vendor-specific hwspinlock handlers
* @id: a global, unique, system-wide, index of the lock.
* @lock: initialized and used by hwspinlock core
* @owner: underlying implementation module, used to maintain module ref count
*/
struct hwspinlock {
struct device *dev;
const struct hwspinlock_ops *ops;
int id;
spinlock_t lock;
struct module *owner;
};
The underlying implementation is responsible to assign the dev, ops, id and
owner members. The lock member, OTOH, is initialized and used by the hwspinlock
The underlying implementation is responsible to assign the dev, ops and id
members. The lock member, OTOH, is initialized and used by the hwspinlock
core.
6. Implementation callbacks

4
drivers/hwspinlock/hwspinlock_core.c
View File

@ -352,7 +352,7 @@ static int __hwspin_lock_request(struct hwspinlock *hwlock)
int ret;
/* prevent underlying implementation from being removed */
if (!try_module_get(hwlock->owner)) {
if (!try_module_get(hwlock->dev->driver->owner)) {
dev_err(hwlock->dev, "%s: can't get owner\n", __func__);
return -EINVAL;
}
@ -535,7 +535,7 @@ int hwspin_lock_free(struct hwspinlock *hwlock)
/* sanity check (this shouldn't happen) */
WARN_ON(tmp != hwlock);
module_put(hwlock->owner);
module_put(hwlock->dev->driver->owner);
out:
spin_unlock(&hwspinlock_tree_lock);

4
drivers/hwspinlock/hwspinlock_internal.h
View File

@ -44,10 +44,9 @@ struct hwspinlock_ops {
* @ops: platform-specific hwspinlock handlers
* @id: a global, unique, system-wide, index of the lock.
* @lock: initialized and used by hwspinlock core
* @owner: underlying implementation module, used to maintain module ref count
*
* Note: currently simplicity was opted for, but later we can squeeze some
* memory bytes by grouping the dev, ops and owner members in a single
* memory bytes by grouping dev, ops in a single
* per-platform struct, and have all hwspinlocks point at it.
*/
struct hwspinlock {
@ -55,7 +54,6 @@ struct hwspinlock {
const struct hwspinlock_ops *ops;
int id;
spinlock_t lock;
struct module *owner;
};
#endif /* __HWSPINLOCK_HWSPINLOCK_H */

2
drivers/hwspinlock/omap_hwspinlock.c
View File

@ -143,7 +143,6 @@ static int __devinit omap_hwspinlock_probe(struct platform_device *pdev)
}
omap_lock->lock.dev = &pdev->dev;
omap_lock->lock.owner = THIS_MODULE;
omap_lock->lock.id = i;
omap_lock->lock.ops = &omap_hwspinlock_ops;
omap_lock->addr = io_base + LOCK_BASE_OFFSET + sizeof(u32) * i;
@ -208,6 +207,7 @@ static struct platform_driver omap_hwspinlock_driver = {
.remove = omap_hwspinlock_remove,
.driver = {
.name = "omap_hwspinlock",
.owner = THIS_MODULE,
},
};