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Commit e467b642 authored by Ohad Ben-Cohen's avatar Ohad Ben-Cohen
Browse files

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: default avatarOhad Ben-Cohen <ohad@wizery.com>
parent 315d8f5c

Documentation/hwspinlock.txt

+2 −4
Original line number Diff line number Diff line
@@ -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

drivers/hwspinlock/hwspinlock_core.c

+2 −2
Original line number Diff line number Diff line
@@ -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);

drivers/hwspinlock/hwspinlock_internal.h

+1 −3
Original line number Diff line number Diff line
@@ -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 */

drivers/hwspinlock/omap_hwspinlock.c

+1 −1
Original line number Diff line number Diff line
@@ -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,

	},

};