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hwspinlock/omap: simplify allocation scheme

Browse Source 
Instead of allocating every hwspinlock separately, allocate
them all in one shot.

This both simplifies the driver and helps achieving better
slab utilization.

Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
This commit is contained in:
Ohad Ben-Cohen 2011-09-05 17:30:34 +03:00
parent e467b64214
commit c97f6dd0fe
1 changed files with 17 additions and 34 deletions
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51
drivers/hwspinlock/omap_hwspinlock.c
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@ -52,6 +52,7 @@ struct omap_hwspinlock {
struct omap_hwspinlock_state {
int num_locks; /* Total number of locks in system */
void __iomem *io_base; /* Mapped base address */
struct omap_hwspinlock lock[0]; /* Array of 'num_locks' locks */
};
static int omap_hwspinlock_trylock(struct hwspinlock *lock)
@ -95,7 +96,6 @@ static int __devinit omap_hwspinlock_probe(struct platform_device *pdev)
{
struct omap_hwspinlock *omap_lock;
struct omap_hwspinlock_state *state;
struct hwspinlock *lock;
struct resource *res;
void __iomem *io_base;
int i, ret;
@ -104,15 +104,9 @@ static int __devinit omap_hwspinlock_probe(struct platform_device *pdev)
if (!res)
return -ENODEV;
state = kzalloc(sizeof(*state), GFP_KERNEL);
if (!state)
return -ENOMEM;
io_base = ioremap(res->start, resource_size(res));
if (!io_base) {
ret = -ENOMEM;
goto free_state;
}
if (!io_base)
return -ENOMEM;
/* Determine number of locks */
i = readl(io_base + SYSSTATUS_OFFSET);
@ -124,7 +118,15 @@ static int __devinit omap_hwspinlock_probe(struct platform_device *pdev)
goto iounmap_base;
}
state->num_locks = i * 32;
i *= 32; /* actual number of locks in this device */
state = kzalloc(sizeof(*state) + i * sizeof(*omap_lock), GFP_KERNEL);
if (!state) {
ret = -ENOMEM;
goto iounmap_base;
}
state->num_locks = i;
state->io_base = io_base;
platform_set_drvdata(pdev, state);
@ -136,11 +138,7 @@ static int __devinit omap_hwspinlock_probe(struct platform_device *pdev)
pm_runtime_enable(&pdev->dev);
for (i = 0; i < state->num_locks; i++) {
omap_lock = kzalloc(sizeof(*omap_lock), GFP_KERNEL);
if (!omap_lock) {
ret = -ENOMEM;
goto free_locks;
}
omap_lock = &state->lock[i];
omap_lock->lock.dev = &pdev->dev;
omap_lock->lock.id = i;
@ -148,30 +146,19 @@ static int __devinit omap_hwspinlock_probe(struct platform_device *pdev)
omap_lock->addr = io_base + LOCK_BASE_OFFSET + sizeof(u32) * i;
ret = hwspin_lock_register(&omap_lock->lock);
if (ret) {
kfree(omap_lock);
if (ret)
goto free_locks;
}
}
return 0;
free_locks:
while (--i >= 0) {
lock = hwspin_lock_unregister(i);
/* this should't happen, but let's give our best effort */
if (!lock) {
dev_err(&pdev->dev, "%s: cleanups failed\n", __func__);
continue;
}
omap_lock = to_omap_hwspinlock(lock);
kfree(omap_lock);
}
while (--i >= 0)
hwspin_lock_unregister(i);
pm_runtime_disable(&pdev->dev);
kfree(state);
iounmap_base:
iounmap(io_base);
free_state:
kfree(state);
return ret;
}
@ -179,7 +166,6 @@ static int omap_hwspinlock_remove(struct platform_device *pdev)
{
struct omap_hwspinlock_state *state = platform_get_drvdata(pdev);
struct hwspinlock *lock;
struct omap_hwspinlock *omap_lock;
int i;
for (i = 0; i < state->num_locks; i++) {
@ -190,9 +176,6 @@ static int omap_hwspinlock_remove(struct platform_device *pdev)
dev_err(&pdev->dev, "%s: failed on %d\n", __func__, i);
return -EBUSY;
}
omap_lock = to_omap_hwspinlock(lock);
kfree(omap_lock);
}
pm_runtime_disable(&pdev->dev);